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the qcd axion is expected to form dense structures known as axion miniclusters if the peccei-quinn symmetry is broken after inflation. miniclusters that have survived until today will interact with neutron stars (nss) in the milky way to produce transient radio signals from axion-photon conversion in the ns magnetosphe... | transient radio signatures from neutron star encounters with qcd axion miniclusters |
the preliminary detections of the gamma-ray burst 221009a up to 18 tev by lhaaso and up to 251 tev by carpet 2 have been reported through astronomer's telegrams and gamma-ray coordination network circulars. since this burst is at redshift z = 0.1505, these photons may at first seem to have a low probability to avoid pa... | possible evidence for lorentz invariance violation in gamma-ray burst 221009a |
thanks to unparalleled near-horizon images of the shadows of messier 87* (m87*) and sagittarius a* (sgr a*) delivered by the event horizon telescope (eht), two amazing windows opened up to us for the strong-field test of the gravity theories as well as fundamental physics. information recently published from eht about ... | probing lorentz symmetry violation using the first image of sagittarius a*: constraints on standard-model extension coefficients |
we present a detailed study of the nuclear star clusters (nscs) and massive black holes (bhs) of four of the nearest low-mass early-type galaxies: m32, ngc 205, ngc 5102, and ngc 5206. we measure the dynamical masses of both the bhs and nscs in these galaxies using gemini/nifs or vlt/sinfoni stellar kinematics, hubble ... | nearby early-type galactic nuclei at high resolution: dynamical black hole and nuclear star cluster mass measurements |
we study the phenomenon of jet quenching utilizing quark and gluon jet substructures as independent probes of heavy ion collisions. we exploit jet and subjet features to highlight differences between quark and gluon jets in vacuum and in a medium with the jet-quenching model implemented in jewel. we begin with a physic... | probing heavy ion collisions using quark and gluon jet substructure |
lofar is the low-frequency radio interferometer array located at midlatitude (52°53'n). here we present results on ionospheric structures derived from 29 lofar nighttime observations during the winters of 2012/2013 and 2013/2014. we show that lofar is able to determine differential ionospheric total electron content va... | probing ionospheric structures using the lofar radio telescope |
we report the discovery of diffuse extended lyα emission from redshift 3.1 to 4.5, tracing cosmic web filaments on scales of 2.5−4 cmpc. these structures have been observed in overdensities of lyα emitters in the muse extremely deep field, a 140 h deep muse observation located in the hubble ultra-deep field. among the ... | the muse extremely deep field: the cosmic web in emission at high redshift |
in anticipation of the new era of high-redshift exploration marked by the commissioning of the james webb space telescope (jwst), we present two sets of galaxy catalogues that are designed to aid the planning and interpretation of observing programs. we provide a set of 40 wide-field light-cones with footprints spannin... | semi-analytic forecasts for jwst - vi. simulated light-cones and galaxy clustering predictions |
we present cosmological constraints from the analysis of two-point correlation functions between galaxy positions and galaxy lensing measured in dark energy survey (des) year 3 data and measurements of cosmic microwave background (cmb) lensing from the south pole telescope (spt) and planck. when jointly analyzing the d... | joint analysis of dark energy survey year 3 data and cmb lensing from spt and planck. iii. combined cosmological constraints |
the possible existence of primordial black holes in the stellar-mass window has received considerable attention because their mergers may contribute to current and future gravitational-wave detections. primordial black hole mergers, together with mergers of black holes originating from population iii stars, are expecte... | constraining high-redshift stellar-mass primordial black holes with next-generation ground-based gravitational-wave detectors |
in the past decade icecube's observations have revealed a flux of astrophysical neutrinos extending to 107 gev . the forthcoming generation of neutrino observatories promises to grant further insight into the high-energy neutrino sky, with sensitivity reaching energies up to 1012 gev . at such high energies, a new set ... | taurunner: a public python program to propagate neutral and charged leptons |
we present gigantes, the most extensive and realistic void catalog suite ever released-containing over 1 billion cosmic voids covering a volume larger than the observable universe, more than 20 tb of data, and created by running the void finder vide on quijote's halo simulations. the gigantes suite, spanning thousands ... | the gigantes data set: precision cosmology from voids in the machine-learning era |
we present the results of a chandra x-ray survey of the eight most massive galaxy clusters at z > 1.2 in the south pole telescope 2500 deg2 survey. we combine this sample with previously published chandra observations of 49 massive x-ray-selected clusters at 0 < z < 0.1 and 90 sunyaev-zel’dovich-selected clust... | the remarkable similarity of massive galaxy clusters from z ∼ 0 to z ∼ 1.9 |
we introduce the southern stellar stream spectroscopy survey (s5), an on-going program to map the kinematics and chemistry of stellar streams in the southern hemisphere. the initial focus of s5 has been spectroscopic observations of recently identified streams within the footprint of the dark energy survey (des), with ... | the southern stellar stream spectroscopic survey (s5): overview, target selection, data reduction, validation, and early science |
frb 20121102a is the first known fast radio burst (frb) from which repeat bursts were detected, and one of the best-studied frb sources in the literature. here we report on the analysis of 478 bursts (333 previously unreported) from frb 20121102a using the 305-m arecibo telescope - detected during approximately 59 hour... | arecibo observations of a burst storm from frb 20121102a in 2016 |
hot, ionized gas leaves an imprint on the cosmic microwave background via the thermal sunyaev-zel'dovich (tsz) effect. the cross-correlation of gravitational lensing (which traces the projected mass) with the tsz effect (which traces the projected gas pressure) is a powerful probe of the thermal state of ionized baryon... | cross-correlation of dark energy survey year 3 lensing data with act and p l a n c k thermal sunyaev-zel'dovich effect observations. ii. modeling and constraints on halo pressure profiles |
we consider a multicomponent dark matter model where the dark sector contains a scalar doublet and a complex scalar singlet. we impose a discrete z4 symmetry to ensure such that the lightest component of the doublet, a ∼, and the singlet, s ∼, are both stable. interactions between the dark sectors impact significantly ... | two dark matter candidates: the case of inert doublet and singlet scalars |
we present time-resolved 10.4 m gran telescopio canarias and 4.2 m william herschel telescope intermediate resolution spectroscopy of the x-ray transient maxi j1820+070 (=asassn-18ey) obtained during its decline to the quiescent state. cross-correlation of the 21 individual spectra against late-type templates reveals a... | dynamical confirmation of a black hole in maxi j1820+070 |
we present the first results from the ongoing lyman alpha galaxies in the epoch of reionization (lager) project, which is the largest narrowband survey for z ∼ 7 galaxies to date. using a specially built narrowband filter nb964 for the superb large-area dark energy camera (decam) on the noao/ctio 4 m blanco telescope, ... | first results from the lyman alpha galaxies in the epoch of reionization (lager) survey: cosmological reionization at z ∼ 7 |
we perform a joint analysis of the counts of redmapper clusters selected from the dark energy survey (des) year 1 data and multiwavelength follow-up data collected within the 2500 deg2 south pole telescope (spt) sunyaev-zel'dovich (sz) survey. the spt follow-up data, calibrating the richness-mass relation of the optica... | cosmological constraints from des y1 cluster abundances and spt multiwavelength data |
the sedigism (structure, excitation and dynamics of the inner galactic interstellar medium) survey used the apex telescope to map 84 deg2 of the galactic plane between ℓ = -60° and +31° in several molecular transitions, including 13co (2 - 1) and c18o (2 - 1), thus probing the moderately dense (∼103 cm-3) component of ... | the sedigism survey: first data release and overview of the galactic structure |
aims: the erosita final equatorial-depth survey (efeds), executed during the performance verification phase of the spectrum-roentgen-gamma (srg)/erosita telescope, was completed in november 2019. one of the science goals of this survey is to demonstrate the ability of erosita to detect samples of clusters and groups at... | the erosita final equatorial-depth survey (efeds). galaxy clusters and groups in disguise |
a promising probe to unmask particle dark matter is to observe its effect on neutron stars, the prospects of which depend critically on whether captured dark matter thermalizes in a timely manner with the stellar core via repeated scattering with the fermi-degenerate medium. in this work we estimate the timescales for ... | observing the thermalization of dark matter in neutron stars |
the detection of structures in the sky with optical surface brightnesses fainter than 30 mag arcsec-2 (3σ in 10 × 10 arcsec boxes; r-band) has remained elusive in current photometric deep surveys. here we show how present-day telescopes of 10 m class can provide broadband imaging 1.5-2 mag deeper than most previous res... | beyond 31 mag arcsec-2: the frontier of low surface brightness imaging with the largest optical telescopes |
we study the evolution of the star formation rate (sfr) - stellar mass (m⋆) relation and specific star formation rate (ssfr) of star-forming galaxies (sfgs) since a redshift z ≃ 5.5 using 2435 (4531) galaxies with highly reliable spectroscopic redshifts in the vimos ultra-deep survey (vuds). it is the first time that t... | the evolving star formation rate: m⋆ relation and ssfr since z ≃ 5 from the vuds spectroscopic survey |
dwarf spheroidal (dsph) galaxies are prime targets for present and future γ-ray telescopes hunting for indirect signals of particle dark matter. the interpretation of the data requires careful assessment of their dark matter content in order to derive robust constraints on candidate relic particles. here, we use an opt... | dark matter annihilation and decay in dwarf spheroidal galaxies: the classical and ultrafaint dsphs |
aims: although the time of the maunder minimum (1645-1715) is widely known as a period of extremely low solar activity, it is still being debated whether solar activity during that period might have been moderate or even higher than the current solar cycle #24. we have revisited all existing evidence and datasets, both... | the maunder minimum (1645-1715) was indeed a grand minimum: a reassessment of multiple datasets |
we report a b -mode power spectrum measurement from the cosmic microwave background (cmb) polarization anisotropy observations made using the sptpol instrument on the south pole telescope. this work uses 500 deg2 of sptpol data, a five-fold increase over the last sptpol b -mode release. as a result, the bandpower uncer... | measurements of b -mode polarization of the cosmic microwave background from 500 square degrees of sptpol data |
we report on a campaign on the bright black hole x-ray binary swift j1727.8$-$1613 centered around five observations by the imaging x-ray polarimetry explorer (ixpe). this is the first time it has been possible to trace the evolution of the x-ray polarization of a black hole x-ray binary across a hard to soft state tra... | tracking the x-ray polarization of the black hole transient swift j1727.8-1613 during a state transition |
we present 0"2 resolution atacama large millimeter/submillimeter array (alma) observations at 870 μm in a stellar mass-selected sample of 85 massive ( ${m}_{\star }\gt {10}^{11}\,{m}_{\odot }$ ) star-forming galaxies (sfgs) at $z=1.9\mbox{--}2.6$ in the candels/3d-hubble space telescope fields of uds and goods-s. we me... | structural evolution in massive galaxies at z ∼ 2 |
we present the first event-horizon-scale images and spatiotemporal analysis of sgr a* taken with the event horizon telescope in 2017 april at a wavelength of 1.3 mm. imaging of sgr a* has been conducted through surveys over a wide range of imaging assumptions using the classical clean algorithm, regularized maximum lik... | first sagittarius a* event horizon telescope results. iii: imaging of the galactic center supermassive black hole |
we present a systematic search of candidate galaxies at z > 11.3 using the public near infrared camera data taken by the james webb space telescope (jwst) in its cycle 1, which include six blank fields totalling 386 sq.arcmin and two lensing cluster fields totalling 48 sq.arcmin. the candidates are selected as f150w... | candidate galaxies at z ~ 11.3--21.8 and beyond: results from jwst's public data taken in its first year |
we report the discovery of two ultra-faint dwarf galaxies, leo m and leo k, that lie outside the halo of the milky way. using hubble space telescope imaging of the resolved stars, we create color-magnitude diagrams reaching the old main sequence turn-off of each system and (i) fit for structural parameters of the galax... | discovery and characterization of two ultra faint-dwarfs outside the halo of the milky way: leo m and leo k |
we develop a python tool to estimate the tail distribution of the number of dark matter halos beyond a mass threshold and in a given volume in a light-cone. the code is based on the extended press-schechter model and is computationally efficient, typically taking a few seconds on a personal laptop for a given set of co... | quantifying the tension between cosmological models and jwst red candidate massive galaxies |
we analyze a cosmological model featuring an interaction between dark energy and dark matter in light of the measurements of the cosmic microwave background released by three independent experiments: the most recent data by the planck satellite and the atacama cosmology telescope, and wmap (9-year data). we show that d... | a consistent view of interacting dark energy from multiple cmb probes |
we perform a markov chain monte carlo analysis of a simple yet generic multifield inflation model characterized by two scalar fields coupled to each other and nonminimally coupled to gravity, fit to planck 2018 cosmic microwave background (cmb) data. in particular, model parameters are constrained by data on the amplit... | planck constraints and gravitational wave forecasts for primordial black hole dark matter seeded by multifield inflation |
the fast radio burst (frb) population is observationally divided into sources that have been observed to repeat and those that have not. there is tentative evidence that the bursts from repeating sources have different properties than the non-repeating ones. in order to determine the occurrence rate of repeating source... | extremely band-limited repetition from a fast radio burst source |
the sino-french space mission svom is mainly designed to detect, localize and follow-up gamma-ray bursts and other high-energy transients. the satellite, to be launched mid 2023, embarks two wide-field gamma-ray instruments and two narrow-field telescopes operating at x-ray and optical wavelengths. it is complemented b... | the svom mission |
gw170817 and its associated electromagnetic counterpart at2017gfo continue to be a treasure trove as observations and modeling continue. recent precision astrometry of at2017gfo with the hubble space telescope combined with previous constraints from very long baseline interferometry (vlbi) constraints narrowed down the... | chemical distribution of the dynamical ejecta in the neutron star merger gw170817 |
a lidar technique has been proposed and demonstrated for remotely sensing particulate beam attenuation coefficient (cp) profiles using the raman backscattered signal from water. in raman lidar, the backscatter coefficient at 180° can be considered constant, allowing for the determination of the lidar attenuation coeffi... | sensing the profile of particulate beam attenuation coefficient through a single-photon oceanic raman lidar |
the detection of oil in water is of great importance for maintaining subsurface infrastructures such as oil pipelines. as a potential technology for oceanic application, an oceanic lidar has proved its advantages for remote sensing of optical properties and subsea materials. however, current oceanic lidar systems are h... | remote sensing oil in water with an all-fiber underwater single-photon raman lidar |
we present a new high-precision, jwst-based, strong-lensing model for the galaxy cluster abell 2744 at z = 0.3072. by combining the deep, high-resolution jwst imaging from the grism lens amplified survey from space-jwst and ultradeep nirspec and nircam observations before the epoch of reionization programs and a direct... | the glass-jwst early release science program. iii. strong-lensing model of abell 2744 and its infalling regions |
sagittarius a* (sgr a*) is the variable radio, near-infrared (nir), and x-ray source associated with accretion onto the galactic center black hole. we present an analysis of the most comprehensive nir variability data set of sgr a* to date: eight 24 hr epochs of continuous monitoring of sgr a* at 4.5 μm with the irac i... | variability timescale and spectral index of sgr a* in the near infrared: approximate bayesian computation analysis of the variability of the closest supermassive black hole |
the ligo observatories can potentially detect stochastic gravitational waves arising from phase transitions which happened in the early universe at temperatures around t ∼ 108 gev. this provides an extraordinary opportunity for discovering the phase transition associated with the breaking of the peccei-quinn symmetry, ... | peccei-quinn phase transition at ligo |
it has been suggested that radio telescopes may be sensitive to axion dark matter that resonantly converts to radio photons in the magnetospheres surrounding neutron stars (nss). in this work, we closely examine this possibility by calculating the radiated power from and projected sensitivity to axion dark matter conve... | detecting axion dark matter with radio lines from neutron star populations |
3c 279 is an archetypal blazar with a prominent radio jet that show broadband flux density variability across the entire electromagnetic spectrum. we use an ultra-high angular resolution technique - global very long baseline interferometry (vlbi) at 1.3 mm (230 ghz) - to resolve the innermost jet of 3c 279 in order to ... | event horizon telescope imaging of the archetypal blazar 3c 279 at an extreme 20 microarcsecond resolution |
we study galactic star formation activity as a function of environment and stellar mass over 0.5 < z < 2.0 using the fourstar galaxy evolution (zfourge) survey. we estimate the galaxy environment using a bayesian-motivated measure of the distance to the third nearest neighbor for galaxies to the stellar mass comp... | effect of local environment and stellar mass on galaxy quenching and morphology at 0.5 < z < 2.0 |
the complete calibration of the color-redshift relation (c3r2) survey is a multi-institution, multi-instrument survey that aims to map the empirical relation of galaxy color to redshift to i ∼ 24.5 (ab), thereby providing a firm foundation for weak lensing cosmology with the stage iv dark energy missions euclid and wfi... | the complete calibration of the color-redshift relation (c3r2) survey: analysis and data release 2 |
we undertook coordinated campaigns with the green bank, effelsberg, and arecibo radio telescopes during chandra x-ray observatory and xmm-newton observations of the repeating fast radio burst frb 121102 to search for simultaneous radio and x-ray bursts. we find 12 radio bursts from frb 121102 during 70 ks total of x-ra... | simultaneous x-ray, gamma-ray, and radio observations of the repeating fast radio burst frb 121102 |
we describe the outer rim cosmological simulation, one of the largest high-resolution n-body simulations performed to date, aimed at promoting science to be carried out with large-scale structure surveys. the simulation covers a volume of (4.225 gpc)3 and evolves more than one trillion particles. it was executed on mir... | the outer rim simulation: a path to many-core supercomputers |
context. the effelsberg-bonn h i survey (ebhis) is a new 21-cm survey performed with the 100-m telescope at effelsberg. it covers the whole northern sky out to a redshift of z ~ 0.07 and comprises h i line emission from the milky way and the local volume.aims: we aim to substitute the northern-hemisphere part of the le... | the effelsberg-bonn h i survey: milky way gas. first data release |
the direct detection of a bright, ring-like structure in horizon-resolving images of m87* by the event horizon telescope (eht) is a striking validation of general relativity. the angular size and shape of the ring is a degenerate measure of the location of the emission region, mass, and spin of the black hole. however,... | measuring spin from relative photon-ring sizes |
the gaia sausage (gs) and the sequoia represent the major accretion events that formed the stellar halo of the milky way. a detailed chemical study of these main building blocks provides a pristine view of the early steps of the galaxy's assembly. we present the results of the analysis of the uves high-resolution spect... | elevated r-process enrichment in gaia sausage and sequoia |
stringent observational constraints on the subgalactic matter power spectrum would allow one to distinguish between the concordance λcdm and the various alternative dark-matter models that predict significantly different properties of mass structure in galactic haloes. galaxy-galaxy strong gravitational lensing provide... | probing sub-galactic mass structure with the power spectrum of surface-brightness anomalies in high-resolution observations of galaxy-galaxy strong gravitational lenses. ii. observational constraints on the subgalactic matter power spectrum |
the compton spectrometer and imager (cosi) is a 0.2-5 mev compton telescope capable of imaging, spectroscopy, and polarimetry of astrophysical sources. such capabilities are made possible by cosi's germanium cross-strip detectors, which provide high efficiency, high resolution spectroscopy and precise 3d positioning of... | the compton spectrometer and imager project for mev astronomy |
primordial black holes (pbhs) are dark matter candidates that span broad mass ranges from 10-17 m⊙ to ~100 m⊙. we show that the stochastic gravitational wave background can be a powerful window for the detection of subsolar mass pbhs and shed light on their formation channel via third-generation gravitational wave dete... | prospects of discovering subsolar primordial black holes using the stochastic gravitational wave background from third-generation detectors |
we examine the level of agreement between low-redshift weak lensing data and the cosmic microwave background using measurements from the canada-france-hawaii telescope lensing survey (cfhtlens) and planck+wilkinson microwave anisotropy probe (wmap) polarization. we perform an independent analysis of the cfhtlens six bi... | cosmic discordance: are planck cmb and cfhtlens weak lensing measurements out of tune? |
the collapse of astrophysically significant bodies generates, under suitable conditions, black holes. since one expects the generator of the black hole to be a rotating body, the black hole will also rotate. the existence of inner singularities in classical solutions for rotating black holes and the fact that general r... | regular rotating black holes: a review |
we present observations of q1549-c25, an ∼ {l}*star-forming galaxy at z = 3.15 for which lyman-continuum (lyc) radiation is significantly detected in deep keck/lris spectroscopy. we find no evidence of contamination from a lower-redshift interloper close to the line of sight in the high signal-to-noise spectrum of q154... | q1549-c25: a clean source of lyman-continuum emission at z = 3.15 |
understanding the formation of relativistic jets in active galactic nuclei remains an elusive problem1. this is partly because observational tests of jet formation models suffer from the limited angular resolution of ground-based very-long-baseline interferometry that has thus far been able to probe the structure of th... | a wide and collimated radio jet in 3c84 on the scale of a few hundred gravitational radii |
black hole (bh) accretion is one of nature's most efficient energy extraction processes. when gas falls in, a significant fraction of its gravitational binding energy is either converted into radiation or flows outwards in the form of bh-driven jets and disc-driven winds. recently, the event horizon telescope (eht), an... | observational signatures of disc and jet misalignment in images of accreting black holes |
we present an overview of the gbt observations of tmc-1: hunting aromatic molecules large program on the green bank telescope. this and a related program were launched to explore the depth and breadth of aromatic chemistry in the interstellar medium at the earliest stages of star formation, following our earlier detect... | early science from gotham: project overview, methods, and the detection of interstellar propargyl cyanide (hccch2cn) in tmc-1 |
the repeating fast radio burst (frb) source frb 20200120e is exceptional because of its proximity and association with a globular cluster. here we report 60 bursts detected with the effelsberg telescope at 1.4 ghz. we observe large variations in the burst rate, and report the first frb 20200120e 'burst storm', where th... | a burst storm from the repeating frb 20200120e in an m81 globular cluster |
the blazar pks 0735+178 is possibly associated with multiple neutrino events observed by the icecube, baikal, baksan, and km3net neutrino telescopes while it was flaring in the γ-ray, x-ray, ultraviolet, and optical bands. we present a detailed study of this peculiar blazar to investigate the temporal and spectral chan... | a multimessenger study of the blazar pks 0735+178: a new major neutrino source candidate |
we report the large effort that is producing comprehensive high-level young star cluster (ysc) catalogs for a significant fraction of galaxies observed with the legacy extragalactic uv survey (legus) hubble treasury program. we present the methodology developed to extract cluster positions, verify their genuine nature,... | legacy extragalactic uv survey with the hubble space telescope: stellar cluster catalogs and first insights into cluster formation and evolution in ngc 628 |
the seyfert 1 galaxy ngc 4593 was monitored spectroscopically with the hubble space telescope as part of a reverberation mapping campaign that also included swift, kepler, and ground-based photometric monitoring. during 2016 july 12-august 6, we obtained 26 spectra across a nearly continuous wavelength range of ∼1150-1... | accretion disk reverberation with hubble space telescope observations of ngc 4593: evidence for diffuse continuum lags |
we report on results from new high-sensitivity, high-resolution 86 ghz (3.5 mm) observations of the jet base in the nearby radio galaxy m87, obtained by the very long baseline array in conjunction with the green bank telescope. the resulting image has a dynamic range exceeding 1500 to 1, the highest ever achieved for t... | high-sensitivity 86 ghz (3.5 mm) vlbi observations of m87: deep imaging of the jet base at a resolution of 10 schwarzschild radii |
an incremental version (4lac-dr2) of the fourth catalog of active galactic nuclei (agns) detected by the fermi-lat is presented. this version is associated with the second release of the 4fgl general catalog (based on 10 years of data), where the spectral parameters, spectral energy distributions, yearly light curves, ... | the fourth catalog of active galactic nuclei detected by the fermi large area telescope -- data release 2 |
modern observatories have revealed the ubiquitous presence of magnetohydrodynamic waves in the solar corona. the propagating waves (in contrast to the standing waves) are usually originated in the lower solar atmosphere which makes them particularly relevant to coronal heating. furthermore, open coronal structures are ... | magnetohydrodynamic waves in open coronal structures |
massive colliding-wind binaries that host a wolf-rayet (wr) star present a potentially important source of dust and chemical enrichment in the interstellar medium. however, the chemical composition and survival of dust formed from such systems is not well understood. the carbon-rich wolf-rayet binary wr 140 presents an... | nested dust shells around the wolf-rayet binary wr 140 observed with jwst |
we report the discovery and constrain the physical conditions of the interstellar medium of the highest-redshift millimeter-selected dusty star-forming galaxy to date, spt-s j031132-5823.4 (hereafter spt0311-58), at z=6.900+/- 0.002. spt0311-58 was discovered via its 1.4 mm thermal dust continuum emission in the south ... | ism properties of a massive dusty star-forming galaxy discovered at z ∼ 7 |
neutron stars serve as excellent next-generation thermal detectors of dark matter, heated by the scattering and annihilation of dark matter accelerated to relativistic speeds in their deep gravitational wells. however, the dynamics of neutron star cores are uncertain, making it difficult at present to unequivocally com... | warming nuclear pasta with dark matter: kinetic and annihilation heating of neutron star crusts |
we show that the ratio of galaxies' specific star formation rates (ssfrs) to their host halos' specific mass accretion rates (smars) strongly constrains how the galaxies' stellar masses, ssfrs, and host halo masses evolve over cosmic time. this evolutionary constraint provides a simple way to probe z > 8 galaxy popu... | a simple technique for predicting high-redshift galaxy evolution |
we investigate the impact and mitigation of extragalactic foregrounds for the cmb lensing power spectrum analysis of atacama cosmology telescope (act) data release 6 (dr6) data. two independent microwave sky simulations are used to test a range of mitigation strategies. we demonstrate that finding and then subtracting ... | the atacama cosmology telescope: mitigating the impact of extragalactic foregrounds for the dr6 cmb lensing analysis |
reionization is thought to have occurred in the redshift range of 6 < z < 9, which is now being probed by both deep galaxy surveys and cmb observations. using halo abundance matching over the redshift range 5 < z < 8 and assuming smooth, continuous gas accretion, we develop a model for the star formation ef... | constraints on the star formation efficiency of galaxies during the epoch of reionization |
gamma-ray bursts (grbs) have long been considered a possible source of high-energy neutrinos. while no correlations have yet been detected between high-energy neutrinos and grbs, the recent observation of grb 221009a-the brightest grb observed by fermi-gbm to date and the first one to be observed above an energy of 10 ... | limits on neutrino emission from grb 221009a from mev to pev using the icecube neutrino observatory |
isolated ideal neutron stars (ns) of age >109 yr exhaust thermal and rotational energies and cool down to temperatures below o (100 ) k . accretion of particle dark matter (dm) by such ns can heat them up through kinetic and annihilation processes. this increases the ns surface temperature to a maximum of ∼2550 k in... | faint light of old neutron stars and detectability at the james webb space telescope |
cross-correlations of galaxy positions and galaxy shears with maps of gravitational lensing of the cosmic microwave background (cmb) are sensitive to the distribution of large-scale structure in the universe. such cross-correlations are also expected to be immune to some of the systematic effects that complicate correl... | joint analysis of dark energy survey year 3 data and cmb lensing from spt and p l a n c k . ii. cross-correlation measurements and cosmological constraints |
in this paper, we present the results from spectroscopic and photometric observations of the m-type flare star yz cmi in the framework of the optical and infrared synergetic telescopes for education and research (oister) collaborations during the transiting exoplanet survey satellite (tess) observation period. we detec... | time-resolved spectroscopy and photometry of m dwarf flare star yz canis minoris with oister and tess: blue asymmetry in the hα line during the non-white light flare |
we use the fisher information matrix to investigate the angular resolution and luminosity distance uncertainty for coalescing binary neutron stars (bnss) and neutron star-black hole binaries (nsbhs) detected by the third-generation (3g) gravitational-wave (gw) detectors. our study focuses on an individual 3g detector a... | localization accuracy of compact binary coalescences detected by the third-generation gravitational-wave detectors and implication for cosmology |
we determine the magnetic field strength in the omc 1 region of the orion a filament via a new implementation of the chandrasekhar-fermi method using observations performed as part of the james clerk maxwell telescope (jcmt) b-fields in star-forming region observations (bistro) survey with the pol-2 instrument. we comb... | the jcmt bistro survey: the magnetic field strength in the orion a filament |
the fraction of ionizing photons that escape high-redshift galaxies sensitively determines whether galaxies reionized the early universe. however, this escape fraction cannot be measured from high-redshift galaxies because the opacity of the intergalactic medium is large at high redshifts. without methods to measure th... | accurately predicting the escape fraction of ionizing photons using rest-frame ultraviolet absorption lines |
aims: we present a new upgraded version of ares. the new version includes a series of interesting new features such as automatic radial velocity correction, a fully automatic continuum determination, and an estimation of the errors for the equivalent widths.methods: the automatic correction of the radial velocity is ac... | ares v2: new features and improved performance |
kinetic sunyaev zel'dovich (ksz) tomography provides a powerful probe of the radial velocity field of matter in the universe. by cross-correlating a high resolution cosmic microwave background (cmb) experiment like cmb-s4 and a galaxy survey like dark energy spectroscopic instrument (desi) or large synoptic survey tele... | constraining local non-gaussianities with kinetic sunyaev-zel'dovich tomography |
thanks for the releasing image of supermassive black holes (bhs) by the event horizon telescope (eht) at the heart of the m87 galaxy. after the discovery of this mysterious object, scientists paid attention to exploring the bh shadow features under different gravitational backgrounds. in this scenario, we study the lig... | the optical appearance of charged four-dimensional gauss-bonnet black hole with strings cloud and non-commutative geometry surrounded by various accretions profiles |
we present an updated data-analysis comparison of the most recent observations of the cosmic microwave background temperature anisotropies and polarization angular power spectra released by four different experiments: the planck satellite on one side, and the atacama cosmology telescope (actpol) and the south pole tele... | health checkup test of the standard cosmological model in view of recent cosmic microwave background anisotropies experiments |
we report a measurement of the power spectrum of cosmic microwave background (cmb) lensing from two seasons of atacama cosmology telescope polarimeter (actpol) cmb data. the cmb lensing power spectrum is extracted from both temperature and polarization data using quadratic estimators. we obtain results that are consist... | two-season atacama cosmology telescope polarimeter lensing power spectrum |
we propose simple scenarios where lepton flavor-violating couplings generate the observed dark matter abundance through freeze-in of an axion-like particle with mass in the few kev range. compared to flavor-diagonal freeze-in, this mechanism enhances dark matter stability, softens stellar cooling constraints and improv... | axion dark matter from lepton flavor-violating decays |
the panoramic imaging survey of centaurus and sculptor (pisces) is constructing a wide-field map of the resolved stellar populations in the extended halos of these two nearby, prominent galaxies. we present new magellan/megacam imaging of a ∼3 deg2 area around centaurus a (cen a), which filled in much of our coverage t... | the faint end of the centaurus a satellite luminosity function |
using radio observations with the green bank telescope, evidence has now been found for a second five-membered ring in the dense cloud taurus molecular cloud-1 (tmc-1). based on additional observations of an ongoing, large-scale, high-sensitivity spectral line survey (gotham) at centimeter wavelengths toward this sourc... | interstellar detection of 2-cyanocyclopentadiene, c5h5cn, a second five-membered ring toward tmc-1 |
we present the first results from the x-shooter lyman α survey at z = 2 (xls-z2). xls-z2 is a deep spectroscopic survey of 35 lyman α emitters (laes) utilizing ≈90 h of exposure time with very large telescope/x-shooter and covers rest-frame ly α to h α emission with r ≈ 4000. we present the sample selection, the observ... | the x-shooter lyman α survey at z = 2 (xls-z2) i: what makes a galaxy a lyman α emitter? |
we present the properties of ngc 4993, the host galaxy of gw170817, the first gravitational-wave (gw) event from the merger of a binary neutron star (bns) system and the first with an electromagnetic (em) counterpart. we use both archival photometry and new optical/near-ir imaging and spectroscopy, together with stella... | the electromagnetic counterpart of the binary neutron star merger ligo/virgo gw170817. vii. properties of the host galaxy and constraints on the merger timescale |
the structure and dynamics of the solar corona is dominated by the magnetic field. in most areas in the corona magnetic forces are so dominant that all non-magnetic forces such as plasma pressure gradients and gravity can be neglected in the lowest order. this model assumption is called the force-free field assumption,... | solar force-free magnetic fields |
we present component-separated maps of the primary cosmic microwave background/kinematic sunyaev-zel'dovich (sz) amplitude and the thermal sz compton-y parameter, created using data from the south pole telescope (spt) and the planck satellite. these maps, which cover the ~2500 deg2 of the southern sky imaged by the spt... | cmb/ksz and compton-y maps from 2500 deg2 of spt-sz and planck survey data |
we have refined the census of stars and brown dwarfs in the upper sco association (∼10 myr, ∼145 pc) by (1) updating the selection of candidate members from our previous survey to include the high-precision astrometry from the second data release of gaia, (2) obtaining spectra of a few hundred candidate members to meas... | refining the census of the upper scorpius association with gaia |
the galactic center supermassive black hole sagittarius a* (sgr a*) is one of the most promising targets to study the dynamics of black hole accretion and outflow via direct imaging with very long baseline interferometry (vlbi). at 3.5 mm (86 ghz), the emission from sgr a* is resolvable with the global millimeter vlbi ... | the size, shape, and scattering of sagittarius a* at 86 ghz: first vlbi with alma |
we present photometry and derived redshifts from up to eleven bandpasses for 9927 galaxies in the hubble ultra deep field (udf), covering an observed wavelength range from the near-ultraviolet (nuv) to the near-infrared (nir) with hubble space telescope observations. our wide field camera 3 (wfc3)/uv f225w, f275w, and ... | uvudf: ultraviolet through near-infrared catalog and photometric redshifts of galaxies in the hubble ultra deep field |
galaxies forming in low-mass haloes are thought to be primarily responsible for reionizing the universe during the first billion years after the big bang. yet, these haloes are extremely inefficient at forming stars in the nearby universe. in this work, we address this apparent tension, and ask whether a physically mot... | semi-analytic forecasts for jwst - iv. implications for cosmic reionization and lyc escape fraction |
the recent discovery of gravitational waves (gws) has opened new horizons for physics. current and upcoming missions, such as ligo, virgo, kagra, and lisa, promise to shed light on black holes of every size from stellar mass (sbh) sizes up to supermassive black holes. the intermediate-mass black hole (imbh) family has ... | gravitational waves and intermediate-mass black hole retention in globular clusters |
we present measurements of the x-ray observables of the intracluster medium (icm), including luminosity lx , icm mass m icm, emission-weighted mean temperature tx , and integrated pressure yx , that are derived from xmm-newton x-ray observations of a sunyaev-zel’dovich effect (sze) selected sample of 59 galaxy clusters... | x-ray properties of spt-selected galaxy clusters at 0.2 < z < 1.5 observed with xmm-newton |
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