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context. several recent studies have demonstrated that the galactic bulge hosts two components with different mean metallicities, and possibly different spatial distribution and kinematics. as a consequence, both the metallicity distribution and the radial velocity of bulge stars vary across different lines of sight.ai... | the giraffe inner bulge survey (gibs). iii. metallicity distributions and kinematics of 26 galactic bulge fields |
dark matter particles will be captured in neutron stars if they undergo scattering interactions with nucleons or leptons. these collisions transfer the dark matter kinetic energy to the star, resulting in appreciable heating that is potentially observable by forthcoming infrared telescopes. while previous work consider... | capture of leptophilic dark matter in neutron stars |
we present a revised and complete optical afterglow light curve of the binary neutron star merger gw170817, enabled by deep hubble space telescope (hst) f606w observations at ≈584 days post-merger, which provide a robust optical template. the light curve spans ≈110-362 days, and is fully consistent with emission from a... | the optical afterglow of gw170817: an off-axis structured jet and deep constraints on a globular cluster origin |
the merger rate of black hole binaries inferred from the detections in the first advanced ligo science run implies that a stochastic background produced by a cosmological population of mergers will likely mask the primordial gravitational wave background. here we demonstrate that the next generation of ground-based det... | digging deeper: observing primordial gravitational waves below the binary-black-hole-produced stochastic background |
we present the jwst resolved stellar populations early release science (ers) program. we obtained 27.5 hr of nircam and niriss imaging of three targets in the local group (milky way globular cluster m92, ultrafaint dwarf galaxy draco ii, and star-forming dwarf galaxy wlm), which span factors of ~105 in luminosity, ~104... | the jwst resolved stellar populations early release science program. ii. survey overview |
most existing star-galaxy classifiers use the reduced summary information from catalogues, requiring careful feature extraction and selection. the latest advances in machine learning that use deep convolutional neural networks (convnets) allow a machine to automatically learn the features directly from the data, minimi... | star-galaxy classification using deep convolutional neural networks |
we present deep james webb space telescope (jwst)/miri f560w observations of a flux-limited, alma-selected sample of 28 galaxies at z=0.5-3.6 in the hubble ultra deep field (hudf). the data from the miri deep imaging survey (midis) reveal the stellar structure of the hudf galaxies at rest-wavelengths of >1 micron fo... | midis: jwst/miri reveals the stellar structure of alma-selected galaxies in the hubble-udf at cosmic noon |
the distribution of mass in galaxy-scale strong gravitational lenses is often modelled as an elliptical power law plus 'external shear', which notionally accounts for neighbouring galaxies and cosmic shear. we show that it does not. except in a handful of rare systems, the best-fit values of external shear do not corre... | strong gravitational lensing's 'external shear' is not shear |
the event horizon telescope (eht) recently released an image of the supermassive black hole sgr a* showing an angular shadow diameter d sh = 48.7 ± 7 μas and schwarzschild shadow deviation $\delta =-{0.08}_{-0.09}^{+0.09}\,(\mathrm{vlti})$ , $-{0.04}_{-0.10}^{+0.09}\,(\mathrm{keck})$ using a black hole mass $m={4.0}_{-... | an upper limit on the charge of the black hole sgr a* from eht observations |
we search for ultra-light axions as dark matter (dm) and dark energy particle candidates, for axion masses 10-32 ev ≤ m a ≤ 10-24 ev, by a joint analysis of cosmic microwave background (cmb) and galaxy clustering data - and consider if axions can resolve the tension in inferred values of the matter clustering parameter... | ultra-light axions and the s 8 tension: joint constraints from the cosmic microwave background and galaxy clustering |
we compute the spherical-sky weak-lensing power spectrum of the shear and convergence. we discuss various approximations, such as flat-sky, and first- and second-order limber equations for the projection. we find that the impact of adopting these approximations is negligible when constraining cosmological parameters fr... | precision calculations of the cosmic shear power spectrum projection |
recent developments of transition-edge sensors (tess), based on extensive experience in ground-based experiments, have been making the sensor techniques mature enough for their application on future satellite cosmic microwave background (cmb) polarization experiments. litebird is in the most advanced phase among such f... | updated design of the cmb polarization experiment satellite litebird |
we investigate the shadow of an exact black hole solution of einstein's equations recently proposed by cardoso et al., to describe a supermassive black hole immersed in a dark matter halo. we analyze and discuss the light rings and the gravitational lensing of this spacetime comparing them with an isolated schwarzschil... | shadows of black holes with dark matter halo |
this compilation is the fourth data release from the r-process alliance (rpa) search for r-process-enhanced stars and the second release based on "snapshot" high-resolution (r ∼ 30,000) spectra collected with the du pont 2.5 m telescope. in this data release, we propose a new delineation between the r-i and r-ii stella... | the r-process alliance: fourth data release from the search for r-process-enhanced stars in the galactic halo |
x-ray reverberation echoes are assumed to be produced in the strongly distorted spacetime around accreting supermassive black holes. this signal allows us to spatially map the geometry of the inner accretion flow1,2—a region that cannot yet be spatially resolved by any telescope—and provides a direct measure of the bla... | a dynamic black hole corona in an active galaxy through x-ray reverberation mapping |
we present a new formalism designed to discover dark matter annihilation occurring in the milky way's dwarf galaxies. the statistical framework extracts all available information in the data by simultaneously combining observations of all the dwarf galaxies and incorporating the impact of particle physics properties, t... | comprehensive search for dark matter annihilation in dwarf galaxies |
the chemical abundances of spirals (chaos) project leverages the combined power of the large binocular telescope (lbt) with the broad spectral range and sensitivity of the multi object double spectrograph (mods) to measure “direct” abundances (based on observations of the temperature-sensitive auroral lines) in large s... | chaos i. direct chemical abundances for h ii regions in ngc 628 |
the high abundances of complex organic molecules (coms) with respect to methanol, the most abundant com, detected toward low-mass protostars, tend to be underpredicted by astrochemical models. this discrepancy might come from the large beam of the single-dish telescopes, encompassing several components of the studied p... | constraining the abundances of complex organics in the inner regions of solar-type protostars |
synchrotron radiation from hot gas near a black hole results in a polarized image. the image polarization is determined by effects including the orientation of the magnetic field in the emitting region, relativistic motion of the gas, strong gravitational lensing by the black hole, and parallel transport in the curved ... | the polarized image of a synchrotron-emitting ring of gas orbiting a black hole |
we report in detail on searches for ev-scale sterile neutrinos, in the context of a 3 +1 model, using eight years of data from the icecube neutrino telescope. by analyzing the reconstructed energies and zenith angles of 305,735 atmospheric νμ and ν¯μ events we construct confidence intervals in two analysis spaces: sin2... | searching for ev-scale sterile neutrinos with eight years of atmospheric neutrinos at the icecube neutrino telescope |
we evolve two high-resolution general relativistic magnetohydrodynamic simulations of advection-dominated accretion flows around nonspinning black holes (bhs), each over a duration ~3 × 105 gm bh/c 3. one model captures the evolution of a weakly magnetized (sane) disk and the other that of a magnetically arrested disk ... | flux eruption events drive angular momentum transport in magnetically arrested accretion flows |
exploiting the full statistical power of future cosmic shear surveys will necessitate improvements to the accuracy with which the gravitational lensing signal is measured. we present a framework for calibrating shear with image simulations that demonstrates the importance of including realistic correlations between gal... | towards emulating cosmic shear data: revisiting the calibration of the shear measurements for the kilo-degree survey |
we present the h i emission project within the mightee survey, currently being carried out with the newly commissioned meerkat radio telescope. this is one of the first deep, blind, medium-wide interferometric surveys for neutral hydrogen (h i) ever undertaken, extending our knowledge of h i emission to z = 0.6. the sc... | mightee-hi: the h i emission project of the meerkat mightee survey |
within the standard propagation scenario, the flavor ratios of high-energy cosmic neutrinos at neutrino telescopes are expected to be around the democratic benchmark resulting from hadronic sources, (1/3 :1 /3 :1 /3 ) ⊕. we show how the coupling of neutrinos to an ultralight dark matter complex scalar field would induc... | flavor of cosmic neutrinos preserved by ultralight dark matter |
the sensitive infrared telescopes, spitzer and herschel, have been used to target low-metallicity star-forming galaxies, allowing us to investigate the properties of their interstellar medium (ism) in unprecedented detail. interpretation of the observations in physical terms relies on careful modeling of those properti... | the herschel dwarf galaxy survey. ii. physical conditions, origin of [c ii] emission, and porosity of the multiphase low-metallicity ism |
galaxy cluster abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous mergers. we map the distribution of associated dark matter, using new hu... | the behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of abell 3827 |
the murchison widefield array is a new low-frequency interferometric radio telescope built in western australia at one of the locations of the future square kilometre array. we describe the automated radio-frequency interference detection strategy implemented for the murchison widefield array, which is based on the aof... | the low-frequency environment of the murchison widefield array: radio-frequency interference analysis and mitigation |
axion dark matter (dm) may efficiently convert to photons in the magnetospheres of neutron stars (nss), producing nearly monochromatic radio emission. this process is resonantly triggered when the plasma frequency induced by the underlying charge distribution approximately matches the axion mass. we search for evidence... | extraterrestrial axion search with the breakthrough listen galactic center survey |
context. the gas kinetic temperature (tk) determines the physical and chemical evolution of the interstellar medium (ism). however, obtaining reliable tk estimates usually requires expensive observations including the combination of multi-line analysis and dedicated radiative transfer calculations.aims: this work explo... | hcn-to-hnc intensity ratio: a new chemical thermometer for the molecular ism |
two independent groups reported the discovery of an isolated dark stellar remnant in the microlensing event ogle-2011-blg-0462 based on photometric ground-based observations coupled with astrometric measurements taken with the hubble space telescope. these two analyses yielded discrepant mass measurements, with the fir... | systematic errors as a source of mass discrepancy in black hole microlensing event ogle-2011-blg-0462 |
the existence of primordial black holes (pbhs), which may form from the collapse of matter overdensities shortly after the big bang, is still under debate. among the potential signatures of pbhs are gravitational waves (gws) emitted from binary black hole (bbh) mergers at redshifts z ≳ 30, where the formation of astrop... | on the single-event-based identification of primordial black hole mergers at cosmological distances |
the merian survey is mapping $\sim$ 850 degrees$^2$ of the hyper suprime-cam strategic survey program (hsc-ssp) wide layer with two medium-band filters on the 4-meter victor m. blanco telescope at the cerro tololo inter-american observatory, with the goal of carrying the first high signal-to-noise (s/n) measurements of... | the merian survey: design, construction, and characterization of a filter set optimized to find dwarf galaxies and measure their dark matter halo properties with weak lensing |
star-forming galaxies can exhibit strong morphological differences between the rest-frame far-uv and optical, reflecting inhomogeneities in star formation and dust attenuation. we exploit deep, high-resolution, nircam seven-band observations to take a first look at the morphology of galaxies in the epoch of reionizatio... | early results from glass-jwst. xii. the morphology of galaxies at the epoch of reionization |
we present new deep alma and hubble space telescope (hst)/wfc3 observations of masosa and vr7, two luminous lyα emitters (laes) at z = 6.5, for which the uv continuum levels differ by a factor of four. no ir dust continuum emission is detected in either, indicating little amounts of obscured star formation and/or high ... | resolved uv and [c ii] structures of luminous galaxies within the epoch of reionization |
context. massive stars are important building blocks of the universe, and their stellar structure and evolution models are fundamental cornerstones of various fields in modern astrophysics. the precision of these models is strongly limited by our lack of understanding of various internal mixing processes that significa... | signatures of internal rotation discovered in the kepler data of five slowly pulsating b stars |
we use the atacama large millimeter/submillimeter array (alma) in cycle 1 to determine spectroscopic redshifts of high-redshift dusty star-forming galaxies (dsfgs) selected by their 1.4 mm continuum emission in the south pole telescope (spt) survey. we present alma 3 mm spectral scans between 84 and 114 ghz for 15 gala... | the redshift distribution of dusty star-forming galaxies from the spt survey |
we present an improved event-level likelihood formalism for including neutrino telescope data in global fits to new physics. we derive limits on spin-dependent dark matter-proton scattering by employing the new formalism in a re-analysis of data from the 79-string icecube search for dark matter annihilation in the sun,... | improved limits on dark matter annihilation in the sun with the 79-string icecube detector and implications for supersymmetry |
in broad classes of inflationary models the period of accelerated expansion is followed by fragmentation of the inflaton scalar field into localized, long-lived, and massive oscillon excitations. we demonstrate that matter dominance of oscillons, followed by their rapid decay, significantly enhances the primordial grav... | enhanced gravitational waves from inflaton oscillons |
we consider two stable interacting dark matter-dark energy models and confront them against current cosmic microwave background data from the planck satellite. we then generate luminosity distance measurements from script o(103) mock gravitational wave events matching the expected sensitivity of the proposed einstein t... | listening to the sound of dark sector interactions with gravitational wave standard sirens |
we present weak-lensing measurements using the first-year data from the hyper suprime-cam strategic survey program on the subaru telescope for eight galaxy clusters selected through their thermal sunyaev-zel’dovich (sz) signal measured at 148 ghz with the atacama cosmology telescope polarimeter experiment. the overlap ... | weak-lensing mass calibration of actpol sunyaev-zel’dovich clusters with the hyper suprime-cam survey |
we investigate the gravitational lensing by spinning proca stars and the shadows and lensing by kerr black holes (bhs) with synchronised proca hair, discussing both theoretical aspects and observational constraints from the event horizon telescope (eht) m87* and sgr a* data. on the theoretical side, this family of bhs ... | kerr black holes with synchronised proca hair: lensing, shadows and eht constraints |
this paper presents the detailed abundances and r-process classifications of 126 newly identified metal-poor stars as part of an ongoing collaboration, the r-process alliance. the stars were identified as metal-poor candidates from the radial velocity experiment (rave) and were followed up at high spectral resolution (... | the r-process alliance: first release from the northern search for r-process-enhanced metal-poor stars in the galactic halo |
we have obtained deep hubble space telescope (hst) imaging of 19 dwarf galaxy candidates in the vicinity of m101. advanced camera for surveys hst photometry for two of these objects showed resolved stellar populations and tip of the red giant branch derived distances (d ∼ 7 mpc) consistent with m101 group membership. t... | the m101 satellite luminosity function and the halo-halo scatter among local volume hosts |
exploiting the power of gravitational lensing, the hubble frontier fields (hff) program aims at observing six massive galaxy clusters to explore the distant universe far beyond the limits of blank field surveys. using the complete hubble space telescope observations of the first hff cluster a2744, we report the detecti... | new constraints on the faint end of the uv luminosity function at z ~ 7-8 using the gravitational lensing of the hubble frontier fields cluster a2744 |
for an observer, the black hole (bh) shadow is the bhs apparent image in the sky due to the gravitational lensing of nearby radiation, emitted by an external source. a recent class of solutions dubbed kerr bhs with scalar hair possess smaller shadows than the corresponding kerr bhs and, under some conditions, novel exo... | shadows of kerr black holes with and without scalar hair |
the orbital evolution of a binary system consisting of two primordial black hole clusters is investigated. such clusters are predicted in some theoretical models with broken symmetry in the inflation lagrangian. a cluster consists of the most massive central black hole surrounded by many smaller black holes. similar to... | gravitational waves from the merger of two primordial black hole clusters |
on january 14, 2019, the major atmospheric gamma imaging cherenkov telescopes detected grb 190114c above 0.2 tev, recording the most energetic photons ever observed from a gamma-ray burst. we use this unique observation to probe an energy dependence of the speed of light in vacuo for photons as predicted by several qua... | bounds on lorentz invariance violation from magic observation of grb 190114c |
coronal mass ejections (cmes), often associated with flares1-3, are the most powerful magnetic phenomena occurring on the sun. stars show magnetic activity levels up to ten thousand times higher4, and cme effects on stellar physics and circumstellar environments are predicted to be substantial5-9. however, stellar cmes... | a stellar flare-coronal mass ejection event revealed by x-ray plasma motions |
we describe ipole, a new public ray-tracing code for covariant, polarized radiative transport. the code extends the ibothros scheme for covariant, unpolarized transport using two representations of the polarized radiation field: in the coordinate frame, it parallel transports the coherency tensor; in the frame of the p... | ipole - semi-analytic scheme for relativistic polarized radiative transport |
giant stellar clumps are ubiquitous in high-redshift galaxies1,2. they are thought to play an important role in the build-up of galactic bulges3 and as diagnostics of star formation feedback in galactic discs4. hubble space telescope (hst) blank field imaging surveys have estimated that these clumps have masses of up t... | the nature of giant clumps in distant galaxies probed by the anatomy of the cosmic snake |
we present magellan/m2fs, very large telescope/giraffe, and gemini south/gmos spectroscopy of the newly discovered milky way satellite reticulum ii. based on the spectra of 25 ret ii member stars selected from dark energy survey imaging, we measure a mean heliocentric velocity of 62.8+/- 0.5 {km} {{{s}}}-1 and a veloci... | stellar kinematics and metallicities in the ultra-faint dwarf galaxy reticulum ii |
we revisit the simplest model for dark matter. in this context the dark matter candidate is a real scalar field which interacts with the standard model particles through the higgs portal. we discuss the relic density constraints as well as the predictions for direct and indirect detection. the final state radiation pro... | scalar dark matter: direct vs. indirect detection |
the historic detection of gravitational waves from a binary neutron star merger (gw170817) and its electromagnetic counterpart led to the first accurate (sub-arcsecond) localization of a gravitational-wave event. the transient was found to be ∼10″ from the nucleus of the s0 galaxy ngc 4993. we report here the luminosit... | the distance to ngc 4993: the host galaxy of the gravitational-wave event gw170817 |
with more than 150 blank sky observations at high galactic latitude, we make a systematic study to the background of the low energy telescope (le) of the hard x-ray modulation telescope (dubbed as insight-hxmt). both the on-ground simulation and the in-orbit observation indicate that the background spectrum mainly has ... | background model for the low-energy telescope of insight-hxmt |
we present a study of seven spectroscopically confirmed (lyα-emitting) galaxies at redshift z ≃ 6 using the jwst/nircam imaging data. these galaxies, with a wide range of lyα luminosities, were recently observed in a series of nircam broad and medium bands. we constrain the rest-frame uv/optical continua and measure th... | an hα impression of lyα galaxies at z ≃ 6 with deep jwst/nircam imaging |
it is now well established that globular clusters (gcs) exhibit star-to-star light-element abundance variations (known as multiple populations, mps). such chemical anomalies have been found in (nearly) all the ancient gcs (more than 10 gyr old) of our galaxy and its close companions, but so far no model for the origin ... | age as a major factor in the onset of multiple populations in stellar clusters |
binospec is a high-throughput, 370 to 1000 nm, imaging spectrograph that addresses two adjacent 8‧ by 15‧ fields of view. binospec was commissioned in late 2017 at the f/5 focus of the 6.5 m mmt and is now available to all mmt observers. aperture masks cut from stainless steel with a laser cutter are used to define the... | binospec: a wide-field imaging spectrograph for the mmt |
we investigate the bursty star formation histories (sfhs) of dwarf galaxies using the distribution of log({l}{{h}α }/{l}uv}) of 185 local galaxies. we expand on the work of weisz et al. to consider a wider range of sfhs and stellar metallicities, and show that there are large degeneracies in a periodic, top-hat burst m... | a closer look at bursty star formation with l hαand l uv distributions |
context. during its all-sky survey, the extended roentgen survey with an imaging telescope array (erosita) on board the spectrum-roentgen-gamma (srg) observatory has uncovered a growing number of x-ray transients associated with the nuclei of quiescent galaxies. benefitting from its large field of view and excellent se... | deciphering the extreme x-ray variability of the nuclear transient erasst j045650.3−203750. a likely repeating partial tidal disruption event |
using the australia telescope compact array, we conducted a survey of co j = 1 - 0 and j = 2 - 1 line emission towards strongly lensed high-redshift dusty star-forming galaxies (dsfgs) previously discovered with the south pole telescope (spt). our sample comprises 17 sources that had co-based spectroscopic redshifts ob... | a survey of the cold molecular gas in gravitationally lensed star-forming galaxies at z > 2 |
we present the discovery of the radio afterglow and near-infrared (nir) counterpart of the swift short gamma-ray burst (grb) grb 200522a, located at a small projected offset of ≈1 kpc from the center of a young, star-forming host galaxy at z = 0.5536. the radio and x-ray luminosities of the afterglow are consistent wit... | the broadband counterpart of the short grb 200522a at z = 0.5536: a luminous kilonova or a collimated outflow with a reverse shock? |
in this paper, we use a suitable conformal rescaling to construct static and rotating regular black holes in conformal massive gravity. the new metric is characterized by the mass m , the "scalar charge" q , the angular momentum parameter a , the "hair parameter" λ , and the conformal scale factor encoded in the parame... | rotating regular black holes in conformal massive gravity |
we measure the projected number density profiles of galaxies and the splashback feature in clusters selected by the sunyaev-zel'dovich effect from the advanced atacama cosmology telescope (advact) survey using galaxies observed by the dark energy survey (des). the splashback radius is consistent with cdm-only simulatio... | probing galaxy evolution in massive clusters using act and des: splashback as a cosmic clock |
recent observation of sagittarius a$^*$ (sgr a$^*$) by the event horizon telescope (eht) collaboration has uncovered various unanswered questions in black hole (bh) physics. besides, it may also probe various beyond the standard model (bsm) scenarios. one of the most profound possibilities is the search for ultralight ... | bounds on ultralight bosons from the event horizon telescope observation of sgr a$^*$ |
we investigate weak and strong deflection gravitational lensings of the regular black hole predicted by a non-minimal einstein-yang-mills theory. we find that its weak deflection lensing is the same as a reissner-nordström black hole's. observables in the strong deflection lensing, including the apparent radius of the ... | probing a regular non-minimal einstein-yang-mills black hole with gravitational lensings |
interacting dark energy models are widely renowned for giving an explanation to the cosmic coincidence problem as well as several observational issues. according to the recent observational data, and so far we are concerned with the literature, the choice of the interaction function between dark matter and dark energy ... | non-linear interacting cosmological models after planck 2018 legacy release and the h0 tension |
we propose a new imaging technique for radio and optical/infrared interferometry. the proposed technique reconstructs the image from the visibility amplitude and closure phase, which are standard data products of short-millimeter very long baseline interferometers such as the event horizon telescope (eht) and optical/i... | imaging the schwarzschild-radius-scale structure of m87 with the event horizon telescope using sparse modeling |
binary neutron stars (bnss) will spend ≃10-15 minutes in the band of advanced laser interferometer gravitational-wave observatory (ligo) and virgo detectors at design sensitivity. matched-filtering of gravitational-wave (gw) data could in principle accumulate enough signal-to-noise ratio (s/n) to identify a forthcoming... | an early-warning system for electromagnetic follow-up of gravitational-wave events |
we present a measurement of the b-mode polarization power spectrum (the bb spectrum) from 100 {{deg}}2 of sky observed with sptpol, a polarization-sensitive receiver currently installed on the south pole telescope. the observations used in this work were taken during 2012 and early 2013 and include data in spectral ban... | measurements of sub-degree b-mode polarization in the cosmic microwave background from 100 square degrees of sptpol data |
dual active galactic nuclei (agns) and offset agns are kpc-scale separation supermassive black holes pairs created during galaxy mergers, where both or one of the black holes are agns, respectively. these dual and offset agns are valuable probes of the link between mergers and agns but are challenging to identify. here... | merger-driven fueling of active galactic nuclei: six dual and offset agns discovered with chandra and hubble space telescope observations |
observations of astrophysical objects such as galaxies are limited by various sources of random and systematic noise from the sky background, the optical system of the telescope and the detector used to record the data. conventional deconvolution techniques are limited in their ability to recover features in imaging da... | generative adversarial networks recover features in astrophysical images of galaxies beyond the deconvolution limit |
we prove a purity property in telescopically localized algebraic $k$-theory of ring spectra: for $n\geq 1$, the $t(n)$-localization of $k(r)$ only depends on the $t(0)\oplus \dots \oplus t(n)$-localization of $r$. this complements a classical result of waldhausen in rational $k$-theory. combining our result with work o... | purity in chromatically localized algebraic $k$-theory |
gravitational wave signal from the inspirai of stellar-mass binary black hole can be used as standard sirens to perform cosmological inference. this inspirai covers a wide range of frequency bands, from the millihertz band to the audio-band, allowing for detections by both space-borne and ground-based gravitational wav... | constraining the hubble constant to a precision of about 1% using multi-band dark standard siren detections |
a field-deployable water vapor profiling instrument that builds on the foundation of the preceding generations of diode-laser-based differential absorption lidar (dial) laboratory prototypes was constructed and tested. significant advances are discussed, including a unique shared telescope design that allows expansion ... | field-deployable diode-laser-based differential absorption lidar (dial) for profiling water vapor |
we present spatially resolved atacama large millimeter/submillimeter array (alma) 870 μm dust continuum maps of six massive, compact, dusty star-forming galaxies at z ∼ 2.5. these galaxies are selected for their small rest-frame optical sizes ({r}{{e,f160w}}∼ 1.6 kpc) and high stellar mass densities that suggest that t... | sub-kiloparsec alma imaging of compact star-forming galaxies at z ~ 2.5: revealing the formation of dense galactic cores in the progenitors of compact quiescent galaxies |
we present the results of an ultradeep, comprehensive radio continuum survey for the accretion signatures of intermediate-mass black holes (imbhs) in globular clusters (gcs). the sample, imaged with the karl g. jansky very large array and the australia telescope compact array, comprises 50 galactic gcs. no compelling e... | the maveric survey: still no evidence for accreting intermediate-mass black holes in globular clusters |
we characterize infrared spectral energy distributions of 343 (ultra)luminous infrared galaxies from z = 0.3-2.8. we diagnose the presence of an active galactic nucleus (agn) by decomposing individual spitzer mid-ir spectroscopy into emission from star formation and an agn-powered continuum; we classify sources as star... | the role of star formation and an agn in dust heating of z = 0.3-2.8 galaxies. i. evolution with redshift and luminosity |
we present morpheus, a new model for generating pixel-level morphological classifications of astronomical sources. morpheus leverages advances in deep learning to perform source detection, source segmentation, and morphological classification pixel-by-pixel via a semantic segmentation algorithm adopted from the field o... | morpheus: a deep learning framework for the pixel-level analysis of astronomical image data |
sunspot observations are available in fairly good numbers since 1610, after the invention of the telescope. this review is concerned with those sunspot observations of which longer records and drawings in particular are available. those records bear information beyond the classical sunspot numbers or group sunspot numb... | historical sunspot records |
the space telescope imaging spectrograph has measured the spectral energy distributions for several stars of types o, b, a, f, and g. these absolute fluxes from the calspec database are fit with a new spectral grid computed from the atlas-apogee atlas9 model atmosphere database using a chi-square minimization technique... | a new stellar atmosphere grid and comparisons with hst/stis calspec flux distributions |
we present the iram-30 m observations of multiple-j co (jup mostly from 3 up to 8) and [c i](3p2 → 3p1) ([c i](2-1) hereafter) line emission in a sample of redshift ~2-4 submillimeter galaxies (smgs). these smgs are selected among the brightest-lensed galaxies discovered in the herschel-astrophysical terahertz large ar... | molecular gas in the herschel-selected strongly lensed submillimeter galaxies at z 2-4 as probed by multi-j co lines |
this paper defines the uk infra-red telescope (ukirt) hemisphere survey (uhs) and release of the remaining ∼12 700 deg2 of j-band survey data products. the uhs will provide continuous j- and k-band coverage in the northern hemisphere from a declination of 0° to 60° by combining the existing large area survey, galactic ... | the ukirt hemisphere survey: definition and j-band data release |
we show how gravitational-wave observations with advanced detectors of tens to several tens of neutron-star binaries can measure the neutron-star radius with an accuracy of several to a few percent, for mass and spatial distributions that are realistic, and with none of the sources located within 100 mpc. we achieve su... | neutron-star radius from a population of binary neutron star mergers |
we have started a new, deep multi-imaging survey of the fornax cluster, dubbed the fornax deep survey (fds), at the vlt survey telescope (vst). in this paper we present the deep photometry inside two square degrees around the bright galaxy ngc 1399 in the core of the cluster. we found that the core of the fornax cluste... | the fornax deep survey with vst. i. the extended and diffuse stellar halo of ngc 1399 out to 192 kpc |
we report the detection of the sulfur-bearing species ncs, hccs, h2ccs, h2cccs, and c4s for the first time in space. these molecules were found towards tmc-1 through the observation of several lines for each species. we also report the detection of c5s for the first time in a cold cloud through the observation of five ... | tmc-1, the starless core sulfur factory: discovery of ncs, hccs, h2ccs, h2cccs, and c4s and detection of c5s |
we present the discovery of a new dwarf galaxy, hydra ii, found serendipitously within the data from the ongoing survey of the magellanic stellar history conducted with the dark energy camera on the blanco 4 m telescope. the new satellite is compact ({{r}h}=68 ± 11 pc) and faint ({{m}v}=-4.8 ± 0.3), but well within the... | hydra ii: a faint and compact milky way dwarf galaxy found in the survey of the magellanic stellar history |
we present high-resolution magellan/mike spectroscopy of 42 red giant stars in seven stellar streams confirmed by the southern stellar stream spectroscopic survey (s5): atlas, aliqa uma, chenab, elqui, indus, jhelum, and phoenix. abundances of 30 elements have been derived from over 10,000 individual line measurements ... | the southern stellar stream spectroscopic survey (s5): chemical abundances of seven stellar streams |
computational atomic physics continues to play a crucial role in both increasing the understanding of fundamental physics (e.g., quantum electrodynamics and correlation) and producing atomic data for interpreting observations from large-scale research facilities ranging from fusion reactors to high-power laser systems,... | an introduction to relativistic theory as implemented in grasp |
starting from the observing campaign in april 2018, the greenland telescope (glt) has been added as a new station of the event horizon telescope (eht) array. visibilities on baselines to the glt, particularly in the north-south direction, potentially provide valuable new constraints for the modeling and imaging of sour... | absolute flux density calibration of the greenland telescope data for event horizon telescope observations |
the flavor composition of tev--pev astrophysical neutrinos, i.e., the proportion of neutrinos of different flavors in their flux, is a versatile probe of high-energy astrophysics and fundamental physics. because flavor identification is challenging and the number of detected high-energy astrophysical neutrinos is limit... | identifying energy-dependent flavor transitions in high-energy astrophysical neutrino measurements |
over the past year, jwst has uncovered galaxies at record-breaking distances up to $z \sim 13$. the jwst uncover (ultra-deep nirspec and nircam observations before the epoch of reionization) program has obtained ultra-deep multiwavelength nircam imaging of the massive galaxy cluster abell 2744 over $\sim 45$ arcmin$^{2... | jwst uncover: the overabundance of ultraviolet-luminous galaxies at $z>9$ |
this paper discusses the science case for a sensitive spectro-polarimetric survey of the microwave sky. such a survey would provide a tomographic and dynamic census of the three-dimensional distribution of hot gas, velocity flows, early metals, dust, and mass distribution in the entire hubble volume, exploit cmb temper... | microwave spectro-polarimetry of matter and radiation across space and time |
active galaxies, especially blazars, are among the most promising neutrino source candidates. to date, antares searches for these objects considered gev-tev $\gamma$-ray bright blazars. here, a statistically complete radio-bright blazar sample is used as the target for searches of origins of neutrinos collected by the ... | searches for neutrinos in the direction of radio-bright blazars with the antares telescope |
assuming axion-like particles account for the entirety of the dark matter in the universe, we study the possibility of detecting their decay into photons at radio frequencies. we discuss different astrophysical targets, such as dwarf spheroidal galaxies, the galactic center and halo, and galaxy clusters. the presence o... | detecting the stimulated decay of axions at radio frequencies |
we present a preview of the faint dwarf galaxy discoveries that will be possible with the vera c. rubin observatory and subaru hyper suprime-cam in the next decade. in this work, we combine deep ground-based images from the panoramic imaging survey of centaurus and sculptor and extensive image simulations to investigat... | resolved dwarf galaxy searches within5 mpc with the vera rubin observatory and subaru hyper suprime-cam |
galaxy-galaxy weak lensing is a direct probe of the mean matter distribution around galaxies. the depth and sky coverage of the canada-france-hawaii telescope legacy survey yield statistically significant galaxy halo mass measurements over a much wider range of stellar masses (108.75 to 1011.3 m⊙) and redshifts (0.2 &l... | cfhtlens: co-evolution of galaxies and their dark matter haloes |
we analyze the angular momenta of massive star-forming galaxies (sfgs) at the peak of the cosmic star formation epoch (z ∼ 0.8-2.6). our sample of ∼360 log(m */m ⊙) ∼ 9.3-11.8 sfgs is mainly based on the kmos3d and sins/zc-sinf surveys of hα kinematics, and collectively provides a representative subset of the massive s... | the angular momentum distribution and baryon content of star-forming galaxies at z ∼ 1-3 |
we present the discovery of a faint milky way satellite, laevens 2/triangulum ii, found in the panoramic survey telescope and rapid response system 3π imaging data and confirmed with follow-up wide-field photometry from the large binocular cameras. the stellar system, with an absolute magnitude of mv = -1.8 ± 0.5, a he... | a new faint milky way satellite discovered in the pan-starrs1 3π survey |
we report the first result of a direct search for a cosmic axion background (c a b )—a relativistic background of axions that is not dark matter—performed with the axion haloscope, the axion dark matter experiment (admx). conventional haloscope analyses search for a signal with a narrow bandwidth, as predicted for dark... | search for a dark-matter-induced cosmic axion background with admx |
the newly launched x-ray satellite, erosita, has recently revealed two gigantic bubbles extending to ~80° above and below the galactic centre. the morphology of these `erosita bubbles' bears a remarkable resemblance to the fermi bubbles previously discovered by the fermi gamma-ray space telescope and its counterpart, t... | fermi and erosita bubbles as relics of the past activity of the galaxy's central black hole |
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