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deep spectroscopic observations of z ≳ 6.5 galaxies have revealed a marked decline with increasing redshift in the detectability of ly α emission. while this may offer valuable insight into the end of the reionization process, it presents a challenge to the detailed spectroscopic study of bright photometrically-selecte... | spectroscopic detections of c iii] λ1909 å at z ≃ 6-7: a new probe of early star-forming galaxies and cosmic reionization |
the recent james webb space telescope tentative discovery of a population of super-early (redshift z > 10), relatively massive (stellar mass m* = 108-109m⊙) and evolved (metallicity z ≈ 0.1 z⊙) galaxies, which nevertheless show blue (β ≃ -2.6) spectra, and very small dust attenuation (av ≲ 0.02), challenges our inte... | blue monsters. why are jwst super-early, massive galaxies so blue? |
we present intermediate-resolution spectroscopy of the optical counterpart to the black hole x-ray transient maxi j1820+070 (=asassn-18ey) obtained with the osiris spectrograph on the 10.4 m gran telescopio canarias. the observations were performed with the source close to the quiescent state and before the onset of re... | the binary mass ratio in the black hole transient maxi j1820+070 |
we estimate the upper limit redshifts of known fast radio bursts (frbs) using the dispersion measure (dm)-redshift (z) relation and derive the upper limit peak luminosity lpand energy e of frbs within the observational band. the average z upper limits range from 0.17 to 3.10, the average lpupper limits range from 1.24 ... | fast radio burst energetics and detectability from high redshifts |
we present magellan/imacs spectroscopy of the recently discovered milky way satellite eridanus ii (eri ii). we identify 28 member stars in eri ii, from which we measure a systemic radial velocity of {v}{hel}=75.6+/- 1.3 {{(stat.)}} +/- 2.0 {{(sys.)}} {km} {{{s}}}-1 and a velocity dispersion of {6.9}-0.9+1.2 {km} {{{s}}... | farthest neighbor: the distant milky way satellite eridanus ii |
very long baseline interferometric (vlbi) localizations of repeating fast radio bursts (frbs) have demonstrated a diversity of local environments: from nearby star-forming regions to globular clusters. here we report the vlbi localization of frb 20201124a using an ad hoc array of dishes that also participate in the eur... | milliarcsecond localization of the repeating frb 20201124a |
one favored progenitor model for short duration gamma-ray bursts (grbs) is the coalescence of two neutron stars (ns-ns). one possible outcome of such a merger would be a rapidly spinning, strongly magnetized neutron star (known as a millisecond magnetar). these magnetars may be “supra-massive,” implying that they would... | the millisecond magnetar central engine in short grbs |
we present the radial gas-phase, mass-weighted metallicity profiles and gradients of the tng50 star-forming galaxy population measured at redshifts z = 0-3. we investigate the redshift evolution of gradients and examine relations between gradient (negative) steepness and galaxy properties. we find that tng50 gradients ... | gas-phase metallicity gradients of tng50 star-forming galaxies |
the optical module of the km3net neutrino telescope is an innovative multi-faceted large area photodetection module. it contains 31 three-inch photomultiplier tubes in a single 0.44 m diameter pressure-resistant glass sphere. the module is a sensory device also comprising calibration instruments and electronics for pow... | the km3net multi-pmt optical module |
we present an analysis of multi unit spectroscopic explorer (muse) observations obtained on the massive frontier fields (ffs) cluster a2744. this new data set covers the entire multiply imaged region around the cluster core. the combined catalogue consists of 514 spectroscopic redshifts (with 414 new identifications). ... | strong-lensing analysis of a2744 with muse and hubble frontier fields images |
we report the discovery of 158 previously undetected dwarf galaxies in the fornax cluster central regions using a deep coadded u-, g-, and i-band image obtained with the dark energy camera wide-field camera mounted on the 4-m blanco telescope at the cerro tololo interamerican observatory as part of the next generation ... | unveiling a rich system of faint dwarf galaxies in the next generation fornax survey |
axions may be produced in abundance inside stellar cores and then convert into observable x rays in the galactic magnetic fields. we focus on the quintuplet and westerlund 1 super star clusters, which host large numbers of hot, young stars including wolf-rayet stars; these stars produce axions efficiently through the a... | x-ray searches for axions from super star clusters |
inspired by the observations of the supermassive black hole m87* by the event horizon telescope (eht), a remarkable surge in black hole physics is to use the black hole shadow's observables to distinguish between general relativity and modified theories of gravity, which could also help to reveal the astrophysical natu... | photon regions, shadow observables, and constraints from m87* of a charged rotating black hole |
we conduct a pseudo-cℓ analysis of the tomographic cross-correlation between 1000 deg2 of weak-lensing data from the kilo-degree survey (kids-1000) and the thermal sunyaev-zeldovich (tsz) effect measured by planck and the atacama cosmology telescope (act). using hmx, a halo-model-based approach that consistently models... | joint constraints on cosmology and the impact of baryon feedback: combining kids-1000 lensing with the thermal sunyaev-zeldovich effect from planck and act |
the south pole telescope summertime line intensity mapper (spt-slim) is a pathfinder experiment that will demonstrate the use of on-chip filter-bank spectrometers for mm-wave line intensity mapping (lim). the spt-slim focal plane consists of 18 dual-polarization r=300 filter-bank spectrometers covering 120-180 ghz, cou... | spt-slim: a line intensity mapping pathfinder for the south pole telescope |
we report measurements of the gravitationally lensed secondary image-the first in an infinite series of so-called "photon rings"-around the supermassive black hole m87* via simultaneous modeling and imaging of the 2017 event horizon telescope (eht) observations. the inferred ring size remains constant across the seven ... | the photon ring in m87* |
the mechanism that produces fast radio burst (frb) emission is poorly understood. targeted monitoring of repeating frb sources provides the opportunity to fully characterize the emission properties in a manner impossible with one-off bursts. here, we report observations of the source of frb 20201124a, with the australi... | circularly polarized radio emission from the repeating fast radio burst source frb 20201124a |
we report on the detection of a black hole (ngc 1850 bh1) in the ~100-myr-old massive cluster ngc 1850 in the large magellanic cloud. it is in a binary system with a main-sequence turn-off star (4.9 ± 0.4 m⊙), which is starting to fill its roche lobe and is becoming distorted. using 17 epochs of very large telescope/mu... | a black hole detected in the young massive lmc cluster ngc 1850 |
we consider the interplay of the early dark energy (ede) model, the swampland distance conjecture (sdc), and cosmological parameter tensions. ede is a proposed resolution of the hubble tension relying upon a near-planckian scalar field excursion, while the sdc predicts an exponential sensitivity of masses of other fiel... | early dark sector, the hubble tension, and the swampland |
in the past centuries, the scale of engineering optics has evolved toward two opposite directions: one is represented by giant telescopes with apertures larger than tens of meters and the other is the rapidly developing micro/nano‑optics and nanophotonics. at the nanoscale, subwavelength light–matter interaction is ble... | subwavelength artificial structures: opening a new era for engineering optics |
we present chemical abundances derived from high-resolution magellan/magellan inamori kyocera echelle spectra of the nine brightest known red giant members of the ultra-faint dwarf galaxy reticulum ii (ret ii). these stars span the full metallicity range of ret ii (-3.5 < [fe/h] < -2). seven of the nine stars hav... | complete element abundances of nine stars in the r-process galaxy reticulum ii |
the long anticipated james webb space telescope (jwst) will be able to directly detect large samples of galaxies at very high redshift. using the well-established, computationally efficient santa cruz semi-analytic model, with recently implemented multiphase gas partitioning, and h2-based star formation recipes, we mak... | semi-analytic forecasts for jwst - ii. physical properties and scaling relations for galaxies at z = 4-10 |
spectral lines are among the most powerful signatures for dark matter (dm) annihilation searches in very-high-energy γ rays. the central region of the milky way halo is one of the most promising targets given its large amount of dm and proximity to earth. we report on a search for a monoenergetic spectral line from sel... | search for γ -ray line signals from dark matter annihilations in the inner galactic halo from 10 years of observations with h.e.s.s. |
the extragalactic distance database (edd) was created as a repository for high-quality, redshift-independent distances. a key component of edd is the color-magnitude diagrams/tip of the red giant branch (cmds/trgb) catalog, which provides information on the stellar content of nearby galaxies observed with the hubble sp... | the extragalactic distance database: the color-magnitude diagrams/tip of the red giant branch distance catalog |
we observed hubble deep field south with the new panoramic integral-field spectrograph muse that we built and have just commissioned at the vlt. the data cube resulting from 27 h of integration covers one arcmin2 field of view at an unprecedented depth with a 1σ emission-line surface brightness limit of 1 × 10-19 erg s... | the muse 3d view of the hubble deep field south |
the event horizon telescope (eht) collaboration recently unveiled the first image of the supermassive black hole m87*, which exhibited a ring of angular diameter θd= 42 ± 3 μas, a circularity deviation of δc ≤ 0.1, and also inferred a black hole mass of m = (6.5 ± 0.7) × 109 m ⊙. this provides a new window onto tests o... | testing horndeski gravity from eht observational results for rotating black holes |
we identify a largely model-independent signature of dark matter (dm) interactions with nucleons and electrons. dm in the local galactic halo, gravitationally accelerated to over half the speed of light, scatters against and deposits kinetic energy into neutron stars, heating them to infrared blackbody temperatures. th... | dark kinetic heating of neutron stars and an infrared window on wimps, simps, and pure higgsinos |
axion dark matter (dm) may convert to radio-frequency electromagnetic radiation in the strong magnetic fields around neutron stars. the radio signature of such a process would be an ultranarrow spectral peak at a frequency determined by the mass of the axion particle. we analyze data we collected from the robert c. byr... | green bank and effelsberg radio telescope searches for axion dark matter conversion in neutron star magnetospheres |
we introduce a hubble space telescope (hst)/space telescope imaging spectrograph (stis) stellar census of r136a, the central ionizing star cluster of 30 doradus. we present low resolution far-ultraviolet stis spectroscopy of r136 using 17 contiguous 52 arcsec × 0.2 arcsec slits which together provide complete coverage ... | the r136 star cluster dissected with hubble space telescope/stis. i. far-ultraviolet spectroscopic census and the origin of he ii λ1640 in young star clusters |
the double chooz collaboration presents a measurement of the neutrino mixing angle θ 13 using reactor overline{νe} observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. this measurement is based on 462.72 live days data, approximately twice as much data as in the previous such analy... | measurement of θ 13 in double chooz using neutron captures on hydrogen with novel background rejection techniques |
the magic telescopes are two imaging atmospheric cherenkov telescopes (iacts) located on the canary island of la palma. the telescopes are designed to measure cherenkov light from air showers initiated by gamma rays in the energy regime from around 50 gev to more than 50 tev. the two telescopes were built in 2004 and 2... | the major upgrade of the magic telescopes, part i: the hardware improvements and the commissioning of the system |
it is postulated in einstein's relativity that the speed of light in vacuum is a constant for all observers. however, the effect of quantum gravity could bring an energy dependence of light speed, and a series of studies on high-energy photon events from gamma-ray bursts (grbs) and active galactic nuclei (agns) suggest... | light speed variation from grb 221009a |
we present the concept of bluemuse, a blue-optimised, medium spectral resolution, panoramic integral field spectrograph based on the muse concept and proposed for the very large telescope. with an optimised transmission down to 350 nm, a larger fov (1.4 x 1.4 arcmin$^2$) and a higher spectral resolution compared to mus... | bluemuse: project overview and science cases |
the cherenkov telescope array (cta), the new-generation ground-based observatory for γ astronomy, provides unique capabilities to address significant open questions in astrophysics, cosmology, and fundamental physics. we study some of the salient areas of γ cosmology that can be explored as part of the key science proj... | sensitivity of the cherenkov telescope array for probing cosmology and fundamental physics with gamma-ray propagation |
the type ii seesaw mechanism provides a minimal framework to explain the neutrino masses involving the introduction of a single triplet higgs to the standard model. however, this simple extension was believed to be unable to successfully explain the observed baryon asymmetry of the universe through leptogenesis. in our... | type ii seesaw leptogenesis |
the central region of the milky way is one of the foremost locations to look for dark matter (dm) signatures. we report the first results on a search for dm particle annihilation signals using new observations from an unprecedented γ -ray survey of the galactic center (gc) region, i.e., the inner galaxy survey, at very... | search for dark matter annihilation signals in the h.e.s.s. inner galaxy survey |
we present our lens mass model of smacs j0723.3−7327, the first strong gravitational lens observed by the james webb space telescope (jwst). we use data from the hubble space telescope and the multi unit spectroscopic explorer (muse) to build our `pre-jwst' lens model and then refine it with newly available jwst near-i... | first jwst observations of a gravitational lens. mass model from new multiple images with near-infrared observations of smacs j0723.3−7327 |
an ultra-deep, high-resolution millimeter-wave survey over half the sky would answer many outstanding questions in both fundamental physics of the universe and astrophysics. cmb-hd will deliver this survey in 5 years of observing, using two new 30-meter-class off-axis cross-dragone telescopes to be located at cerro toc... | cmb-hd: an ultra-deep, high-resolution millimeter-wave survey over half the sky |
this paper is a high-level description of the development, implementation and initial testing of the meerkat radio telescope and its subsystems. the rationale for the design and technology choices is presented in the context of the requirements of the meerkat large-scale survey projects. a technical overview is provide... | the meerkat radio telescope |
context. ultraviolet (uv) emission-line spectra are used to spectroscopically confirm high-z galaxies and increasingly also to determine their physical properties.aims: we construct photoionization models to interpret the observed uv spectra of distant galaxies in terms of the dominant radiation field and the physical ... | the vimos ultra deep survey: nature, ism properties, and ionizing spectra of ciii]λ1909 emitters at z = 2-4 |
the recent detection of a binary neutron star merger and the clear evidence of the decay of radioactive material observed in this event have, after 60 years of effort, provided an astrophysical site for the rapid neutron-capture (r-) process which is responsible for the production of the heaviest elements in our univer... | the r-process alliance: first release from the southern search for r-process-enhanced stars in the galactic halo |
we propose a new experiment at the large hadron collider (lhc) that offers a powerful and model-independent probe for milli-charged particles. this experiment could be sensitive to charges in the range 10-3 e-10-1 e for masses in the range 0.1-100 gev, which is the least constrained part of the parameter space for mill... | looking for milli-charged particles with a new experiment at the lhc |
the repeating frb 20201124a was first discovered by chime/frb in november of 2020, after which it was seen to repeat a few times over several months. it entered a period of high activity in april of 2021, at which time several observatories recorded tens to hundreds more bursts from the source. these follow-up observat... | a sudden period of high activity from repeating fast radio burst 20201124a |
we present images and a multiwavelength photometric catalog based on all of the jwst nircam observations obtained to date in the region of the abell 2744 galaxy cluster. these data come from three different programs, namely, the glass-jwst early release science program, uncover, and the director's discretionary time pr... | the glass-jwst early release science program. ii. stage i release of nircam imaging and catalogs in the abell 2744 region |
optical imaging systems, like microscopes, cameras, and telescopes, continue to expand the scope of human observation of the world. as one of the key indicators of imaging systems, the field-of-view (fov) is often limited by coma aberration. expanding it generally relies on a combination of complex lenses, leading to a... | c.m.o.s. devices fabricated on buried sio2 layers formed by oxygen implantation into silicon |
rr lyrae stars may be the best practical tracers of galactic halo (sub-)structure and kinematics. the panstarrs1 (ps1) 3π survey offers multi-band, multi-epoch, precise photometry across much of the sky, but a robust identification of rr lyrae stars in this data set poses a challenge, given ps1's sparse, asynchronous m... | machine-learned identification of rr lyrae stars from sparse, multi-band data: the ps1 sample |
in this study we present the first results from multi-wavelength hubble space telescope (hst) observations of the galactic globular cluster (gc) ngc 2808 as an extension of the hubble space telescope uv legacy survey of galactic gcs (go-13297 and previous proprietary and hst archive data). our analysis allowed us to di... | the hubble space telescope uv legacy survey of galactic globular clusters. iii. a quintuple stellar population in ngc 2808 |
we present an overview of the first data release (dr1) and first-look science from the green bank ammonia survey (gas). gas is a large program at the green bank telescope to map all gould belt star-forming regions with {a}{{v}}≳ 7 mag visible from the northern hemisphere in emission from nh3 and other key molecular tra... | the green bank ammonia survey: first results of nh3 mapping of the gould belt |
the fermi large area telescope (lat) collaboration has recently released a catalog of 360 sources detected above 50 gev (2fhl). this catalog was obtained using 80 months of data re-processed with pass 8, the newest event-level analysis, which significantly improves the acceptance and angular resolution of the instrumen... | resolving the extragalactic γ -ray background above 50 gev with the fermi large area telescope |
this paper introduces cosmodc2, a large synthetic galaxy catalog designed to support precision dark energy science with the large synoptic survey telescope (lsst). cosmodc2 is the starting point for the second data challenge (dc2) carried out by the lsst dark energy science collaboration (lsst desc). the catalog is bas... | cosmodc2: a synthetic sky catalog for dark energy science with lsst |
we derive 2d dust attenuation maps at ∼1 kpc resolution from the uv continuum for 10 galaxies on the z ∼ 2 star-forming main sequence (sfms). comparison with ir data shows that 9 out of 10 galaxies do not require further obscuration in addition to the uv-based correction, though our sample does not include the most hea... | dust attenuation, bulge formation, and inside-out quenching of star formation in star-forming main sequence galaxies at z ∼ 2 |
context. the lack of high-precision long-term continuous photometric data for large samples of stars has impeded the large-scale exploration of pulsational variability in the ob star regime. as a result, the candidates for in-depth asteroseismic modelling have remained limited to a few dozen dwarfs. the tess nominal sp... | variability of ob stars from tess southern sectors 1-13 and high-resolution iacob and own spectroscopy |
we present a catalog of ultra-diffuse galaxies (udgs) in the coma cluster. udgs are a subset of low surface brightness (sb) galaxies with very large effective radii defined by van dokkum et al. we surveyed the subaru data archive for deep suprime-cam/subaru r-band images, and used data covering the 1.°7 × 2.°7 region o... | catalog of ultra-diffuse galaxies in the coma clusters from subaru imaging data |
the european spallation source (ess), presently well on its way to completion, will soon provide the most intense neutron beams for multi-disciplinary science. fortuitously, it will also generate the largest pulsed neutrino flux suitable for the detection of coherent elastic neutrino-nucleus scattering (ceνns), a proce... | coherent elastic neutrino-nucleus scattering at the european spallation source |
extending the earlier measurements reported in hitomi collaboration (2016, nature, 535, 117), we examine the atmospheric gas motions within the central 100 kpc of the perseus cluster using observations obtained with the hitomi satellite. after correcting for the point spread function of the telescope and using opticall... | atmospheric gas dynamics in the perseus cluster observed with hitomi |
using data recorded with the antares telescope from 2007 to 2015, a new search for dark matter annihilation in the milky way has been performed. three halo models and five annihilation channels, wimp + wimp → b b bar ,w+w- ,τ+τ- ,μ+μ- and ν ν bar , with wimp masses ranging from 50 gev/c2 to 100 tev/c2, were considered.... | results from the search for dark matter in the milky way with 9 years of data of the antares neutrino telescope |
since 2007, close binary and multiple stars are observed by speckle interferometry at the 4.1 m southern astrophysical research (soar) telescope. the hrcam instrument, observing strategy and planning, data processing and calibration methods, developed and improved during ten years, are presented here in a concise way. ... | ten years of speckle interferometry at soar |
high-energy astrophysical neutrinos, with tev--pev energies, offer unique insight into astrophysics and particle physics. their incoming directions and flavor composition -- i.e., the proportion of electron, muon, and tau neutrinos in their flux -- are, individually, rewarding observables. combined, they offer new oppo... | flavor anisotropy in the high-energy astrophysical neutrino sky |
we discuss some of the key open questions regarding the formation and evolution of globular clusters (gcs) during galaxy formation and assembly within a cosmological framework. the current state of the art for both observations and simulations is described, and we briefly mention directions for future research. the old... | globular cluster formation and evolution in the context of cosmological galaxy assembly: open questions |
the ultra high energy (uhe) cosmic neutrinos are expected to play a pivotal role in the disquisition of physics beyond the standard model of particle physics as well as serve as an ideal cosmic messengers. this epitomizes the selling point of several currently running or planned neutrino telescopes. the uhe cosmic neut... | cosmic neutrino flux and spin flavor oscillations in intergalactic medium |
an anomalous gamma-ray excess emission has been found in the fermi large area telescope data1 covering the centre of the galaxy2,3. several theories have been proposed for this `galactic centre excess'. they include self-annihilation of dark-matter particles4, an unresolved population of millisecond pulsars5, an unreso... | galactic bulge preferred over dark matter for the galactic centre gamma-ray excess |
we consider invisible neutrino decay νh→νl+ϕ in the ultra-relativistic limit and compute the neutrino anisotropy loss rate relevant for the cosmic microwave background (cmb) anisotropies. improving on our previous work which assumed masslessνl and ϕ , we reinstate in this work the daughter neutrino mass mν l in a manne... | weaker yet again: mass spectrum-consistent cosmological constraints on the neutrino lifetime |
we derive a robust bound on the qcd axion by confronting momentum-dependent boltzmann equations against up-to-date measurements of the cosmic microwave background, including ground-based telescopes, and abundances from big bang nucleosynthesis. we compare the axion phase-space distribution obtained from unitarized next... | the qcd axion: some like it hot |
the second wind forecast improvement project (wfip2) is a u.s. department of energy (doe)- and national oceanic and atmospheric administration (noaa)-funded program, with private-sector and university partners, which aims to improve the accuracy of numerical weather prediction (nwp) model forecasts of wind speed in com... | the second wind forecast improvement project (wfip2): observational field campaign |
herbig ae/be stars (haebes) span a key mass range that links low- and high-mass stars, and thus provide an ideal window from which to explore their formation. this paper presents very large telescope/x-shooter spectra of 91 haebes, the largest spectroscopic study of haebe accretion to date. a homogeneous approach to de... | a spectroscopic survey of herbig ae/be stars with x-shooter - i. stellar parameters and accretion rates |
fermipy is an open-source python framework that facilitates analysis of data collected by the fermi large area telescope (lat). fermipy is built on the fermi science tools, the publicly available software suite provided by nasa for the lat mission. fermipy provides a high-level interface for analyzing lat data in a sim... | fermipy: an open-source python package for analysis of fermi-lat data |
optimal analyses of many signals in the cosmic microwave background (cmb) require map-level extraction of individual components in the microwave sky, rather than measurements at the power spectrum level alone. to date, nearly all map-level component separation in cmb analyses has been performed exclusively using satell... | atacama cosmology telescope: component-separated maps of cmb temperature and the thermal sunyaev-zel'dovich effect |
we propose a novel particle physics model in which vector dark matter (vdm) and dark radiation (dr) originate from the same non-abelian dark sector. we show an illustrating example where dark su (3) is spontaneously broken into su (2) subgroup by the nonzero vacuum expectation value (vev) of a complex scalar in fundame... | residual non-abelian dark matter and dark radiation |
the milky way imaging scroll painting project is an unbiased galactic plane co survey for mapping regions of l=-10^\circ to +250° and | b| ≲ 5.°2 with the 13.7 m telescope of the purple mountain observatory. the legacy survey aims to observe the {}12{co}, {}13{co}, and c18o (j = 1-0) lines simultaneously with full-samp... | the milky way imaging scroll painting (mwisp): project details and initial results from the galactic longitudes of 25.°8-49.°7 |
we present the results of a search for bright (-22.7 ≤ muv ≤ -20.5) lyman-break galaxies at z ≃ 6 within a total of 1.65 deg2 of imaging in the ultravista/cosmological evolution survey (cosmos) and united kingdom infrared telescope deep sky survey (ukidss) ultra deep survey (uds) fields. the deep near-infrared imaging ... | the galaxy luminosity function at z ≃ 6 and evidence for rapid evolution in the bright end from z ≃ 7 to 5 |
the production of science-ready data from major solar telescopes requires expertise beyond that of the typical observer. this is a consequence of the increasing complexity of instruments and observing sequences, which require calibrations and corrections for instrumental and seeing effects that are not only difficult t... | crispred: a data pipeline for the crisp imaging spectropolarimeter |
the magnetic activity of the sun and other stars causes their brightness to vary. we investigated how typical the sun’s variability is compared with other solar-like stars, i.e., those with near-solar effective temperatures and rotation periods. by combining 4 years of photometric observations from the kepler space tel... | the sun is less active than other solar-like stars |
the wide-field imager for solar probe plus (wispr) is the sole imager aboard the solar probe plus (spp) mission scheduled for launch in 2018. spp will be a unique mission designed to orbit as close as 7 million km (9.86 solar radii) from sun center. wispr employs a 95∘ radial by 58∘ transverse field of view to image th... | the wide-field imager for solar probe plus (wispr) |
the hubble space telescope uv legacy survey of galactic globular clusters (gcs) has investigated gcs and their stellar populations. in previous papers of this series we have introduced a pseudo two-colour diagram, or `chromosome map' (chm) that maximizes the separation between the multiple populations. we have identifi... | the hubble space telescope uv legacy survey of galactic globular clusters - xix. a chemical tagging of the multiple stellar populations over the chromosome maps |
we report the detection of two isomers of ethynyl cyclopentadiene (c-c5h5cch), namely 1- and 2-ethynyl-1,3-cyclopentadiene, in the direction of tmc-1. we derive column densities of (1.4 ± 0.2) × 1012 cm−2 and (2.0 ± 0.4) × 1012 cm−2, respectively, for these two cyclopentadiene derivatives, which imply that they are abo... | discovery of two isomers of ethynyl cyclopentadiene in tmc-1: abundances of cch and cn derivatives of hydrocarbon cycles |
black hole images present an annular region of enhanced brightness. in the absence of propagation effects, this "photon ring" has universal features that are completely governed by general relativity and independent of the details of the emission. here, we show that the polarimetric image of a black hole also displays ... | universal polarimetric signatures of the black hole photon ring |
mass-loss rates and terminal wind velocities are key parameters that determine the kinetic wind energy and momenta of massive stars. furthermore, accurate mass-loss rates determine the mass and rotational velocity evolution of mass stars, and their fates as neutron stars and black holes in function of metallicity (z). ... | metallicity-dependent wind parameter predictions for ob stars |
we present a measurement of the cosmic microwave background lensing potential using 500 deg2 of 150 ghz data from the sptpol receiver on the south pole telescope. the lensing potential is reconstructed with signal-to-noise per mode greater than unity at lensing multipoles l ≲ 250, using a quadratic estimator on a combi... | a measurement of the cosmic microwave background lensing potential and power spectrum from 500 deg2 of sptpol temperature and polarization data |
given the potential of ensemble asteroseismology for understanding fundamental properties of large numbers of stars, it is critical to determine the accuracy of the scaling relations on which these measurements are based. from several powerful validation techniques, all indications so far show that stellar radius estim... | testing the asteroseismic scaling relations for red giants with eclipsing binaries observed by kepler |
the physics of neutron stars can be studied with gravitational waves emitted from coalescing binary systems. tidal effects become significant during the last few orbits and can be visible in the gravitational wave spectrum above 500 hz. after the merger, the neutron star remnant oscillates at frequencies above 1 khz an... | exploring the sensitivity of gravitational wave detectors to neutron star physics |
context. this is the second of three papers that search for the predicted stellar cusp around the milky way's central black hole, sagittarius a*, with new data and methods.aims: we aim to infer the distribution of the faintest stellar population currently accessible through observations around sagittarius a*.methods: w... | the distribution of stars around the milky way's central black hole. ii. diffuse light from sub-giants and dwarfs |
in the presence of a black hole, light sources connect to observers along multiple paths. as a result, observed brightness fluctuations must be correlated across different times and positions in black hole images. photons that execute multiple orbits around the black hole appear near a critical curve in the observer sk... | photon ring autocorrelations |
the b emission-line stars are rapid rotators that were probably spun up by mass and angular momentum accretion through mass transfer in an interacting binary. mass transfer will strip the donor star of its envelope to create a small and hot subdwarf remnant. here we report on hubble space telescope/stis far-ultraviolet... | the detection and characterization of be+sdo binaries from hst/stis fuv spectroscopy |
context. observations of the redshifted 21-cm line of neutral hydrogen (h i) are a new and powerful window of observation that offers us the possibility to map the spatial distribution of cosmic h i and learn about cosmology. baryon acoustic oscillations from integrated neutral gas observations (bingo) is a new unique ... | the bingo project. i. baryon acoustic oscillations from integrated neutral gas observations |
the cold dark matter (dm) model predicts that every galaxy contains thousands of dm subhalos; almost all other dm models include a physical process that smooths away the subhalos. the subhalos are invisible, but could be detected via strong gravitational lensing, if they lie on the line of sight to a multiply-imaged ba... | scanning for dark matter subhalos in hubble space telescope imaging of 54 strong lenses |
we present a new survey of hcn(1-0) emission, a tracer of dense molecular gas, focused on the little-explored regime of normal star-forming galaxy disks. combining hcn, co, and infrared (ir) emission, we investigate the role of dense gas in star formation, finding systematic variations in both the apparent dense gas fr... | variations in the star formation efficiency of the dense molecular gas across the disks of star-forming galaxies |
unification of gravity with other interactions, achieving the ultimate framework of quantum gravity, and fundamental problems in particle physics and cosmology motivate to consider extra spatial dimensions. the impact of these extra dimensions on the modified theories of gravity has attracted a lot of attention. one wa... | asymptotically locally flat and ads higher-dimensional black holes of einstein-horndeski-maxwell gravity in the light of eht observations: shadow behavior and deflection angle |
cosmic acceleration is the most surprising cosmological discovery in many decades. testing and distinguishing among possible explanations requires cosmological measurements of extremely high precision probing the full history of cosmic expansion and structure growth and, ideally, compare and contrast matter and relativ... | wfirst science investigation team "cosmology with the high latitude survey" annual report 2017 |
the integrated science investigation of the sun (isis) is a complete science investigation on the solar probe plus (spp) mission, which flies to within nine solar radii of the sun's surface. isis comprises a two-instrument suite to measure energetic particles over a very broad energy range, as well as coordinated manag... | integrated science investigation of the sun (isis): design of the energetic particle investigation |
using the example of the tidal stream of the milky way globular cluster palomar 5 (pal 5), we demonstrate how observational data on tidal streams can be efficiently reduced in dimensionality and modeled in a bayesian framework. our approach combines detection of stream overdensities by a difference-of-gaussians process... | globular cluster streams as galactic high-precision scales—the poster child palomar 5 |
we report for the first time a γ-ray and multiwavelength nearly periodic oscillation in an active galactic nucleus. using the fermi large area telescope we have discovered an apparent quasi-periodicity in the γ-ray flux (e > 100 mev) from the gev/tev bl lac object pg 1553+113. the marginal significance of the 2.18 ±... | multiwavelength evidence for quasi-periodic modulation in the gamma-ray blazar pg 1553+113 |
the accretion flow around the galactic centre black hole sagittarius a* (sgr a*) is expected to have an electron temperature that is distinct from the ion temperature, due to weak coulomb coupling in the low-density plasma. we present four two-temperature general relativistic radiative magnetohydrodynamic (grrmhd) simu... | the role of electron heating physics in images and variability of the galactic centre black hole sagittarius a* |
this paper describes development of a contactless, low cost vision-based system for displacement measurement of civil structures. displacement measurements provide a valuable insight into the structural condition and service behaviour of bridges under live loading. conventional displacement gauges or gps based systems ... | development and field testing of a vision-based displacement system using a low cost wireless action camera |
we set out to bridge the gap between regular black-hole spacetimes and observations of a black-hole shadow by the event horizon telescope. we explore modifications of spinning and non-spinning black-hole spacetimes inspired by asymptotically safe quantum gravity which features a scale dependence of the newton coupling.... | asymptotic safety casts its shadow |
we present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (vmp) stars based on the lamost survey and follow-up observations with the subaru telescope. it is the largest high-resolution vmp sample (including 363 new objects) studied by a single program, and the first attempt to accurately det... | four-hundred very metal-poor stars studied with lamost and subaru. ii. elemental abundances |
we investigate whether the emission of neutrinos observed in 2014-2015 from the direction of the blazar txs 0506+056 can be accommodated with leptohadronic multiwavelength models of the source commonly adopted for the 2017 flare. while multiwavelength data during the neutrino flare are sparse, the large number of neutr... | leptohadronic blazar models applied to the 2014-2015 flare of txs 0506+056 |
the advanced laser interferometer gravitational-wave observatory (ligo) discovered gravitational waves (gws) from a binary black hole merger in 2015 september and may soon observe signals from neutron star mergers. there is considerable interest in searching for their faint and rapidly fading electromagnetic (em) count... | going the distance: mapping host galaxies of ligo and virgo sources in three dimensions using local cosmography and targeted follow-up |
we investigate a well known scenario of interaction in the dark sector where the vacuum energy is interacting with cold dark matter throughout the cosmic evolution in light of the cosmic microwave background (cmb) data from final planck 2018 release. in addition to this minimal scenario, we generalize the model baselin... | dark calling dark: interaction in the dark sector in presence of neutrino properties after planck cmb final release |
the large early galaxy census (lega-c) is a public spectroscopic survey of ∼3200 k-band selected galaxies at redshifts z = 0.6 - 1.0 with stellar masses {m}*\gt {10}10\quad {m}⊙ , conducted with vimos on eso’s very large telescope. the survey is embedded in the cosmos field (r.a. = 10h00; {decl}. = +2 {deg}). the 20 hr... | the vlt lega-c spectroscopic survey: the physics of galaxies at a lookback time of 7 gyr |
the first james webb space telescope (jwst) data on the massive colliding cluster el gordo allow for 23 known families of multiply lensed images to be confirmed and for eight new members of these families to be identified. based on these families, which have been confirmed spectroscopically by muse, we derived an initi... | jwst\'s pearls: a new lens model for act-cl j0102−4915, "el gordo," and the first red supergiant star at cosmological distances discovered by jwst |
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