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gravity is a new instrument to coherently combine the light of the european southern observatory very large telescope interferometer to form a telescope with an equivalent 130 m diameter angular resolution and a collecting area of 200 m2. the instrument comprises fiber fed integrated optics beam combination, high resol... | first light for gravity: phase referencing optical interferometry for the very large telescope interferometer |
continued timing observations of the double pulsar psr j0737-3039a/b, which consists of two active radio pulsars (a and b) that orbit each other with a period of 2.45 h in a mildly eccentric (e =0.088 ) binary system, have led to large improvements in the measurement of relativistic effects in this system. with a 16-yr... | strong-field gravity tests with the double pulsar |
over the last 15 years, the supernova community has endeavoured to directly identify progenitor stars for core-collapse supernovae discovered in nearby galaxies. these precursors are often visible as resolved stars in high-resolution images from space-and ground-based telescopes. the discovery rate of progenitor stars ... | observational constraints on the progenitors of core-collapse supernovae: the case for missing high-mass stars |
axion stars are hypothetical objects formed of axions, obtained as localized and coherently oscillating solutions to their classical equation of motion. depending on the value of the field amplitude at the core |θ0 | ≡ | θ (r = 0) |, the equilibrium of the system arises from the balance of the kinetic pressure and eith... | dilute and dense axion stars |
since september 2018, lamost starts a new 5-year medium-resolution spectroscopic survey (mrs) using bright/gray nights. we present the scientific goals of lamost-mrs and propose a near optimistic strategy of the survey. a complete footprint is also provided. not only the regular medium-resolution survey, but also a tim... | lamost medium-resolution spectroscopic survey (lamost-mrs): scientific goals and survey plan |
we present the first generalization of navier-stokes theory to relativity that satisfies all of the following properties: (a) the system coupled to einstein's equations is causal and strongly hyperbolic; (b) equilibrium states are stable; (c) all leading dissipative contributions are present, i.e., shear viscosity, bul... | first-order general-relativistic viscous fluid dynamics |
astrophysical plasmas have the remarkable ability to preserve magnetic topology, which inevitably gives rise to the accumulation of magnetic energy within stressed regions including current sheets. this stored energy is often released explosively through the process of magnetic reconnection, which produces a reconfigur... | magnetic reconnection in the era of exascale computing and multiscale experiments |
as china's first x-ray astronomical satellite, the hard x-ray modulation telescope (hxmt), which was dubbed as insight-hxmt after the launch on june 15, 2017, is a wide-band (1-250 kev) slat-collimator-based x-ray astronomy satellite with the capability of all-sky monitoring in 0.2-3 mev. it was designed to perform poi... | overview to the hard x-ray modulation telescope (insight-hxmt) satellite |
we measure the stellar mass function (smf) and stellar mass density of galaxies in the cosmos field up to z ~ 6. we select them in the near-ir bands of the cosmos2015 catalogue, which includes ultra-deep photometry from ultravista-dr2, splash, and subaru/hyper suprime-cam. at z> 2.5 we use new precise photometric re... | the cosmos2015 galaxy stellar mass function . thirteen billion years of stellar mass assembly in ten snapshots |
the dense matter equation of state (eos) determines neutron star (ns) structure but can be calculated reliably only up to one to two times the nuclear saturation density, using accurate many-body methods that employ nuclear interactions from chiral effective field theory constrained by scattering data. in this work, we... | constraining the speed of sound inside neutron stars with chiral effective field theory interactions and observations |
stars orbiting the compact radio source sgr a* in the galactic center serve as precision probes of the gravitational field around the closest massive black hole. in addition to adaptive optics-assisted astrometry (with naco/vlt) and spectroscopy (with sinfoni/vlt, nirc2/keck and gnirs/gemini) over three decades, we hav... | mass distribution in the galactic center based on interferometric astrometry of multiple stellar orbits |
we have generated synthetic images of ∼27 000 galaxies from the illustristng and the original illustris hydrodynamic cosmological simulations, designed to match pan-starrs observations of log10(m*/m⊙) ≈ 9.8-11.3 galaxies at z ≈ 0.05. most of our synthetic images were created with the skirt radiative transfer code, incl... | the optical morphologies of galaxies in the illustristng simulation: a comparison to pan-starrs observations |
we complement the parsec data base of stellar evolutionary tracks with new models of massive stars, from the pre-main-sequence phase to the central carbon ignition. we consider a broad range of metallicities, 0.0001 ≤ z ≤ 0.04 and initial masses up to mini = 350 m⊙. the main difference with respect to our previous mode... | parsec evolutionary tracks of massive stars up to 350 m⊙ at metallicities 0.0001 ≤ z ≤ 0.04 |
the evolution of massive stars is influenced by the mass lost to stellar winds over their lifetimes. these winds limit the masses of the stellar remnants (such as black holes) that the stars ultimately produce. we used radio astrometry to refine the distance to the black hole x-ray binary cygnus x-1, which we found to ... | cygnus x-1 contains a 21-solar mass black hole—implications for massive star winds |
over the next 5 yr, the dark energy spectroscopic instrument (desi) will use 10 spectrographs with 5000 fibers on the 4 m mayall telescope at kitt peak national observatory to conduct the first stage iv dark energy galaxy survey. at z < 0.6, the desi bright galaxy survey (bgs) will produce the most detailed map of t... | the desi bright galaxy survey: final target selection, design, and validation |
the characterising exoplanet satellite (cheops) was selected on october 19, 2012, as the first small mission (s-mission) in the esa science programme and successfully launched on december 18, 2019, as a secondary passenger on a soyuz-fregat rocket from kourou, french guiana. cheops is a partnership between esa and swit... | the cheops mission |
globular clusters (gcs) formed when the milky way experienced a phase of rapid assembly. we use the wealth of information contained in the galactic gc population to quantify the properties of the satellite galaxies from which the milky way assembled. to achieve this, we train an artificial neural network on the e-mosai... | kraken reveals itself - the merger history of the milky way reconstructed with the e-mosaics simulations |
we report the detection of ten new binary black hole (bbh) mergers in the publicly released data from the first half of the third observing run (o3a) of advanced ligo and advanced virgo. we identify candidates using an updated version of the search pipeline described in venumadhav et al. [phys. rev. d 100, 023011 (2019... | new binary black hole mergers in the ligo-virgo o3a data |
in galaxy and mass assembly data release 4 (gama dr4), we make available our full spectroscopic redshift sample. this includes 248 682 galaxy spectra, and, in combination with earlier surveys, results in 330 542 redshifts across five sky regions covering ~250 deg2. the redshift density, is the highest available over su... | galaxy and mass assembly (gama): data release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions |
the gaia mission has opened a new window into the internal kinematics of young star clusters at the sub-km s-1 level, with implications for our understanding of how star clusters form and evolve. we use a sample of 28 clusters and associations with ages from ∼1-5 myr, where lists of members are available from previous ... | kinematics in young star clusters and associations with gaia dr2 |
we use high-precision photometry of red-giant-branch (rgb) stars in 57 galactic globular clusters (gcs), mostly from the `hubble space telescope (hst) uv legacy survey of galactic gcs', to identify and characterize their multiple stellar populations. for each cluster the pseudo-two-colour diagram (or `chromosome map') ... | the hubble space telescope uv legacy survey of galactic globular clusters - ix. the atlas of multiple stellar populations |
exoplanetary science is on the verge of an unprecedented revolution. the thousands of exoplanets discovered over the past decade have most recently been supplemented by discoveries of potentially habitable planets around nearby low-mass stars. currently, the field is rapidly progressing toward detailed spectroscopic ob... | exoplanetary atmospheres: key insights, challenges, and prospects |
the disk mass is among the most important input parameter for every planet formation model to determine the number and masses of the planets that can form. we present an alma 887 μm survey of the disk population around objects from ∼2 to 0.03 m ⊙ in the nearby ∼2 myr old chamaeleon i star-forming region. we detect ther... | a steeper than linear disk mass-stellar mass scaling relation |
we present the kmos3d survey, a new integral field survey of over 600 galaxies at 0.7 < z < 2.7 using kmos at the very large telescope. the kmos3d survey utilizes synergies with multi-wavelength ground- and space-based surveys to trace the evolution of spatially resolved kinematics and star formation from a homog... | the kmos3d survey: design, first results, and the evolution of galaxy kinematics from 0.7 <= z <= 2.7 |
the alma-alpine [cii] survey is aimed at characterizing the properties of a sample of normal star-forming galaxies (sfgs). the alma large program to investigate (alpine) features 118 galaxies observed in the [cii]-158 μm line and far infrared (fir) continuum emission during the period of rapid mass assembly, right afte... | the alpine-alma [cii] survey. survey strategy, observations, and sample properties of 118 star-forming galaxies at 4 < z < 6 |
local galaxies are broadly divided into two main classes, star-forming (gas-rich) and quiescent (passive and gas-poor). the primary mechanism responsible for quenching star formation in galaxies and transforming them into quiescent and passive systems is still unclear. sudden removal of gas through outflows or strippin... | strangulation as the primary mechanism for shutting down star formation in galaxies |
the evolution of the large-scale distribution of matter is sensitive to a variety of fundamental parameters that characterize the dark matter, dark energy, and other aspects of our cosmological framework. since the majority of the mass density is in the form of dark matter that cannot be directly observed, to do cosmol... | the bahamas project: calibrated hydrodynamical simulations for large-scale structure cosmology |
astrometric surveys such as gaia and lsst will measure parallaxes for hundreds of millions of stars. yet they will not measure a single distance. rather, a distance must be estimated from a parallax. in this didactic article, i show that doing this is not trivial once the fractional parallax error is larger than about ... | estimating distances from parallaxes |
the milestone of gw 170817-grb 170817a-at 2017gfo has shown that gravitational wave (gw) is produced during the merger of neutron star-neutron star/black hole and that in electromagnetic (em) wave a gamma-ray burst (grb) and a kilonovae (kn) are generated in sequence after the merger. observationally, however, em prope... | the quasi-periodically oscillating precursor of a long gamma-ray burst from a binary neutron star merger |
we combine deep imaging data from the ceers early release jwst survey and hst imaging from candels to examine the size-mass relation of star-forming galaxies and the morphology-quenching relation at stellar masses $\textrm{m}_{\star} \geq 10^{9.5} \ \textrm{m}_{\odot}$ over the redshift range $0.5 < z < 5.5$. in ... | evolution of the size-mass relation of star-forming galaxies since $z=5.5$ revealed by ceers |
multi-messenger astrophysics has produced a wealth of data with much more to come in the future. this enormous data set will reveal new insights into the physics of core collapse supernovae, neutron star mergers, and many other objects where it is actually possible, if not probable, that new physics is in operation. to... | two-moment neutrino flavor transformation with applications to the fast flavor instability in neutron star mergers |
we determine the adiabatic tidal contributions to the radiation reacted momentum impulse $\delta p_i^\mu$ and scattering angle $\theta$ between two scattered massive bodies (neutron stars) at next-to-next-to-leading post-minkowskian (pm) order. the state-of-the-art three-loop (4pm) worldline quantum field theory toolki... | tidal effects and renormalization at fourth post-minkowskian order |
with the aim of exploring the evidence for or against phase transitions in cold and dense baryonic matter, the inference of the sound speed and equation of state for dense matter in neutron stars is extended in view of recent new observational data. the impact of the heavy (2.35 m⊙) black-widow pulsar psr j0952-0607 an... | evidence against a strong first-order phase transition in neutron star cores: impact of new data |
hydrodynamical cosmological simulations are increasing their level of realism by considering more physical processes and having greater resolution or larger statistics. however, usually either the statistical power of such simulations or the resolution reached within galaxies are sacrificed. here, we introduce the newh... | introducing the newhorizon simulation: galaxy properties with resolved internal dynamics across cosmic time |
the stern-gerlach effect, discovered a century ago, has become a paradigm of quantum mechanics. surprisingly there has been little evidence that the original scheme with freely propagating atoms exposed to gradients from macroscopic magnets is a fully coherent quantum process. specifically, no full-loop stern-gerlach i... | realization of a complete stern-gerlach interferometer: toward a test of quantum gravity |
we present the results of a systematic study of the rest-frame optical morphology of quiescent galaxies at $z \geq 3$ using the near-infrared camera (nircam) onboard $jwst$. based on a sample selected by $uvj$ color or $nuvuvj$ color, we focus on 26 quiescent galaxies with $9.8<\log{(m_\star/m_\odot)}<11.4$ at $2... | size - stellar mass relation and morphology of quiescent galaxies at $z\\geq3$ in public $jwst$ fields |
we present preexplosion optical and infrared (ir) imaging at the site of the type ii supernova (sn ii) 2023ixf in messier 101 at 6.9 mpc. we astrometrically registered a ground-based image of sn 2023ixf to archival hubble space telescope (hst), spitzer space telescope (spitzer), and ground-based near-ir images. a singl... | sn 2023ixf in messier 101: a variable red supergiant as the progenitor candidate to a type ii supernova |
we reprise the analysis of stassun & torres, comparing the parallaxes of the eclipsing binaries reported in that paper to the parallaxes newly reported in the gaia second data release (dr2). we find evidence for a systematic offset of -82 ± 33 μas, in the sense of the gaia parallaxes being too small, for brightness... | evidence for a systematic offset of -80 μas in the gaia dr2 parallaxes |
while most of the compact-binary mergers detected by ligo and virgo are expected to consist of first-generation black holes formed from the collapse of stars, others might instead be of second (or higher) generation, containing the remnants of previous black-hole mergers. we review theoretical findings, astrophysical m... | hierarchical mergers of stellar-mass black holes and their gravitational-wave signatures |
we measure host galaxy stellar masses for a sample of five luminous quasars at $z\sim5-7$. using jwst/nircam medium-band images of nearby psf reference stars, we carefully subtract the contribution from the quasar light to place upper and lower limits on the flux of each host galaxy. we find that the members of our sam... | undermassive host galaxies of five z~6 luminous quasars detected with jwst |
we use the cosmic archaeology tool (cat) semi-analytical model to explore the contribution of population (pop) iii/ii stars and active galactic nuclei (agns) to the galaxy uv luminosity function (lf) evolution at $4 \leq z \leq 20$. we compare in particular with recent jwst data in order to explore the apparent tension... | exploring the nature of uv-bright $z \\gtrsim 10$ galaxies detected by jwst: star formation, black hole accretion, or a non-universal imf? |
in this paper we describe a new uv-initiative hubble space telescope project (go-13297) that will complement the existing f606w and f814w database of the advanced camera for surveys globular cluster (gc) treasury by imaging most of its clusters through uv/blue wfc3/uvis filters f275w, f336w, and f438w. this “magic trio... | the hubble space telescope uv legacy survey of galactic globular clusters. i. overview of the project and detection of multiple stellar populations |
we report on the high-precision timing of 42 radio millisecond pulsars (msps) observed by the european pulsar timing array (epta). this epta data release 1.0 extends up to mid-2014 and baselines range from 7-18 yr. it forms the basis for the stochastic gravitational-wave background, anisotropic background, and continuo... | high-precision timing of 42 millisecond pulsars with the european pulsar timing array |
combining the precise parallaxes and optical photometry delivered by gaia's second data release with the photometric catalogues of pan-starrs1, 2mass, and allwise, we derived bayesian stellar parameters, distances, and extinctions for 265 million of the 285 million objects brighter than g = 18. because of the wide wave... | photo-astrometric distances, extinctions, and astrophysical parameters for gaia dr2 stars brighter than g = 18 |
in this paper, we describe the international pulsar timing array second data release, which includes recent pulsar timing data obtained by three regional consortia: the european pulsar timing array, the north american nanohertz observatory for gravitational waves, and the parkes pulsar timing array. we analyse and wher... | the international pulsar timing array: second data release |
as part of an on-going effort to identify, understand and correct for astrophysics biases in the standardization of type ia supernovae (sn ia) for cosmology, we have statistically classified a large sample of nearby sne ia into those that are located in predominantly younger or older environments. this classification i... | strong dependence of type ia supernova standardization on the local specific star formation rate |
as they evolve, white dwarfs undergo major changes in surface composition, a phenomenon known as spectral evolution. in particular, some stars enter the cooling sequence with helium atmospheres (type do) but eventually develop hydrogen atmospheres (type da), most likely through the upward diffusion of residual hydrogen... | on the spectral evolution of hot white dwarf stars. i. a detailed model atmosphere analysis of hot white dwarfs from sdss dr12 |
we use cosmological simulations from the fire (feedback in realistic environments) project to study the baryon cycle and galaxy mass assembly for central galaxies in the halo mass range mhalo ∼ 1010-1013 m⊙. by tracing cosmic inflows, galactic outflows, gas recycling and merger histories, we quantify the contribution o... | the cosmic baryon cycle and galaxy mass assembly in the fire simulations |
we present an updated version of the hmcode augmented halo model that can be used to make accurate predictions of the non-linear matter power spectrum over a wide range of cosmologies. major improvements include modelling of baryon-acoustic oscillation (bao) damping in the power spectrum and an updated treatment of mas... | hmcode-2020: improved modelling of non-linear cosmological power spectra with baryonic feedback |
we introduce a new technique to search for gravitational wave events from compact binary mergers that produce a clear signal only in a single gravitational wave detector, and marginal signals in other detectors. such a situation can arise when the detectors in a network have different sensitivities, or when sources hav... | detecting gravitational waves with disparate detector responses: two new binary black hole mergers |
context. the explosion of observational data on exoplanets gives many constraints on theoretical models of planet formation and evolution. observational data probe very large areas of the parameter space and many different planet properties.aims: comparing theoretical models with observations allows one to take a key s... | the new generation planetary population synthesis (ngpps). i. bern global model of planet formation and evolution, model tests, and emerging planetary systems |
we present the first part of our disks around t tauri stars with sphere (dartts-s) survey: observations of eight t tauri stars that were selected based on their strong (sub)millimeter excesses using sphere/irdis polarimetric differential imaging in the j and h bands. all observations successfully detect the disks, whic... | disks around t tauri stars with sphere (dartts-s). i. sphere/irdis polarimetric imaging of eight prominent t tauri disks |
we use cosmological simulations to study a characteristic evolution pattern of high-redshift galaxies. early, stream-fed, highly perturbed, gas-rich discs undergo phases of dissipative contraction into compact, star-forming systems (`blue' nuggets) at z ∼ 4-2. the peak of gas compaction marks the onset of central gas d... | compaction and quenching of high-z galaxies in cosmological simulations: blue and red nuggets |
an accurate and precise kepler stellar properties catalog is essential for the interpretation of the kepler exoplanet survey results. previous kepler stellar properties catalogs have focused on reporting the best-available parameters for each star, but this has required combining data from a variety of heterogeneous so... | the gaia-kepler stellar properties catalog. i. homogeneous fundamental properties for 186,301 kepler stars |
we report a new analysis of the hubble frontier fields clusters abell 2744 and macs 0416 using wavelet decomposition to remove the cluster light, enabling the detection of highly magnified (>50×) galaxies a factor of 10× fainter in luminosity than previous studies. we find 167 galaxies at z≳ 6, and with this sample ... | directly observing the galaxies likely responsible for reionization |
the discovery of a fast radio burst (frb) in our galaxy associated with a magnetar (neutron star with strong magnetic field) has provided a critical piece of information to help us finally understand these enigmatic transients. we show that the volumetric rate of galactic-frb like events is consistent with the faint en... | a unified picture of galactic and cosmological fast radio bursts |
characterizing the relationship between stars, gas, and metals in galaxies is a critical component of understanding the cosmic baryon cycle. we compile contemporary censuses of the baryons in collapsed structures and their chemical makeup and dust content. we show the following: the [formula: see text] mass density of ... | the cosmic baryon and metal cycles |
we present a first-look analysis of the jwst ero data in the smacs j0723.3-7327 cluster field. we begin by reporting 10 new spectroscopic redshifts from λobs = 1.8-5.2 μm nirspec medium-resolution (r = λ/δλ = 1000) data. these are determined via multiple high-snr emission line detections with five objects at 1 < z &... | a first look at the smacs0723 jwst ero: spectroscopic redshifts, stellar masses, and star-formation histories |
context. many of the open clusters listed in modern catalogues were initially reported by visual astronomers as apparent overdensities of bright stars. as observational techniques and analysis methods continue to improve, some of them have been shown to be chance alignments of stars and not true clusters. recent public... | clusters and mirages: cataloguing stellar aggregates in the milky way |
the extremely rapid assembly of the earliest galaxies during the first billion years of cosmic history is a major challenge for our understanding of galaxy formation physics1-5. the advent of the james webb space telescope (jwst) has exacerbated this issue by confirming the existence of galaxies in substantial numbers ... | a massive quiescent galaxy at redshift 4.658 |
several lines of evidence suggest that the milky way underwent a major merger at z ~ 2 with the gaia-sausage-enceladus (gse) galaxy. here we use h3 survey data to argue that gse entered the galaxy on a retrograde orbit based on a population of highly retrograde stars with chemistry similar to the largely radial gse deb... | reconstructing the last major merger of the milky way with the h3 survey |
studies of galaxy surveys in the context of the cold dark matter paradigm have shown that the mass of the dark matter halo and the total stellar mass are coupled through a function that varies smoothly with mass. their average ratio mhalo/mstars has a minimum of about 30 for galaxies with stellar masses near that of th... | a galaxy lacking dark matter |
a fundamental quest of modern astronomy is to locate the earliest galaxies and study how they influenced the intergalactic medium a few hundred million years after the big bang1-3. the abundance of star-forming galaxies is known to decline4,5 from redshifts of about 6 to 10, but a key question is the extent of star for... | the onset of star formation 250 million years after the big bang |
it is generally believed that long-duration gamma-ray bursts (grbs) are associated with massive star core collapse1, whereas short-duration grbs are associated with mergers of compact star binaries2. however, growing observations3-6 have suggested that oddball grbs do exist, and several criteria (prompt emission proper... | a long-duration gamma-ray burst with a peculiar origin |
variable accretion in young stellar objects reveals itself photometrically and spectroscopically over a continuum of timescales and amplitudes. most dramatic are the large outbursts (e.g., fu ori, v1647 ori, and ex lup type events), but more frequent are the less coherent, smaller burst-like variations in accretion rat... | accretion variability as a guide to stellar mass assembly |
context. the carmenes survey is a high-precision radial velocity (rv) programme that aims to detect earth-like planets orbiting low-mass stars.aims: we develop least-squares fitting algorithms to derive the rvs and additional spectral diagnostics implemented in the spectrum radial velocity analyser (serval), a publicly... | spectrum radial velocity analyser (serval). high-precision radial velocities and two alternative spectral indicators |
we present a self-consistent, absolute isochronal age scale for young ( ≲ 200 myr), nearby ( ≲ 100 pc) moving groups in the solar neighbourhood based on homogeneous fitting of semi-empirical pre-main-sequence model isochrones using the τ2 maximum-likelihood fitting statistic of naylor & jeffries in the mv, v - j co... | a self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood |
we describe the dark energy survey (des) photometric data set assembled from the first three years of science operations to support des year 3 cosmologic analyses, and provide usage notes aimed at the broad astrophysics community. y3 gold improves on previous releases from des, y1 gold, and data release 1 (des dr1), pr... | dark energy survey year 3 results: photometric data set for cosmology |
we investigate the impact of uncertainty in the metallicity-specific star formation rate over cosmic time on predictions of the rates and masses of double compact object mergers observable through gravitational waves. we find that this uncertainty can change the predicted detectable merger rate by more than an order of... | the effect of the metallicity-specific star formation history on double compact object mergers |
we discuss the mass-radius diagram for static neutron star models obtained by the numerical solution of modified tolman-oppenheimer-volkoff equations in f (r ) gravity where the lagrangians f (r )=r +α r2(1 +γ r ) and f (r )=r1 +ɛ are adopted. unlike the case of the perturbative approach previously reported, the soluti... | mass-radius relation for neutron stars in f (r ) gravity |
we present a series of high-resolution echelle spectra of sn 2023ixf in m101, obtained nightly during the first week or so after discovery using pepsi on the large binocular telescope. na i d absorption in these spectra indicates a host reddening of e(b - v) = 0.031 mag and a systemic velocity of +7 km s-1 relative to ... | high-resolution spectroscopy of sn 2023ixf's first week: engulfing the asymmetric circumstellar material |
the angular momentum (am) evolution of stellar interiors, along with the resulting rotation rates of stellar remnants, remains poorly understood. asteroseismic measurements of red giant stars reveal that their cores rotate much faster than their surfaces, but much slower than theoretically predicted, indicating an unid... | slowing the spins of stellar cores |
the vertical structure and dynamics of stars in our local galactic neighbourhood contains much information about the local distribution of visible and dark matter and of perturbations to the milky way disc. we use data on the positions and velocities of stars in the solar neighbourhood from gaia data release 2 (dr2) an... | vertical waves in the solar neighbourhood in gaia dr2 |
we use accurate estimates of aluminium abundance from the apogee data release 17 and gaia early data release 3 astrometry to select a highly pure sample of stars with metallicity -1.5 ≲ [fe/h] ≲ 0.5 born in-situ in the milky way proper. the low-metallicity ([fe/h] ≲ -1.3) in-situ component we dub aurora is kinematicall... | from dawn till disc: milky way's turbulent youth revealed by the apogee+gaia data |
we examine in greater detail the recent proposal of using superconductors for detecting dark matter as light as the warm dark matter limit of o (kev). detection of suc light dark matter is possible if the entire kinetic energy of the dark matter is extracted in the scattering, and if the experiment is sensitive to o (m... | detecting superlight dark matter with fermi-degenerate materials |
we analyse the physical properties of a large, homogeneously selected sample of alma-located sub-millimetre galaxies (smgs). this survey, as2uds, identified 707 smgs across the ∼1 deg2 field, including ∼17 per cent, which are undetected at k ≳ 25.7 mag. we interpret their ultraviolet-to-radio data using magphys and det... | an alma survey of the scuba-2 cls uds field: physical properties of 707 sub-millimetre galaxies |
six gravitational wave events have been reported by the ligo-virgo collaboration (lvc), five of them associated with black hole binary (bhb) mergers and one with a double neutron star (dns) merger, while the coalescence of a black hole-neutron star (bhns) binary is still missing. we investigate the progenitors of doubl... | the progenitors of compact-object binaries: impact of metallicity, common envelope and natal kicks |
the direct detection of gravitational waves (gws) is an invaluable new tool to probe gravity and the nature of cosmic acceleration. a large class of scalar-tensor theories predicts that gws propagate with velocity different than the speed of light, a difference that can be o (1 ) for many models of dark energy. we dete... | speed of gravitational waves and the fate of scalar-tensor gravity |
the age of gravitational-wave astronomy has begun, and black hole (bh) mergers detected by the laser interferometer gravitational-wave observatory (ligo) are providing novel constraints on massive star evolution. a major uncertainty in stellar theory is the angular momentum (am) transport within the star that determine... | most black holes are born very slowly rotating |
the interplay between cosmic gas accretion on to galaxies and galaxy mergers drives the observed morphological diversity of galaxies. by comparing the state-of-the-art hydrodynamical cosmological simulations horizon-agn and horizon-noagn, we unambiguously identify the critical role of active galactic nuclei (agn) in se... | the horizon-agn simulation: morphological diversity of galaxies promoted by agn feedback |
extending prior work by pankow et al, we introduce rift, an algorithm to perform rapid parameter inference on gravitational wave sources via iterative fitting. we demonstrate this approach can correctly recover the parameters of coalescing compact binary systems, using detailed comparisons of rift to the well-tested la... | rapid and accurate parameter inference for coalescing, precessing compact binaries |
the combined detection of a binary neutron star merger in both gravitational waves (gws) and electromagnetic (em) radiation spanning the entire spectrum - gw170817/at2017gfo/grb170817a - marks a breakthrough in the field of multimessenger astronomy. between the plethora of modelling and observations, the rich synergy t... | multimessenger bayesian parameter inference of a binary neutron star merger |
we present the ultraviolet luminosity function and an estimate of the cosmic star formation rate density at 8 < z < 13 derived from deep nircam observations taken in parallel with the miri deep survey of the hubble ultra deep field (hudf), nircam covering the parallel field 2. our deep (40 hr) nircam observations... | life beyond 30: probing the -20 < m uv < -17 luminosity function at 8 < z < 13 with the nircam parallel field of the miri deep survey |
one bottleneck for the exploitation of data from the kepler mission for stellar astrophysics and exoplanet research has been the lack of precise radii and evolutionary states for most of the observed stars. we report revised radii of 177,911 kepler stars derived by combining parallaxes from the gaia data release 2 with... | revised radii of kepler stars and planets using gaia data release 2 |
in this work, we study the prospect of detecting the stochastic gravitational-wave background with the tianqin observatory. we consider sources of both astrophysical and cosmological origin, including stellar-mass binary black holes, binary neutron stars, galactic white dwarves, inflation, first-order phase transitions... | science with the tianqin observatory: preliminary results on stochastic gravitational-wave background |
in this study, we follow up our recent paper (monteiro et al. 2020) and present a homogeneous sample of fundamental parameters of open clusters in our galaxy, entirely based on gaia dr2 data. we used published membership probability of the stars derived from gaia dr2 data and applied our isochrone fitting code, updated... | updated parameters of 1743 open clusters based on gaia dr2 |
we review the impact of nuclear forces on matter at neutron-rich extremes. recent results have shown that neutron-rich nuclei become increasingly sensitive to three-nucleon forces, which are at the forefront of theoretical developments based on effective field theories of quantum chromodynamics. these developments incl... | nuclear forces and their impact on neutron-rich nuclei and neutron-rich matter |
results from the kepler mission indicate that the occurrence rate of small planets (<3 r ⊕) in the habitable zone of nearby low-mass stars may be as high as 80%. despite this abundance, probing the conditions and atmospheric properties on any habitable-zone planet is extremely difficult and has remained elusive to d... | water vapor and clouds on the habitable-zone sub-neptune exoplanet k2-18b |
we report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (bh). we used the hubble space telescope (hst) to carry out precise astrometry of the source star of the long-duration (t e ≃ 270 days), high-magnification microlensing event moa-2011-blg-191/ogle-2011-blg-0462 (hereaf... | an isolated stellar-mass black hole detected through astrometric microlensing |
how black holes consume and eject matter has been the subject of intense studies for more than 60 years. the luminosity of these systems are often compared to the eddington limit, the border at which the spherical accretion is inhibited by the radiation pressure of photons it produces. the discovery of ultraluminous x-... | astronomical puzzle cyg x-3 is a hidden galactic ultraluminous x-ray source |
the millisecond-duration radio flashes known as fast radio bursts (frbs) represent an enigmatic astrophysical phenomenon. recently, the sub-arcsecond localization (∼100 mas precision) of frb 121102 using the very large array has led to its unambiguous association with persistent radio and optical counterparts, and to t... | the repeating fast radio burst frb 121102 as seen on milliarcsecond angular scales |
clusters of galaxies are the most massive gravitationally bound objects in the universe and are still forming. they are thus important probes of cosmological parameters and many astrophysical processes. however, knowledge of the dynamics of the pervasive hot gas, the mass of which is much larger than the combined mass ... | the quiescent intracluster medium in the core of the perseus cluster |
we conduct a systematic tidal disruption event (tde) demographics analysis using the largest sample of optically selected tdes. a flux-limited, spectroscopically complete sample of 33 tdes is constructed using the zwicky transient facility over 3 yr (from 2018 october to 2021 september). we infer the black hole (bh) ma... | tidal disruption event demographics with the zwicky transient facility: volumetric rates, luminosity function, and implications for the local black hole mass function |
we present ias15, a 15th-order integrator to simulate gravitational dynamics. the integrator is based on a gauß-radau quadrature and can handle conservative as well as non-conservative forces. we develop a step-size control that can automatically choose an optimal timestep. the algorithm can handle close encounters and... | ias15: a fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits |
a transient gravitational-wave signal, gw150914, was identified in the twin advanced ligo detectors on 2015 september 2015 at 09:50:45 utc. to assess the implications of this discovery, the detectors remained in operation with unchanged configurations over a period of 39 days around the time of the signal. at the detec... | the rate of binary black hole mergers inferred from advanced ligo observations surrounding gw150914 |
we assemble a catalogue of candidate sagittarius stream members with 5d and 6d phase-space information, using astrometric data from gaia dr2, distances estimated from rr lyrae stars, and line-of-sight velocities from various spectroscopic surveys. we find a clear misalignment between the stream track and the direction ... | tango for three: sagittarius, lmc, and the milky way |
we summarize the determination of some neutrino properties from the global analysis of solar, atmospheric, reactor, and accelerator neutrino data in the framework of three-neutrino mixing as well as in some extended scenarios such as the mixing with ev-scale sterile neutrinos invoked for the interpretation of the short... | global analyses of neutrino oscillation experiments |
context. gaia has been in operations since 2014, and two full data releases (dr) have been delivered so far: dr1 in 2016 and dr2 in 2018. the third gaia data release expands from the early data release (edr3) in 2020, which contained the five-parameter astrometric solution and mean photometry for 1.8 billion sources by... | gaia data release 3. summary of the variability processing and analysis |
we report the discovery of 47 low surface brightness objects in deep images of a 3° × 3° field centered on the coma cluster, obtained with the dragonfly telephoto array. the objects have central surface brightness μ(g, 0) ranging from 24-26 mag arcsec-2 and effective radii r eff = 3''-10'', as measured from archival ca... | forty-seven milky way-sized, extremely diffuse galaxies in the coma cluster |
the neutrino fast flavor instability (ffi) can change neutrino flavor on time scales of nanoseconds and length scales of centimeters. it is expected to be ubiquitous in core-collapse supernovae and neutron star mergers, potentially modifying the neutrino signal we see, how matter is ejected from these explosions, and t... | fast flavor transformations |
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