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the uncertainties in neutron star radii and crust properties due to our limited knowledge of the equation of state are quantitatively analyzed. we first demonstrate the importance of a unified microscopic description for the different baryonic densities of the star. if the pressure functional is obtained matching a cru... | neutron star radii and crusts: uncertainties and unified equations of state |
context. recent years have seen building evidence that planet formation starts early, in the first ~0.5 myr. studying the dust masses available in young disks enables us to understand the origin of planetary systems given that mature disks are lacking the solid material necessary to reproduce the observed exoplanetary ... | dust masses of young disks: constraining the initial solid reservoir for planet formation |
about 10 μs after the big bang, the universe was filled—in addition to photons and leptons—with strong-interaction matter consisting of quarks and gluons, which transitioned to hadrons at temperatures close to kt = 150 mev and densities several times higher than those found in nuclei. this quantum chromodynamics (qcd) ... | probing dense baryon-rich matter with virtual photons |
massive black holes (mbhs) inhabit galactic centres, and power luminous quasars and active galactic nuclei, shaping their cosmic environment with the energy they produce. the origins of mbhs remain a mystery, and the recent detection by ligo/virgo of a black hole of almost 150 solar masses has revitalized the questions... | the origins of massive black holes |
hot subluminous stars of spectral type b and o are core helium-burning stars at the blue end of the horizontal branch or have evolved even beyond that stage. most hot subdwarf stars are chemically highly peculiar and provide a laboratory to study diffusion processes that cause these anomalies. the most obvious anomaly ... | hot subluminous stars |
our current knowledge of cosmic star-formation history during the first two billion years (corresponding to redshift z > 3) is mainly based on galaxies identified in rest-frame ultraviolet light1. however, this population of galaxies is known to under-represent the most massive galaxies, which have rich dust content... | a dominant population of optically invisible massive galaxies in the early universe |
numerical relativity (nr) simulations provide the most accurate binary black hole gravitational waveforms, but are prohibitively expensive for applications such as parameter estimation. surrogate models of nr waveforms have been shown to be both fast and accurate. however, nr-based surrogate models are limited by the t... | surrogate model of hybridized numerical relativity binary black hole waveforms |
the geometry of the accretion flow around stellar-mass black holes can change on timescales of days to months1-3. when a black hole emerges from quiescence (that is, it `turns on' after accreting material from its companion) it has a very hard (high-energy) x-ray spectrum produced by a hot corona4,5 positioned above it... | the corona contracts in a black-hole transient |
context. the gaia second data release provides precise astrometry and photometry for more than 1.3 billion sources. this catalog opens a new era concerning the characterization of open clusters and test stellar models, paving the way for better understanding of the disk properties.aims: the aim of the paper is to impro... | age determination for 269 gaia dr2 open clusters |
this paper discusses the transit model-fitting and multiple-planet search algorithms and performance of the kepler science data processing pipeline, developed by the kepler science operations center (soc). threshold crossing events (tces), which are transit candidate events, are generated by the transiting planet searc... | kepler data validation ii-transit model fitting and multiple-planet search |
context. this work is part of the gaia data processing and analysis consortium papers published with the gaia early data release 3 (edr3). it is one of the demonstration papers aiming to highlight the improvements and quality of the newly published data by applying them to a scientific case.aims: we use the gaia edr3 d... | gaia early data release 3. structure and properties of the magellanic clouds |
gravitational wave astronomy opened dramatically in september 2015 with the ligo discovery of a distant and massive binary black hole coalescence. the more recent discovery of a binary neutron star merger, followed by a gamma ray burst (grb) and a kilonova, reinforces the excitement of this new era, in which we may soo... | recent searches for continuous gravitational waves |
in a recent paper [1 p. v. p. cunha, c. a. r. herdeiro, e. radu, and h. f. runarsson, phys. rev. lett. 115, 211102 (2015).], it was shown that the lensing of light around rotating boson stars and kerr black holes with scalar hair can exhibit chaotic patterns. since no separation of variables is known (or expected) for ... | chaotic lensing around boson stars and kerr black holes with scalar hair |
the detection of a kilo/macronova electromagnetic counterpart (at 2017gfo) of the first gravitational-wave signal compatible with the merger of two neutron stars (gw170817) has confirmed the occurrence of r-process nucleosynthesis in this kind of event. the blue and red components of at 2017gfo have been interpreted as... | at 2017gfo: an anisotropic and three-component kilonova counterpart of gw170817 |
large surveys of galaxy clusters with the hubble space telescope (hst) and spitzer, including the cluster lensing and supernova survey with hubble and the frontier fields, have demonstrated the power of strong gravitational lensing to efficiently deliver large samples of high-redshift galaxies. we extend this strategy ... | relics: reionization lensing cluster survey |
the release of spin-down energy by a magnetar is a promising scenario to power several classes of extreme explosive transients. however, it lacks a firm basis because magnetar formation still represents a theoretical challenge. using the first three-dimensional simulations of a convective dynamo based on a protoneutron... | magnetar formation through a convective dynamo in protoneutron stars |
the short gamma-ray burst, grb 170817a, that followed the binary neutron star merger gravitational waves signal, gw170817, is not a usual short gamma-ray burst (sgrb). it is weaker by three orders of magnitude than the weakest sgrb seen before and its spectrum, showing a hard early signal followed by a softer thermal s... | a cocoon shock breakout as the origin of the γ-ray emission in gw170817 |
the radiation from stars and active galactic nuclei (agns) creates photodissociation regions (pdrs) and x-ray-dominated regions (xdrs), where the chemistry or heating is dominated by far-ultraviolet (fuv) radiation or x-ray radiation, respectively. pdrs include a wide range of environments, from the diffuse interstella... | photodissociation and x-ray-dominated regions |
the interstellar medium (ism) contains filamentary structure over a wide range of scales. understanding the role of this structure, both as a conduit of gas across the scales and a diagnostic tool of local physics, is a major focus of star formation studies. we review recent progress in studying filamentary structure i... | initial conditions for star formation: a physical description of the filamentary ism |
the ionizing photon escape fraction [lyman continuum (lyc) fesc] of star-forming galaxies is the single greatest unknown in the reionization budget. stochastic sightline effects prohibit the direct separation of lyc leakers from non-leakers at significant redshifts. here we circumvent this uncertainty by inferring fesc... | the synchrony of production and escape: half the bright lyα emitters at z ≈ 2 have lyman continuum escape fractions ≈50 per cent |
we report x-ray diffraction studies of the electronic ordering instabilities in the kagome material csv3sb5 as a function of temperature and applied magnetic field. our zero-field measurements between 10 and 120 k reveal an unexpected reorganization of the three-dimensional electronic order in the bulk of csv3sb5: at l... | temperature-driven reorganization of electronic order in csv3sb5 |
we propose a conceptual distinction between hard and soft realizations of deconfinement from nuclear to quark matter. in the high density region of hard deconfinement the repulsive hard cores of baryons overlap each other and bulk thermodynamics is dominated by the core properties that can be experimentally accessed in... | hard-core deconfinement and soft-surface delocalization from nuclear to quark matter |
stellar-mass primordial black holes (pbh) have been recently reconsidered as a dark matter (dm) candidate after the aligo discovery of several binary black hole (bh) mergers with masses of tens of m⊙ . matter accretion on such massive objects leads to the emission of high-energy photons, capable of altering the ionizat... | cmb bounds on disk-accreting massive primordial black holes |
multiple codes are available to derive atmospheric parameters and individual chemical abundances from high-resolution spectra of afgkm stars. almost all spectroscopists have their own preferences regarding which code and method to use. but the intrinsic differences between codes and methods lead to complex systematics ... | modern stellar spectroscopy caveats |
water and simple organic molecular ices dominate the mass of solid materials available for planetesimal and planet formation beyond the water snow line. here we analyze alma long baseline 2.9, 1.3 and 0.87 mm continuum images of the young star hl tau, and suggest that the emission dips observed are due to rapid pebble ... | evidence of fast pebble growth near condensation fronts in the hl tau protoplanetary disk |
galaxy observations are influenced by many physical parameters: stellar masses, star formation rates (sfrs), star formation histories (sfhs), metallicities, dust, black hole activity, and more. as a result, inferring accurate physical parameters requires high-dimensional models that capture or marginalize over this com... | an older, more quiescent universe from panchromatic sed fitting of the 3d-hst survey |
context. the gaia-eso public spectroscopic survey is an ambitious project designed to obtain astrophysical parameters and elemental abundances for 100 000 stars, including large representative samples of the stellar populations in the galaxy, and a well-defined sample of 60 (plus 20 archive) open clusters. we provide i... | the gaia-eso public spectroscopic survey: motivation, implementation, giraffe data processing, analysis, and final data products |
the apex telescope large area survey of the galaxy (atlasgal) is an unbiased 870 μm submillimetre survey of the inner galactic plane (|ℓ| < 60° with |b| < 1.5°). it is the largest and most sensitive ground-based submillimetre wavelength galactic survey to date and has provided a large and systematic inventory of ... | atlasgal - properties of a complete sample of galactic clumps |
studies of exoplanet demographics require large samples and precise constraints on exoplanet host stars. using the homogeneous kepler stellar properties derived using the gaia data release 2 by berger et al., we recompute kepler planet radii and incident fluxes and investigate their distributions with stellar mass and ... | the gaia-kepler stellar properties catalog. ii. planet radius demographics as a function of stellar mass and age |
we improve the current upper bound on the axion-photon coupling derived from stellar evolution using the r 2 parameter, the ratio of stellar populations on the asymptotic giant branch to horizontal branch in globular clusters. we compare this with data from simulations using the stellar evolution code mesa which includ... | advancing globular cluster constraints on the axion-photon coupling |
the relationship between stellar populations and the ionizing flux with which they irradiate their surroundings has profound implications for the evolution of the intergalactic medium (igm). we quantify the ionizing flux arising from synthetic stellar populations which incorporate the evolution of interacting binary st... | stellar population effects on the inferred photon density at reionization |
we present an atlas of ultraviolet and infrared images of ∼15,750 local (d ≲ 50 mpc) galaxies, as observed by nasa’s wide-field infrared survey explorer (wise) and galaxy evolution explorer (galex) missions. these maps have matched resolution (fwhm 7.″5 and 15″), matched astrometry, and a common procedure for backgroun... | a z = 0 multiwavelength galaxy synthesis. i. a wise and galex atlas of local galaxies |
accurate distances to local molecular clouds are critical for understanding the star and planet formation process, yet distance measurements are often obtained inhomogeneously on a cloud-by-cloud basis. we have recently developed a method that combines stellar photometric data with gaia dr2 parallax measurements in a b... | a compendium of distances to molecular clouds in the star formation handbook |
the σ orionis cluster is important for studying protoplanetary disk evolution, as its intermediate age (∼3-5 myr) is comparable to the median disk lifetime. we use alma to conduct a high-sensitivity survey of dust and gas in 92 protoplanetary disks around σ orionis members with m * ≳ 0.1 m ⊙. our observations cover the... | an alma survey of protoplanetary disks in the σ orionis cluster |
we present the simultaneous measurement of the interaction rates rp p, rbe, rp e p of p p , 7be, and p e p solar neutrinos performed with a global fit to the borexino data in an extended energy range (0.19-2.93) mev with particular attention to details of the analysis methods. this result was obtained by analyzing 1291... | simultaneous precision spectroscopy of p p , 7be, and p e p solar neutrinos with borexino phase-ii |
we explore hierarchical black hole (bh) mergers in nuclear star clusters (nscs), globular clusters (gcs) and young star clusters (yscs), accounting for both original and dynamically assembled binary bhs (bbhs). we find that the median mass of both first- and nth-generation dynamical mergers is larger in gcs and yscs wi... | hierarchical black hole mergers in young, globular and nuclear star clusters: the effect of metallicity, spin and cluster properties |
nasa’s kepler space telescope was designed to determine the frequency of earth-sized planets orbiting sun-like stars, but these planets are on the very edge of the mission’s detection sensitivity. accurately determining the occurrence rate of these planets will require automatically and accurately assessing the likelih... | identifying exoplanets with deep learning: a five-planet resonant chain around kepler-80 and an eighth planet around kepler-90 |
hot gas giant exoplanets can lose part of their atmosphere due to strong stellar irradiation, and these losses can affect their physical and chemical evolution. studies of atmospheric escape from exoplanets have mostly relied on space-based observations of the hydrogen lyman-α line in the far ultraviolet region, which ... | ground-based detection of an extended helium atmosphere in the saturn-mass exoplanet wasp-69b |
we present a set of 148 independent n-body simulations of globular clusters (gcs) computed using the code cmc (cluster monte carlo). at an age of ∼10-13 gyr, the resulting models cover nearly the full range of cluster properties exhibited by the milky way gcs, including total mass, core and half-light radii, metallicit... | modeling dense star clusters in the milky way and beyond with the cmc cluster catalog |
the redshifted 21 cm line is an emerging tool in cosmology, in principle permitting three-dimensional surveys of our universe that reach unprecedentedly large volumes, previously inaccessible length scales, and hitherto unexplored epochs of our cosmic timeline. large radio telescopes have been constructed for this purp... | data analysis for precision 21 cm cosmology |
over the past decades, rest-frame ultraviolet (uv) observations have provided large samples of uv luminous galaxies at redshift (z) greater than 6 (refs. 1-3), during the so-called epoch of reionization. while a few of these uv-identified galaxies revealed substantial dust reservoirs4-7, very heavily dust-obscured sour... | normal, dust-obscured galaxies in the epoch of reionization |
m dwarf stars, which have masses less than 60 per cent that of the sun, make up 75 per cent of the population of the stars in the galaxy. the atmospheres of orbiting earth-sized planets are observationally accessible via transmission spectroscopy when the planets pass in front of these stars. statistical results sugges... | a temperate rocky super-earth transiting a nearby cool star |
we perform long-term general relativistic neutrino radiation hydrodynamics simulations (in axisymmetry) for a massive neutron star (mns) surrounded by a torus, which is a canonical remnant formed after the binary neutron star merger. we take into account the effects of viscosity, which is likely to arise in the merger ... | mass ejection from the remnant of a binary neutron star merger: viscous-radiation hydrodynamics study |
we present predictions for neutron star tidal deformabilities obtained from a bayesian analysis of the nuclear equation of state, assuming a minimal model at high-density that neglects the possibility of phase transitions. the bayesian posterior probability distribution is constructed from priors obtained from microsco... | bayesian modeling of the nuclear equation of state for neutron star tidal deformabilities and gw170817 |
the monte carlo evaluation of path integrals is one of a few general purpose methods to approach strongly coupled systems. it is used in all branches of physics, from qcd and nuclear physics to the correlated electron systems. however, many systems of great importance (dense matter inside neutron stars, the repulsive h... | complex paths around the sign problem |
new spectroscopic surveys offer the promise of stellar parameters and abundances (“stellar labels”) for hundreds of thousands of stars; this poses a formidable spectral modeling challenge. in many cases, there is a subset of reference objects for which the stellar labels are known with high(er) fidelity. we take advant... | the cannon: a data-driven approach to stellar label determination |
the lyman continuum (lyc) cannot be observed at the epoch of reionization (z ≳ 6) owing to intergalactic h i absorption. to identify lyc emitters (lces) and infer the fraction of escaping lyc, astronomers have developed various indirect diagnostics of lyc escape. using measurements of the lyc from the low-redshift lyma... | the low-redshift lyman continuum survey. ii. new insights into lyc diagnostics |
compact object mergers: population astrophysics and statistics (compas; https://compas.science) is a public rapid binary population synthesis code. compas generates populations of isolated stellar binaries under a set of parameterized assumptions in order to allow comparisons against observational data sets, such as th... | rapid stellar and binary population synthesis with compas |
general relativistic magnetohydrodynamic (grmhd) simulations have revolutionized our understanding of black hole accretion. here, we present a gpu-accelerated grmhd code h-amr with multifaceted optimizations that, collectively, accelerate computation by 2-5 orders of magnitude for a wide range of applications. first, i... | h-amr: a new gpu-accelerated grmhd code for exascale computing with 3d adaptive mesh refinement and local adaptive time stepping |
exoplanets with substantial hydrogen/helium atmospheres have been discovered in abundance, many residing extremely close to their parent stars. the extreme irradiation levels that these atmospheres experience cause them to undergo hydrodynamic atmospheric escape. ongoing atmospheric escape has been observed to be occur... | atmospheric escape and the evolution of close-in exoplanets |
we consider the formation of binary black hole (bh) mergers through the evolution of field massive triple stars. in this scenario, favorable conditions for the inspiral of a bh binary are initiated by its gravitational interaction with a distant companion, rather than by a common-envelope phase invoked in standard bina... | binary black hole mergers from field triples: properties, rates, and the impact of stellar evolution |
the combined observation of gravitational and electromagnetic waves from the coalescence of two neutron stars marks the beginning of multimessenger astronomy with gravitational waves (gws). the development of accurate gravitational waveform models is a crucial prerequisite to extract information about the properties of... | matter imprints in waveform models for neutron star binaries: tidal and self-spin effects |
the explosion of ultra-stripped stars in close binaries can lead to ejecta masses <0.1 m⊙ and may explain some of the recent discoveries of weak and fast optical transients. in tauris et al., it was demonstrated that helium star companions to neutron stars (nss) may experience mass transfer and evolve into naked ∼1.... | ultra-stripped supernovae: progenitors and fate |
by compiling a comprehensive census of literature studies, we investigate the evolution of the main sequence (ms) of star-forming galaxies (sfgs) in the widest range of redshift (0 < z < 6) and stellar mass (108.5-1011.5 m⊙) ever probed. we convert all observations to a common calibration and find a remarkable co... | the main sequence of star-forming galaxies across cosmic times |
we present a new set of high-resolution hydrodynamic cosmological zoom-in simulations that apply the feedback in realistic environments physics to both local group (lg)-like and isolated milky way (mw)-like volumes (10 host systems in total with a baryonic particle mass ≃ 3500-7000 m_⊙). we study the stellar mass funct... | the local group on fire: dwarf galaxy populations across a suite of hydrodynamic simulations |
the latest observation of hl tau by alma revealed spectacular concentric dust rings in its circumstellar disk. we attempt to explain the multiple ring structure as a consequence of aggregate sintering. sintering is known to reduce the sticking efficiency of dust aggregates and occurs at temperatures slightly below the ... | sintering-induced dust ring formation in protoplanetary disks: application to the hl tau disk |
we describe the processing of the phangs-alma survey and present the phangs-alma pipeline, a public software package that processes calibrated interferometric and total power data into science-ready data products. phangs-alma is a large, high-resolution survey of co(2-1) emission from nearby galaxies. the observations ... | phangs-alma data processing and pipeline |
'hot super-earths' (or 'mini-neptunes') between one and four times earth's size with period shorter than 100 d orbit 30-50 per cent of sun-like stars. their orbital configuration - measured as the period ratio distribution of adjacent planets in multiplanet systems - is a strong constraint for formation models. here, w... | breaking the chains: hot super-earth systems from migration and disruption of compact resonant chains |
we combine high-resolution spectroscopic data from apogee-2 survey data release 16 (dr16) with broad-band photometric data from several sources as well as parallaxes from gaia data release 2 (dr2). using the bayesian isochrone-fitting code starhorse, we derived the distances, extinctions, and astrophysical parameters f... | from the bulge to the outer disc: starhorse stellar parameters, distances, and extinctions for stars in apogee dr16 and other spectroscopic surveys |
the hubble constant (h0 ) estimated from the local cepheid-supernova distance ladder is in 3 -σ tension with the value extrapolated from cosmic microwave background (cmb) data assuming the standard cosmological model. whether this tension represents new physics or systematic effects is the subject of intense debate. he... | prospects for resolving the hubble constant tension with standard sirens |
following our first detection reported in izotov et al., we present the detection of lyman continuum (lyc) radiation of four other compact star-forming galaxies observed with the cosmic origins spectrograph (cos) onboard the hubble space telescope. these galaxies, at redshifts of z ∼ 0.3, are characterized by high emis... | detection of high lyman continuum leakage from four low-redshift compact star-forming galaxies |
astrophysical black hole candidates are thought to be the kerr black holes of general relativity, but there is not yet direct observational evidence that the spacetime geometry around these objects is described by the kerr solution. the study of the properties of the electromagnetic radiation emitted by gas or stars or... | testing black hole candidates with electromagnetic radiation |
ground- and space-based planet searches employing radial velocity techniques and transit photometry have detected thousands of planet-hosting stars in the milky way. with so many planets discovered, the next step toward identifying potentially habitable planets is atmospheric characterization. while the sun-earth syste... | the muscles treasury survey. i. motivation and overview |
the direct detection of gravitational waves from merging binary black holes opens up a window into the environments in which binary black holes form. one signature of such environments is the angular distribution of the black hole spins. binary systems that formed through dynamical interactions between already-compact ... | distinguishing spin-aligned and isotropic black hole populations with gravitational waves |
we present the first systematic study of strong binary-single and binary-binary black hole (bh) interactions with the inclusion of general relativity. by including general relativistic effects in the equations of motion during strong encounters, the dissipation of orbital energy from the emission of gravitational waves... | eccentric black hole mergers in dense star clusters: the role of binary-binary encounters |
the observation of gravitational waves from an asymmetric binary opens the possibility for heavy neutron stars, but these pose challenges to models of the neutron star equation of state. we construct heavy neutron stars by introducing nontrivial structure in the speed of sound sourced by deconfined qcd matter, which ca... | neutron star equation of state in light of gw190814 |
we present the results of a search for high-redshift (z > 9) galaxy candidates in the jwst uncover survey, using deep nircam and niriss imaging in seven bands over ~45 arcmin2 and ancillary hubble space telescope (hst) observations. the nircam observations reach a 5σ limiting magnitude of ~29.2 ab. the identificatio... | jwst uncover: discovery of z > 9 galaxy candidates behind the lensing cluster abell 2744 |
in the present article, we have constructed a static charged anisotropic compact star model of einstein field equations for a spherically symmetric space-time geometry. specifically, we have extended the charged isotropic heintzmann solution to an anisotropic domain. to address this work, we have employed the gravitati... | charged anisotropic compact objects by gravitational decoupling |
the physical processes that establish the morphological evolution and the structural diversity of galaxies are key unknowns in extragalactic astrophysics. here we report the finding of the morphologically-mature galaxy jades-gs+53.18343-27.79097, which existed within the first 700 million years of the universe's histor... | inside-out growth in the early universe: a core in a vigorously star-forming disc |
we investigate the incidence and properties of ionized gas outflows in a sample of 52 galaxies with stellar mass between $10^7$ m$_{\odot}$ and $10^9$ m$_{\odot}$ observed with ultra-deep jwst/nirspec msa spectroscopy as part of the jwst advanced deep extragalactic survey (jades). the high-spectral resolution (r2700) n... | jades: the incidence rate and properties of galactic outflows in low-mass galaxies across 3 < z < 9 |
the detection of five new fast radio bursts (frbs) found in the 1.4-ghz high time resolution universe high-latitude survey at parkes, is presented. the rate implied is 7^{+5}_{-3}× 10^3 (95 per cent) frbs sky-1 d-1 above a fluence of 0.13 jy ms for an frb of 0.128 ms duration to 1.5 jy ms for 16 ms duration. one of the... | five new fast radio bursts from the htru high-latitude survey at parkes: first evidence for two-component bursts |
neutron matter is an intriguing nuclear system with multiple connections to condensed matter and astrophysics. considerable progress has been made over the past 20 years in exploring the properties of pure neutron fluids. we begin by reviewing research exploring the behavior of very low density neutron matter, which fo... | neutron matter from low to high density |
aims: recent observations by the atacama large millimeter/submillimeter array (alma) of disks around young stars revealed distinct asymmetries in the dust continuum emission. in this work we wish to study axisymmetric and non-axisymmetric structures that are generated by the magneto-rotational instability in the outer ... | gaps, rings, and non-axisymmetric structures in protoplanetary disks. from simulations to alma observations |
we present the densely sampled early light curve of the type ii supernova (sn) 2023ixf, first observed within hours of explosion in the nearby pinwheel galaxy (messier 101; 6.7 mpc). comparing these data to recently updated models of shock-cooling emission, we find that the progenitor likely had a radius of 410 ± 10 r ... | shock cooling and possible precursor emission in the early light curve of the type ii sn 2023ixf |
supernova (sn) explosions deposit prodigious energy and momentum in their environments, with the former regulating multiphase thermal structure and the latter regulating turbulence and star formation rates in the interstellar medium (ism). however, systematic studies quantifying the impact of sne in realistic inhomogen... | momentum injection by supernovae in the interstellar medium |
supermassive black hole feedback is thought to be responsible for the lack of star formation, or quiescence, in a significant fraction of galaxies. we explore how observable correlations between the specific star formation rate (ssfr), stellar mass (mstar), and black hole mass (mbh) are sensitive to the physics of blac... | the relationship between black hole mass and galaxy properties: examining the black hole feedback model in illustristng |
given that the macromolecular building blocks of life were likely produced photochemically in the presence of ultraviolet (uv) light, we identify some general constraints on which stars produce sufficient uv for this photochemistry. we estimate how much light is needed for the uv photochemistry by experimentally measur... | the origin of rna precursors on exoplanets |
we present the first results from the mapping obscuration to reionization with alma (mora) survey, the largest atacama large millimeter/submillimeter array (alma) blank-field contiguous survey to date (184 arcmin2) and the only at 2 mm to search for dusty star-forming galaxies (dsfgs). we use the 13 sources detected ab... | the evolution of the ir luminosity function and dust-obscured star formation over the past 13 billion years |
with jwst, new opportunities to study the evolution of galaxies in the early universe are emerging. spitzer constraints on rest-optical properties of z ≳ 7 galaxies demonstrated the power of using galaxy stellar masses and star formation histories (sfhs) to indirectly infer the cosmic star formation history. however, o... | on the ages of bright galaxies 500 myr after the big bang: insights into star formation activity at z ≳ 15 with jwst |
we describe updates to the redmapper algorithm, a photometric red-sequence cluster finder specifically designed for large photometric surveys. the updated algorithm is applied to 150 {{deg}}2 of science verification (sv) data from the dark energy survey (des), and to the sloan digital sky survey (sdss) dr8 photometric ... | the redmapper galaxy cluster catalog from des science verification data |
durgapal's fifth isotropic solution describing spherically symmetric and static matter distribution is extended to an anisotropic scenario. to do so we employ the gravitational decoupling through the minimal geometric deformation scheme. this approach allows to split einstein's field equations in two simply set of equa... | compact anisotropic models in general relativity by gravitational decoupling |
for the first ~3 yrs after the binary neutron star merger event gw 170817, the radio and x-ray radiation has been dominated by emission from a structured relativistic off-axis jet propagating into a low-density medium with n < 0.01 cm-3. we report on observational evidence for an excess of x-ray emission at δt > ... | evidence for x-ray emission in excess to the jet-afterglow decay 3.5 yr after the binary neutron star merger gw 170817: a new emission component |
we consider the problem of learning an unknown function $f_{\star}$ on the $d$-dimensional sphere with respect to the square loss, given i.i.d. samples $\{(y_i,{\boldsymbol x}_i)\}_{i\le n}$ where ${\boldsymbol x}_i$ is a feature vector uniformly distributed on the sphere and $y_i=f_{\star}({\boldsymbol x}_i)+\varepsil... | linearized two-layers neural networks in high dimension |
can a dynamically robust bosonic star (bs) produce an (effective) shadow that mimics that of a black hole (bh)? we focus on models of spherical bss with free scalar or vector fields, as well as with polynomial or axionic self-interacting fields. the bh shadow is linked to the existence of light rings (lrs). for free bo... | the imitation game: proca stars that can mimic the schwarzschild shadow |
this paper describes the data release of the sloan digital sky survey-ii (sdss-ii) supernova survey conducted between 2005 and 2007. light curves, spectra, classifications, and ancillary data are presented for 10,258 variable and transient sources discovered through repeat ugriz imaging of sdss stripe 82, a 300 deg2 ar... | the data release of the sloan digital sky survey-ii supernova survey |
we present an updated release of the basti (a bag of stellar tracks and isochrones) stellar model and isochrone library for a solar-scaled heavy element distribution. the main input physics that have been changed from the previous basti release include the solar metal mixture, electron conduction opacities, a few nucle... | the updated basti stellar evolution models and isochrones. i. solar-scaled calculations |
the most efficient axion production mechanism in a supernova (sn) core is the nucleon-nucleon bremsstrahlung. this process has been often modeled at the level of the vacuum one-pion exchange (ope) approximation. starting from this naive recipe, we revise the calculation including systematically different effects, namel... | improved axion emissivity from a supernova via nucleon-nucleon bremsstrahlung |
modern and future surveys effectively provide a panchromatic view for large numbers of extragalactic objects. consistently modeling these multiwavelength survey data is a critical but challenging task for extragalactic studies. the code investigating galaxy emission (cigale) is an efficient python code for spectral ene... | fitting agn/galaxy x-ray-to-radio seds with cigale and improvement of the code |
the neutron skin thickness δ rnp of heavy nuclei is essentially determined by the symmetry energy density slope l (ρ ) at ρc=0.11 fm−3≈2 /3 ρ0 (ρ0 is nuclear saturation density), roughly corresponding to the average density of finite nuclei. the prex collaboration recently reported a model-independent extraction of δ r... | constraints on the symmetry energy from prex-ii in the multimessenger era |
we introduce serra, a suite of zoom-in high-resolution ($1.2\times 10^4 \, {\rm m}_{\odot }$, $\simeq 25\, {\rm {pc}}$ at z = 7.7) cosmological simulations including non-equilibrium chemistry and on-the-fly radiative transfer. the outputs are post-processed to derive galaxy ultraviolet (uv) + far-infrared (fir) continu... | a survey of high-z galaxies: serra simulations |
according to the cpt theorem, which states that the combined operation of charge conjugation, parity transformation and time reversal must be conserved, particles and their antiparticles should have the same mass and lifetime but opposite charge and magnetic moment. here, we test cpt symmetry in a nucleus containing a ... | measurement of the mass difference and the binding energy of the hypertriton and antihypertriton |
gaia dr2 provides unprecedented precision in measurements of the distance and kinematics of stars in the solar neighborhood. through applying unsupervised machine learning on dr2's 5d data set (3d position + 2d velocity), we identify a number of clusters, associations, and comoving groups within 1 kpc and | b| < 30^... | untangling the galaxy. i. local structure and star formation history of the milky way |
we study the spatially resolved excitation properties of the ionized gas in a sample of 646 galaxies using integral field spectroscopy data from the sloan digital sky survey iv mapping nearby galaxies at apache point observatory (manga) programme. making use of baldwin-philips-terlevich diagnostic diagrams we demonstra... | sdss iv manga - spatially resolved diagnostic diagrams: a proof that many galaxies are liers |
we investigate the properties of haloes, galaxies and black holes to z = 0 in the high-resolution hydrodynamical simulation massiveblack-ii (mbii) which evolves a λ cold dark matter cosmology in a comoving volume vbox = (100 mpc h-1)3. mbii is the highest resolution simulation of this size which includes a self-consist... | the massiveblack-ii simulation: the evolution of haloes and galaxies to z ∼ 0 |
a review of solar cycle prediction methods and their performance is given, including early forecasts for cycle 25. the review focuses on those aspects of the solar cycle prediction problem that have a bearing on dynamo theory. the scope of the review is further restricted to the issue of predicting the amplitude (and o... | solar cycle prediction |
the phase-space structure of zero-temperature quarkyonic matter is a fermi sphere of quark matter surrounded by a shell of nucleonic matter. we construct a quasiparticle model of quarkyonic matter based on the constituent quark model, where the quark and nucleon masses are related by mq=mn/nc , and nc is the number of ... | dynamically generated momentum space shell structure of quarkyonic matter via an excluded volume model |
we present 294 pulsars found in gev data from the large area telescope (lat) on the fermi gamma-ray space telescope. another 33 millisecond pulsars (msps) discovered in deep radio searches of lat sources will likely reveal pulsations once phase-connected rotation ephemerides are achieved. a further dozen optical and/or... | the third fermi large area telescope catalog of gamma-ray pulsars |
the building of planetary systems is controlled by the gas and dust dynamics of protoplanetary disks. while the gas is simultaneously accreted onto the central star and dissipated away by winds, dust grains aggregate and collapse to form planetesimals and eventually planets. this dust and gas dynamics involves instabil... | hydro-, magnetohydro-, and dust-gas dynamics of protoplanetary disks |
planet formation theories predict that some planets may be ejected from their parent systems as result of dynamical interactions and other processes. unbound planets can also be formed through gravitational collapse, in a way similar to that in which stars form. a handful of free-floating planetary-mass objects have be... | no large population of unbound or wide-orbit jupiter-mass planets |
the recent detections of the binary black hole mergers gw150914 and gw151226 have inaugurated the field of gravitational-wave astronomy. for the two main formation channels that have been proposed for these sources, isolated binary evolution in galactic fields and dynamical formation in dense star clusters, the predict... | illuminating black hole binary formation channels with spins in advanced ligo |
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