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classification of stars, by comparing their optical spectra to a few dozen spectral standards, has been a workhorse of observational astronomy for more than a century. here, we extend this technique by compiling a library of optical spectra of 404 touchstone stars observed with keck/hires by the california planet searc... | precision stellar characterization of fgkm stars using an empirical spectral library |
since the discovery of neutron stars with masses around 2 {{m}⊙ } the composition of matter in the central part of these massive stars has been intensively discussed. within this paper we will (re)investigate the question of the appearance of hyperons. to that end we will perform an extensive parameter study within rel... | hyperons in neutron star matter within relativistic mean-field models |
while it is incontrovertible that the inner galaxy contains a bar, its structure near the galactic plane has remained uncertain, where extinction from intervening dust is greatest. we investigate here the galactic bar outside the bulge, the long bar, using red clump giant (rcg) stars from united kingdom infrared deep s... | the structure of the milky way's bar outside the bulge |
we derive bayesian distances for all stars in the radial velocity sample of gaia dr2, and use the statistical method of schönrich, binney & asplund to validate the distances and test the gaia parallaxes. in contrast to other methods, which rely on special sources, our method directly tests the distances to all star... | distances and parallax bias in gaia dr2 |
in this paper, we investigate how massive central galaxies cease their star formation by comparing theoretical predictions from cosmological simulations: eagle, illustris, and illustristng with observations of the local universe from the sloan digital sky survey (sdss). our machine learning (ml) classification reveals ... | on the quenching of star formation in observed and simulated central galaxies: evidence for the role of integrated agn feedback |
the solid content of circumstellar disks is inherited from the interstellar medium: dust particles of at most a micrometer in size. protoplanetary disks are the environment where these dust grains need to grow at least 13 orders of magnitude in size. our understanding of this growth process is far from complete, with d... | dust evolution and the formation of planetesimals |
we study the formation of planetesimals in protoplanetary disks from the gravitational collapse of solid over-densities generated via the streaming instability. to carry out these studies, we implement and test a particle-mesh self-gravity module for the athena code that enables the simulation of aerodynamically couple... | the mass and size distribution of planetesimals formed by the streaming instability. i. the role of self-gravity |
we present a new set of models for intermediate-mass asymptotic giant branch (agb) stars (4.0, 5.0, and 6.0 m⊙) at different metallicities (-2.15 ≤ [fe/h] ≤ +0.15). this set integrates the existing models for low-mass agb stars (1.3 ≤ m/m⊙ ≤ 3.0) already included in the fruity database. we describe the physical and che... | evolution, nucleosynthesis, and yields of agb stars at different metallicities. iii. intermediate-mass models, revised low-mass models, and the ph-fruity interface |
we present a new model of the nebular emission from star-forming galaxies in a wide range of chemical compositions, appropriate to interpret observations of galaxies at all cosmic epochs. the model relies on the combination of state-of-the-art stellar population synthesis and photoionization codes to describe the ensem... | modelling the nebular emission from primeval to present-day star-forming galaxies |
the low-energy electronic recoil spectrum in xenon1t provides an intriguing hint for potential new physics. at the same time, observations of horizontal branch stars favor the existence of a small amount of extra cooling compared to the one expected from the standard model particle content. in this note, we argue that ... | hidden photon dark matter in the light of xenon1t and stellar cooling |
this book is for anyone who owns, or is thinking of owning, a vixen star book ten telescope mount or its predecessor. a revolution in amateur astronomy has occurred in the past decade with the wide availability of high tech, computer-driven, go-to telescopes. vixen optics is leading the way by offering the star book te... | the vixen star book user guide: how to use the star book ten and the original star book |
double detonations in double white dwarf (wd) binaries undergoing unstable mass transfer have emerged in recent years as one of the most promising type ia supernova (sn ia) progenitor scenarios. one potential outcome of this “dynamically driven double-degenerate double-detonation” (d6) scenario is that the companion wd... | three hypervelocity white dwarfs in gaia dr2: evidence for dynamically driven double-degenerate double-detonation type ia supernovae |
the gravity instrument on the eso vlti pioneers the field of high-precision near-infrared interferometry by providing astrometry at the 10-100 μas level. measurements at this high precision crucially depend on the control of systematic effects. we investigate how aberrations introduced by small optical imperfections al... | improved gravity astrometric accuracy from modeling optical aberrations |
a comprehensive study of the atmospheric neutrino flux in the energy region from sub-gev up to several tev using the super-kamiokande (sk) water cherenkov detector is presented in this paper. the energy and azimuthal spectra, and variation over time, of the atmospheric νe+ν¯ e and νμ+ν¯μ fluxes are measured. the energy... | measurements of the atmospheric neutrino flux by super-kamiokande: energy spectra, geomagnetic effects, and solar modulation |
we introduce the astrid simulation, a large-scale cosmological hydrodynamic simulation in a $250 \, h^{-1}\mathrm{mpc}$ box with 2 × 55003 particles. astrid contains a large number of high redshift galaxies, which can be compared to future survey data, and resolves galaxies in haloes more massive than $2\times 10^9 \, ... | the astrid simulation: galaxy formation and reionization |
we present early-phase panchromatic photometric and spectroscopic coverage spanning the far-ultraviolet to near-infrared regime of the nearest hydrogen-rich core-collapse supernova (sn) in the last 25 yr, sn 2023ixf. we observe early "flash" features in the optical spectra due to confined dense circumstellar material (... | far-ultraviolet to near-infrared observations of sn 2023ixf: a high-energy explosion engulfed in complex circumstellar material |
the galactic bulge can uniquely be studied from large samples of individual stars and is therefore of prime importance for understanding the stellar population structure of bulges in general. here the observational evidence on the kinematics, chemical composition, and ages of bulge stellar populations based on photomet... | chemodynamical history of the galactic bulge |
we present the physical extent of [c ii] 158 μm line-emitting gas from 46 star-forming galaxies at z = 4-6 from the alma large program to investigate c ii at early times (alpine). using exponential profile fits, we measure the effective radius of the [c ii] line (${r}_{{\rm{e}},[{\rm{c}}{\rm\small{ii}}]}$) for individu... | the alpine-alma [c ii] survey: size of individual star-forming galaxies at z = 4-6 and their extended halo structure |
there are a number of observational hints from astrophysics which point to the existence of stellar energy losses beyond the ones accounted for by neutrino emission. these excessive energy losses may be explained by the existence of a new sub-kev mass pseudoscalar nambu-goldstone boson with tiny couplings to photons, e... | stellar recipes for axion hunters |
we report the discovery of 854 ultra-diffuse galaxies (udgs) in the coma cluster using deep r band images, with partial b, i, and hα band coverage, obtained with the subaru telescope. many of them (332) are milky way (mw) sized with very large effective radii of {r}{e}\gt 1.5 {kpc}. this study was motivated by the rece... | approximately a thousand ultra-diffuse galaxies in the coma cluster |
we investigate the stellar populations for a sample of 24 quiescent galaxies at 1.5 < z < 2.5 using deep rest-frame optical spectra obtained with keck mosfire. by fitting templates simultaneously to the spectroscopic and photometric data and exploring a variety of star formation histories, we obtain robust measur... | mosfire spectroscopy of quiescent galaxies at 1.5 < z < 2.5. ii. star formation histories and galaxy quenching |
understanding the formation and evolution of the stellar-mass binary black holes discovered by ligo and virgo is a challenge that spans many areas of astrophysics, from stellar evolution, dynamics and accretion disks, to possible exotic early universe processes. over the final years of their lives, stellar-mass binarie... | the last three years: multiband gravitational-wave observations of stellar-mass binary black holes |
in the present article, we have obtained a new solution for the charged compact star model through the gravitational decoupling (gd) by using a complete geometric deformation (cgd) approach (ovalle, phys lett b 788:213, 2019). in this approach, the initial decoupled system is separated into two subsystems namely einste... | extended gravitational decoupling (gd) solution for charged compact star model |
we present the results of the gould’s belt distances survey of young star-forming regions toward the orion molecular cloud complex. we detected 36 young stellar objects (ysos) with the very large baseline array, 27 of which have been observed in at least three epochs over the course of two years. at least half of these... | the gould’s belt distances survey (gobelins) ii. distances and structure toward the orion molecular clouds |
pebbles of millimeter sizes are abundant in protoplanetary discs around young stars. chondrules inside primitive meteorites - formed by melting of dust aggregate pebbles or in impacts between planetesimals - have similar sizes. the role of pebble accretion for terrestrial planet formation is nevertheless unclear. here ... | a pebble accretion model for the formation of the terrestrial planets in the solar system |
gaussian states have played an important role in the physics of continuous-variable quantum systems. they are appealing for the experimental ease with which they can be produced, and for their compact and elegant mathematical description. nevertheless, many proposed quantum technologies require us to go beyond the real... | non-gaussian quantum states and where to find them |
experiments on bilayer graphene unveiled a fascinating realization of stacking disorder where triangular domains with well-defined bernal stacking are delimited by a hexagonal network of strain solitons. here we show by means of numerical simulations that this is a consequence of a structural transformation of the moir... | structural and electronic transformation in low-angle twisted bilayer graphene |
multi-messenger observations of neutron star (ns) mergers have the potential to revolutionize nuclear astrophysics. they will improve our understanding of nucleosynthesis, provide insights about the equation of state (eos) of strongly interacting matter at high densities, and enable tests of the theory of gravity and o... | confronting gravitational-wave observations with modern nuclear physics constraints |
recent observations of neutron stars with gravitational waves and x-ray timing provide unprecedented access to the equation of state (eos) of cold dense matter at densities difficult to realize in terrestrial experiments. at the same time, predictions for the eos equipped with reliable uncertainty estimates from chiral... | direct astrophysical tests of chiral effective field theory at supranuclear densities |
the method of geometric deformation (mgd) is here employed to study compact stellar configurations, which are solutions of the effective einstein–dirac coupled field equations on fluid branes. non-linear, self-interacting, fermionic fields are then employed to derive mgd dirac stars, whose properties are analyzed and d... | mgd dirac stars |
we investigate the possibility that the low mass companion of the black hole in the source of gw190814 was a strange quark star. this possibility is viable within the so-called two-families scenario in which neutron stars and strange quark stars coexist. strange quark stars can reach the mass range indicated by gw19081... | was gw190814 a black hole-strange quark star system? |
the current theoretical development identified as the gravitational decoupling via complete geometric deformation (cgd) method that has been introduced to explore the nonmetricity q effects in relativistic astrophysics. in the present work, we have investigated the gravitationally decoupled anisotropic solutions for th... | anisotropic strange star model beyond standard maximum mass limit by gravitational decoupling in f(q)f(q) gravity |
we study an impact of self-interacting bosonic dark matter (dm) on various observable properties of neutron stars (nss). the analysis is performed for asymmetric dm with masses from few mev to gev, the self-coupling constant of order o (1 ) and various dm fractions. allowing a mixture between dm and baryonic matter, th... | bosonic dark matter in neutron stars and its effect on gravitational wave signal |
context. in the era of large galactic stellar surveys, carefully calibrating and validating the data sets has become an important and integral part of the data analysis. moreover, new generations of stellar atmosphere models and spectral line formation computations need to be subjected to benchmark tests to assess any ... | gaia fgk benchmark stars: effective temperatures and surface gravities |
we present models that predict spectra of old- and intermediate-aged stellar populations at 2.51 å (fwhm) with varying [α/fe] abundance. the models are based on the miles library and on corrections from theoretical stellar spectra. the models employ recent [mg/fe] determinations for the miles stars and basti scaled-sol... | evolutionary stellar population synthesis with miles - ii. scaled-solar and α-enhanced models |
we present an analysis of [o i]63, [o iii]88, [n ii]122, and [c ii]158 far-infrared (fir) fine-structure line observations obtained with herschel/pacs, for ∼240 local luminous infrared galaxies (lirgs) in the great observatories all-sky lirg survey. we find pronounced declines ("deficits") of line-to-fir continuum emis... | a herschel/pacs far-infrared line emission survey of local luminous infrared galaxies |
the deformability of a compact object induced by a perturbing tidal field is encoded in the tidal love numbers, which depend sensibly on the object's internal structure. these numbers are known only for static, spherically-symmetric objects. as a first step to compute the tidal love numbers of a spinning compact star, ... | tidal deformations of a spinning compact object |
the asteroid terrestrial-impact last alert system (atlas) observes most of the sky every night in search of dangerous asteroids. its data are also used to search for photometric variability, where sensitivity to variability is limited by photometric accuracy. since each exposure spans 7.°6 corner to corner, variations ... | the atlas all-sky stellar reference catalog |
using the binary population and spectral synthesis code, bpass, we have calculated the rates, time-scales and mass distributions for binary black hole (bh) mergers as a function of metallicity. we consider these in the context of the recently reported first laser interferometer gravitational-wave observatory (ligo) eve... | bpass predictions for binary black hole mergers |
we constrain the hubble constant h0 using fast radio burst (frb) observations from the australian square kilometre array pathfinder (askap) and murriyang (parkes) radio telescopes. we use the redshift-dispersion measure ('macquart') relationship, accounting for the intrinsic luminosity function, cosmological gas distri... | a measurement of hubble's constant using fast radio bursts |
context. rr lyrae stars are excellent tracers of the oldest stars (ages ≳ 9-10 gyr) and standard candles for measuring the distance to stellar systems that are mainly composed of an old stellar population. the gaia third data release (dr3) publishes a catalogue of full-sky rr lyrae stars observed during the initial 34 ... | gaia data release 3. specific processing and validation of all-sky rr lyrae and cepheid stars: the rr lyrae sample |
the maximal arnowitt-deser-misner (adm) mass for (mini)boson stars (bss)—gravitating solitons of einstein's gravity minimally coupled to a free, complex, mass μ , klein-gordon field—is madmmax∼mpl2/μ . adding quartic self-interactions to the scalar field theory, described by the lagrangian li=λ |ψ |4 , the maximal adm ... | kerr black holes with self-interacting scalar hair: hairier but not heavier |
pair instability (pi) and pulsational pi prevent the formation of black holes (bhs) with mass ≳60 m⊙ from single star evolution. here, we investigate the possibility that bhs with mass in the pi gap form via stellar mergers and multiple stellar mergers, facilitated by dynamical encounters in young star clusters. we ana... | binary black holes in the pair instability mass gap |
we have performed ab initio neutrino radiation hydrodynamics simulations in three and two spatial dimensions (3d and 2d) of core-collapse supernovae from the same 15 m ⊙ progenitor through 440 ms after core bounce. both 3d and 2d models achieve explosions; however, the onset of explosion (shock revival) is delayed by ∼... | three-dimensional core-collapse supernova simulated using a 15 m ⊙ progenitor |
feedback from energy liberated by gas accretion on to black holes (bhs) is an attractive mechanism to explain the exponential cut-off at the massive end of the galaxy stellar mass function. most previous implementations of bh accretion in hydrodynamical simulations of galaxy formation have assumed that bhs grow at an a... | the impact of angular momentum on black hole accretion rates in simulations of galaxy formation |
several thousand core-collapse supernovae (ccsne) of different flavors have been discovered so far. however, identifying their progenitors has remained an outstanding open question in astrophysics. studies of sn host galaxies have proven to be powerful in providing constraints on the progenitor populations. in this pap... | the palomar transient factory core-collapse supernova host-galaxy sample. i. host-galaxy distribution functions and environment dependence of core-collapse supernovae |
mid-infrared (mid-ir) observations are powerful in identifying heavily obscured active galactic nuclei (agn) that have weak emission in other wavelengths. data from the mid-infrared instrument (miri) on board the james webb space telescope provides an excellent opportunity to perform such studies. we take advantage of ... | ceers key paper. vi. jwst/miri uncovers a large population of obscured agn at high redshifts |
the existence of localized, approximately stationary, lumps of the classical gravitational and electromagnetic field - geons - was conjectured more than half a century ago. if one insists on exact stationarity, topologically trivial configurations in electro-vacuum are ruled out by no-go theorems for solitons. but stat... | asymptotically flat scalar, dirac and proca stars: discrete vs. continuous families of solutions |
wide-field optical surveys have begun to uncover large samples of fast (trise ≲ 5 d), luminous (mpeak < -18), blue transients. while commonly attributed to the breakout of a supernova shock into a dense wind, the great distances to the transients of this class found so far have hampered detailed investigation of the... | the fast, luminous ultraviolet transient at2018cow: extreme supernova, or disruption of a star by an intermediate-mass black hole? |
the study of stellar surfaces can reveal information about the chemical composition, interior structure, and magnetic properties of stars. it is also critical to the detection and characterization of extrasolar planets, in particular those targeted in extreme precision radial velocity (eprv) searches, which must conten... | mapping stellar surfaces iii: an efficient, scalable, and open-source doppler imaging model |
we characterize mass, momentum, energy, and metal outflow rates of multiphase galactic winds in a suite of fire-2 cosmological 'zoom-in' simulations from the feedback in realistic environments (fire) project. we analyse simulations of low-mass dwarfs, intermediate-mass dwarfs, milky way-mass haloes, and high-redshift m... | characterizing mass, momentum, energy, and metal outflow rates of multiphase galactic winds in the fire-2 cosmological simulations |
we present the full public data release (pdr-2) of the vimos public extragalactic redshift survey (vipers), performed at the eso vlt. we release redshifts, spectra, cfhtls magnitudes and ancillary information (as masks and weights) for a complete sample of 86 775 galaxies (plus 4732 other objects, including stars and s... | the vimos public extragalactic redshift survey (vipers). full spectroscopic data and auxiliary information release (pdr-2) |
we present a suite of seven 3d supernova simulations of non-rotating low-mass progenitors using multigroup neutrino transport. our simulations cover single star progenitors with zero-age main-sequence masses between 9.6 and 12.5 m_⊙ and (ultra)stripped-envelope progenitors with initial helium core masses between 2.8 an... | three-dimensional simulations of neutrino-driven core-collapse supernovae from low-mass single and binary star progenitors |
recently there has been significant interest in the claim that dark matter axions gravitationally thermalize and form a bose-einstein condensate with a cosmologically long-range correlation. this has potential consequences for galactic scale observations. here we critically examine this claim. we point out that there i... | do dark matter axions form a condensate with long-range correlation? |
this paper describes a new publicly available codebase for modeling galaxy formation in a cosmological context, the “semi-analytic galaxy evolution” model, or sage for short.5 sage is a significant update to the 2006 model of croton et al. and has been rebuilt to be modular and customizable. the model will run on any n... | semi-analytic galaxy evolution (sage): model calibration and basic results |
we compare the predictions of horizon-agn, a hydrodynamical cosmological simulation that uses an adaptive mesh refinement code, to observational data in the redshift range 0 < z < 6. we study the reproduction, by the simulation, of quantities that trace the aggregate stellar-mass growth of galaxies over cosmic ti... | the horizon-agn simulation: evolution of galaxy properties over cosmic time |
in the current article, we study anisotropic spherically symmetric strange star under the background of f(r, t) gravity using the metric potentials of tolman-kuchowicz type (tolman in phys rev 55:364, 1939; kuchowicz in acta phys pol 33:541, 1968) as λ (r ) =ln(1 +a r2+b r4) and ν (r ) =b r2+2 lnc which are free from s... | anisotropic strange star with tolman-kuchowicz metric under f(r, t) gravity |
both the co(2-1) and co(1-0) lines are used to trace the mass of molecular gas in galaxies. translating the molecular gas mass estimates between studies using different lines requires a good understanding of the behaviour of the co(2-1)-to-co(1-0) ratio, r21. we compare new, high-quality co(1-0) data from the iram 30-m... | new constraints on the 12co(2-1)/(1-0) line ratio across nearby disc galaxies |
the past decade has seen significant progress in understanding galaxy formation and evolution using large-scale cosmological simulations. while these simulations produce galaxies in overall good agreement with observations, they employ different sub-grid models for galaxies and supermassive black holes (bhs). we invest... | supermassive black holes in cosmological simulations i: mbh - m⋆ relation and black hole mass function |
in certain models of a qcd axion, finite density corrections to the axion potential can result in the axion being sourced by large dense objects. there are a variety of ways to test this phenomenon, but perhaps the most surprising effect is that the axion can mediate forces between neutron stars that can be as strong a... | probing axions with neutron star inspirals and other stellar processes |
we present the survey strategy and early results of the “satellites around galactic analogs” (saga) survey. the saga survey’s goal is to measure the distribution of satellite galaxies around 100 systems analogous to the milky way down to the luminosity of the leo i dwarf galaxy ({m}r< -12.3). we define a milky way a... | the saga survey. i. satellite galaxy populations around eight milky way analogs |
we present the full catalog of young stellar objects (ysos) identified in the 18 molecular clouds surveyed by the spitzer space telescope “cores to disks” (c2d) and “gould belt” (gb) legacy surveys. using standard techniques developed by the c2d project, we identify 3239 candidate ysos in the 18 clouds, 2966 of which s... | young stellar objects in the gould belt |
we perform a comprehensive study of the x-ray emission from 70 transient sources that have been classified as tidal disruption events (tdes) in the literature. we explore the properties of these candidates, using nearly three decades of x-ray observations to quantify their properties and characteristics. we find that t... | new physical insights about tidal disruption events from a comprehensive observational inventory at x-ray wavelengths |
jwst is providing the unique opportunity to directly study feedback processes regulating star formation (sf) in early galaxies. the two $z>5$ quiescent systems (jades-gs-z7-01-qu and macs0417-z5bbg) detected so far show a recent starburst after which sf is suppressed. to clarify whether such quenching is due to supe... | can supernovae quench star formation in high-$z$ galaxies? |
the first detection of gravitational waves from a neutron star-neutron star (ns-ns) merger, gw170817, and the increasing number of observations of short gamma-ray bursts have greatly motivated studies of the origins of ns-ns and neutron star-black hole (ns-bh) binaries. we calculate the merger rates of ns-ns and ns-bh ... | on the rate of neutron star binary mergers from globular clusters |
the merger rate of stellar-mass black hole binaries (sbhbs) inferred by the advanced laser interferometer gravitational-wave observatory (ligo) suggests the need for an efficient source of sbhb formation. active galactic nucleus (agn) disks are a promising location for the formation of these sbhbs, as well as binaries ... | orbital migration of interacting stellar mass black holes in disks around supermassive black holes |
we present chandra and very large array observations of gw170817 at ∼521-743 days post-merger, and a homogeneous analysis of the entire chandra data set. we find that the late-time nonthermal emission follows the expected evolution of an off-axis relativistic jet, with a steep temporal decay {f}ν \propto {t}-1.95+/- 0.... | two years of nonthermal emission from the binary neutron star merger gw170817: rapid fading of the jet afterglow and first constraints on the kilonova fastest ejecta |
the overabundance of super-early (redshift $z>10$), luminous ($m_{\rm uv} < -20$), and blue galaxies detected by jwst has been explained (ferrara et al. 2023) as due to negligible dust attenuation in these systems. we show that such model correctly reproduces the uv luminosity function at $z>10$, and the star ... | super-early jwst galaxies, outflows and lyman alpha visibility in the eor |
a key outstanding question in star and planet formation is how far the initial mass function of stars and sub-stellar objects extends, and whether or not there is a cut-off at the very lowest masses. isolated objects in the planetary-mass domain below 13 jupiter masses, where not even deuterium can fuse, are very chall... | jupiter mass binary objects in the trapezium cluster |
we still do not understand how planets form or why extrasolar planetary systems are so different from our own solar system. however, the past few years have dramatically changed our view of the disks of gas and dust around young stars. observations with the atacama large millimeter/submillimeter array and extreme adapt... | kinematic detection of a planet carving a gap in a protoplanetary disk |
we study the gravitational wave (gw) signal from eight new 3d core-collapse supernova simulations. we show that the signal is dominated by f- and g-mode oscillations of the protoneutron star (pns) and its frequency evolution encodes the contraction rate of the latter, which, in turn, is known to depend on the star’s ma... | characterizing the gravitational wave signal from core-collapse supernovae |
in ligo’s o1 and o2 observational runs, the detectors were sensitive to stellar-mass binary black hole (bbh) coalescences with component masses up to 100 {m}⊙ , with binaries with primary masses above 40 {m}⊙representing ≳90% of the total accessible sensitive volume. nonetheless, of the 5.9 detections (gw150914, lvt151... | where are ligo’s big black holes? |
we present results of the largest, most comprehensive study ever done of the stellar multiplicity of the most common stars in the galaxy, the red dwarfs. we have conducted an all-sky volume-limited survey for stellar companions to 1120 m dwarf primaries known to lie within 25 pc of the sun via trigonometric parallaxes.... | the solar neighborhood. xlv. the stellar multiplicity rate of m dwarfs within 25 pc |
we utilise multi-epoch muse spectroscopy to study binary stars in the core of the galactic globular cluster ngc 3201. our sample consists of 3553 stars with 54 883 spectra in total comprising 3200 main-sequence stars up to 4 magnitudes below the turn-off. each star in our sample has between 3 and 63 (with a median of 1... | a stellar census in globular clusters with muse: binaries in ngc 3201 |
the ([α/fe], [fe/h]) distribution of milky way stars shows at least two distinct sequences, which have traditionally been associated with the thin and thick disc components. the abundance distribution varies systematically with location r and |z| across the galaxy. we reproduce this using an analytical chemodynamical m... | chemical enrichment and radial migration in the galactic disc - the origin of the [αfe] double sequence |
the final phase of the reionization process can be probed by rest-frame uv absorption spectra of quasars at z ≳ 6, shedding light on the properties of the diffuse intergalactic medium within the first gyr of the universe. the eso large programme 'xqr-30: the ultimate xshooter legacy survey of quasars at z ≃ 5.8-6.6' de... | xqr-30: the ultimate xshooter quasar sample at the reionization epoch |
the visibility of high-redshift lyman-alpha emitting galaxies (laes) provides important constraints on galaxy formation processes and the epoch of reionization (eor). however, predicting realistic and representative statistics for comparison with observations represents a significant challenge in the context of large-v... | the thesan project: lyman-α emission and transmission during the epoch of reionization |
e-astrogam (`enhanced astrogam') is a breakthrough observatory space mission, with a detector composed by a silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of the non-thermal universe in the photon energy range from 0.3 mev to 3 gev - the lower energy limit can be pushed to energie... | the e-astrogam mission. exploring the extreme universe with gamma rays in the mev - gev range |
the past decades have witnessed a lot of progress in gravitational lensing with two main targets: stars and galaxies (with active galactic nuclei). the success is partially attributed to the continuous luminescence of these sources making the detection and monitoring relatively easy. with the running of ongoing and upc... | strongly lensed transient sources: a review |
tidal disruption events (tdes) are bursts of electromagnetic energy that are released when supermassive black holes at the centres of galaxies violently disrupt a star that passes too close1. tdes provide a window through which to study accretion onto supermassive black holes; in some rare cases, this accretion leads t... | a very luminous jet from the disruption of a star by a massive black hole |
in this paper we study the possibility of having a wormhole (wh) as a candidate for the sgr a⋆ central object and test this idea by constraining their geometry using the motion of s2 star and the reconstructed shadow images. in particular, we consider three wh models, including whs in einstein theory, brane-world gravi... | constraining wormhole geometries using the orbit of s2 star and the event horizon telescope |
the polarization of fast radio bursts (frbs), which are bright astronomical transient phenomena, contains information about their environments. using wide-band observations with two telescopes, we report polarization measurements of five repeating frbs and find a trend of lower polarization at lower frequencies. this b... | frequency-dependent polarization of repeating fast radio bursts—implications for their origin |
planets orbiting m-dwarf stars are prime targets in the search for rocky exoplanet atmospheres. the small size of m dwarfs renders their planets exceptional targets for transmission spectroscopy, facilitating atmospheric characterization. however, it remains unknown whether their host stars' highly variable extreme-uv ... | high tide or riptide on the cosmic shoreline? a water-rich atmosphere or stellar contamination for the warm super-earth gj 486b from jwst observations |
the r-process nucleosynthesis in core-collapse supernovae (cc-sne) is studied, with a focus on the explosion scenario induced by rotation and strong magnetic fields. nucleosynthesis calculations are conducted based on magneto-hydrodynamical explosion models with a wide range of parameters for initial rotation and magne... | the r-process nucleosynthesis in the various jet-like explosions of magnetorotational core-collapse supernovae |
feedback from supermassive black holes (smbhs) is believed to be a critical driver of the observed quenching of star formation and color bimodality of galaxies above the milky way mass scale. in recent years, various forms of smbh feedback have been implemented as subgrid models in galaxy formation simulations, but mos... | formation of quenched massive galaxies in fire cosmological zoom-in simulations with multi-channel agn feedback |
abridged - stars with zams masses between 140 and $260 m_\odot$ are thought to explode as pair-instability supernovae (pisne). during their thermonuclear runaway, pisne can produce up to several tens of solar masses of radioactive nickel, resulting in luminous transients similar to some superluminous supernovae (slsne)... | 1100 days in the life of the supernova 2018ibb -- the best pair-instability supernova candidate, to date |
here we review present knowledge of the long-term behaviour of solar activity on a multi-millennial timescale, as reconstructed using the indirect proxy method. the concept of solar activity is discussed along with an overview of the dedicated indices used to quantify different aspects of variable solar activity, with ... | a history of solar activity over millennia |
we present possis, a time-dependent three-dimensional monte carlo code for modelling radiation transport in supernovae and kilonovae. the code incorporates wavelength- and time-dependent opacities, and predicts viewing-angle dependent spectra, light curves, and polarization for both idealized and hydrodynamical explosi... | possis: predicting spectra, light curves, and polarization for multidimensional models of supernovae and kilonovae |
we illustrate the formation and evolution of the milky way over cosmic time, utilizing a sample of 10 million red giant stars with full chemodynamical information, including metallicities and $\alpha$-abundances from low-resolution gaia xp spectra. the evolution of angular momentum as a function of metallicity - a roug... | the three-phase evolution of the milky way |
observed accretion rates onto the milky-way and other local spirals fall short of that required to sustain star formation for cosmological timescales. a potential avenue for this unseen accretion is an inflow in the volume-filling hot phase ($\sim10^6$ k) of the circumgalactic medium (cgm), as suggested by some cosmolo... | accretion onto disk galaxies via hot and rotating cgm inflows |
context. how galaxies form, assemble, and cease their star formation is a central question within the modern landscape of galaxy evolution studies. these processes are indelibly imprinted on the galaxy stellar mass function (smf), and its measurement and understanding is key to uncovering a unified theory of galaxy evo... | cosmos2020: the galaxy stellar mass function. the assembly and star formation cessation of galaxies at 0.2< z ≤ 7.5 |
in this work we study the properties of compact spheres made of a charged perfect fluid with a mit bag model eos for quark matter. considering static spherically symmetric spacetime we derive the hydrostatic equilibrium equations in the recently formulated four dimensional einstein-gauss-bonnet (4d egb) gravity theory.... | electrically charged quark stars in 4d einstein-gauss-bonnet gravity |
the laser interferometer space antenna1, lisa, will detect gravitational wave signals from extreme mass-ratio inspirals2, where a stellar mass compact object orbits a supermassive black hole and eventually plunges into it. here we report on lisa's capability to detect whether the smaller compact object in an extreme ma... | detecting fundamental fields with lisa observations of gravitational waves from extreme mass-ratio inspirals |
we present the atlas discovery and initial analysis of the first 18 days of the unusual transient event, atlas18qqn/at2018cow. it is characterized by a high peak luminosity (∼1.7 × 1044 erg s-1), rapidly evolving light curves (>5 mag rise to peak in ∼3.5 days), and hot blackbody spectra, peaking at ∼27,000 k that ar... | the cow: discovery of a luminous, hot, and rapidly evolving transient |
electrostatic analyzers of different designs have been used since the earliest days of the space age, beginning with the very earliest solar-wind measurements made by mariner 2 en route to venus in 1962. the parker solar probe (psp) mission, nasa’s first dedicated mission to study the innermost reaches of the heliosphe... | the solar probe analyzers—electrons on the parker solar probe |
we use the results from the alma large program aspecs, the spectroscopic survey in the hubble ultra deep field (hudf), to constrain co luminosity functions of galaxies and the resulting redshift evolution of ρ(h2). the broad frequency range covered enables us to identify co emission lines of different rotational transi... | the alma spectroscopic survey in the hudf: co luminosity functions and the molecular gas content of galaxies through cosmic history |
we calculate static and spherically symmetric solutions for the rastall modification of gravity to describe neutron stars (ns). the key feature of the rastall gravity is the nonconservation of the energy-momentum tensor proportionally to the space-time curvature. using realistic equations of state for the ns interior w... | neutron stars in rastall gravity |
we study the possibility that self-interacting bosonic dark matter forms star-like objects. we study both the case of attractive and repulsive self-interactions, and we focus particularly in the parameter phase space where self-interactions can solve well standing problems of the collisionless dark matter paradigm. we ... | boson stars from self-interacting dark matter |
we present cosmological parameter results from the final full-mission planck measurements of the cosmic microwave background (cmb) anisotropies, combining information from the temperature and polarization maps and the lensing reconstruction. compared to the 2015 results, improved measurements of large-scale polarizatio... | planck 2018 results. vi. cosmological parameters |
this paper presents cosmological results based on full-mission planck observations of temperature and polarization anisotropies of the cosmic microwave background (cmb) radiation. our results are in very good agreement with the 2013 analysis of the planck nominal-mission temperature data, but with increased precision. ... | planck 2015 results. xiii. cosmological parameters |
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