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we present high-resolution (0.″16) 870 μm atacama large millimeter/submillimeter array (alma) imaging of 16 luminous ({l}{ir}∼ 4× {10}12 {l}⊙ ) submillimeter galaxies (smgs) from the aless survey of the extended chandra deep field south. this dust imaging traces the dust-obscured star formation in these z∼ 2.5 galaxies... | kiloparsec-scale dust disks in high-redshift luminous submillimeter galaxies |
hydrogen lyman-α (lyα) emission has been one of the major observational probes for the high-redshift universe since the first discoveries of high-z lyα-emitting galaxies in the late 1990s. due to the strong lyα emission originated by resonant scattering and recombination of the most abundant element, lyα observations w... | observations of the lyman-α universe |
aims: metis is the first solar coronagraph designed for a space mission and is capable of performing simultaneous imaging of the off-limb solar corona in both visible and uv light. the observations obtained with metis aboard the solar orbiter esa-nasa observatory will enable us to diagnose, with unprecedented temporal ... | metis: the solar orbiter visible light and ultraviolet coronal imager |
gas kinematics are an important part of the planet formation process. turbulence influences planetesimal growth and migration from the scale of submicron dust grains through gas-giant planets. radio observations of resolved molecular line emission can directly measure this non-thermal motion and, taking advantage of th... | a three-dimensional view of turbulence: constraints on turbulent motions in the hd 163296 protoplanetary disk using dco+ |
we use asteroseismic data from the kepler satellite to determine fundamental stellar properties of the 66 main-sequence targets observed for at least one full year by the mission. we distributed tens of individual oscillation frequencies extracted from the time series of each star among seven modeling teams who applied... | standing on the shoulders of dwarfs: the kepler asteroseismic legacy sample. ii.radii, masses, and ages |
we explore star formation histories (sfhs) of galaxies based on the evolution of the star formation rate stellar mass relation (sfr-m*). using data from the fourstar galaxy evolution survey (zfourge) in combination with far-ir imaging from the spitzer and herschel observatories we measure the sfr-m* relation at 0.5 <... | the sfr-m* relation and empirical star-formation histories from zfourge* at 0.5 < z < 4 |
supermassive black holes are found at the centres of massive galaxies. during the growth of these black holes they light up to become visible as active galactic nuclei (agns) and release extraordinary amounts of energy across the electromagnetic spectrum. this energy is widely believed to regulate the rate of star form... | impact of supermassive black hole growth on star formation |
the kinematics of the milky way disc as a function of age are well measured at the solar radius, but have not been studied over a wider range of galactocentric radii. here, we measure the kinematics of mono-age, mono-[fe/h] populations in the low and high [α/fe] discs between 4 ≲ r ≲ 13 kpc and |z| ≲ 2 kpc using 65 719... | dynamical heating across the milky way disc using apogee and gaia |
in federated learning, a central server coordinates the training of a single model on a massively distributed network of devices. this setting can be naturally extended to a multi-task learning framework, to handle real-world federated datasets that typically show strong statistical heterogeneity among devices. despite... | variational federated multi-task learning |
most of the hydrogen in the intergalactic medium (igm) was rapidly ionized at high redshifts. while observations have established that reionization occurred, observational constraints on the high-redshift ionizing emissivity remain elusive. here, we present a new analysis of the low-redshift lyman continuum survey (lzl... | the far-ultraviolet continuum slope as a lyman continuum escape estimator at high redshift |
we analyse the first giant molecular cloud (gmc) simulation to follow the formation of individual stars and their feedback from jets, radiation, winds, and supernovae, using the starforge framework in the gizmo code. we evolve the gmc for $\sim 9 \rm myr$, from initial turbulent collapse to dispersal by feedback. proto... | the dynamics and outcome of star formation with jets, radiation, winds, and supernovae in concert |
we present a targeted search for continuous gravitational waves (gws) from 236 pulsars using data from the third observing run of ligo and virgo (o3) combined with data from the second observing run (o2). searches were for emission from the l = m = 2 mass quadrupole mode with a frequency at only twice the pulsar rotati... | searches for gravitational waves from known pulsars at two harmonics in the second and third ligo-virgo observing runs |
recent jwst/nircam imaging taken for the ultra-deep uncover program reveals a very red dropout object at z phot ≃ 7.6, triply imaged by the galaxy cluster a2744 (z d = 0.308). all three images are very compact, i.e., unresolved, with a delensed size upper limit of re≲ 35 pc. the images have apparent magnitudes of m f44... | jwst uncover: extremely red and compact object at z phot ≃ 7.6 triply imaged by a2744 |
the high-redshift intergalactic medium (igm) and the primeval galaxy population are rapidly becoming the new frontier of extragalactic astronomy. we investigate the igm properties and their connection to galaxies at z ≥ 5.5 under different assumptions for the ionizing photon escape and the nature of dark matter, employ... | the thesan project: properties of the intergalactic medium and its connection to reionization-era galaxies |
in recent years, 2d layered materials have received considerable research interest on account of their substantial material systems and unique physicochemical properties. among them, 2d layered transition metal dichalcogenides (tmds), a star family member, have already been explored over the last few years and have exh... | recent progress in cvd growth of 2d transition metal dichalcogenides and related heterostructures |
the coronal activity-rotation relationship is considered to be a proxy for the underlying stellar dynamo responsible for magnetic activity in solar and late-type stars. while this has been studied in considerable detail for partly convective stars that are believed to operate an interface dynamo, it is poorly unconstra... | the stellar rotation-activity relationship in fully convective m dwarfs |
electron and ion energization (i.e., heating and nonthermal acceleration) is a fundamental, but poorly understood, outcome of plasma turbulence. in this work, we present new results on this topic from particle-in-cell simulations of driven turbulence in collisionless, relativistic electron-ion plasma. we focus on tempe... | electron and ion energization in relativistic plasma turbulence |
nuclear star clusters surrounding supermassive black holes (smbhs) in galactic nuclei contain large numbers of stars, black holes (bhs), and neutron stars (nss), a fraction of which are likely to form binaries. these binaries were suggested to form a triple system with the smbh, which acts as a perturber and may enhanc... | black hole and neutron star mergers in galactic nuclei |
we use the observed properties of fast radio bursts (frbs) and a number of general physical considerations to provide a broad-brush model for the physical properties of frb sources and the radiation mechanism. we show that the magnetic field in the source region should be at least 1014 g. this strong field is required ... | fast radio burst source properties and curvature radiation model |
we present a suite of 15 cosmological zoom-in simulations of isolated dark matter haloes, all with masses of mhalo ≈ 1010 m⊙ at z = 0, in order to understand the relationship among halo assembly, galaxy formation and feedback's effects on the central density structure in dwarf galaxies. these simulations are part of th... | fire in the field: simulating the threshold of galaxy formation |
gravitational-wave astronomy has been firmly established with the detection of gravitational waves from the merger of ten stellar-mass binary black holes and a neutron star binary. this paper reports on the all-sky search for gravitational waves from intermediate mass black hole binaries in the first and second observi... | search for intermediate mass black hole binaries in the first and second observing runs of the advanced ligo and virgo network |
we study the gas phase metallicity (o/h) and nitrogen abundance gradients traced by star-forming regions in a representative sample of 550 nearby galaxies in the stellar mass range 109-1011.5 m⊙ with resolved spectroscopic data from the sloan digital sky survey iv mapping nearby galaxies at apache point observatory sur... | sdss iv manga - metallicity and nitrogen abundance gradients in local galaxies |
we trace the evolution of research on extreme solar and solar-terrestrial events from the 1859 carrington event to the rapid development of the last twenty years. our focus is on the largest observed/inferred/theoretical cases of sunspot groups, flares on the sun and sun-like stars, coronal mass ejections, solar proton... | extreme solar events |
the pencil code is a highly modular physics-oriented simulation code that can be adapted to a wide range of applications. it is primarily designed to solve partial differential equations (pdes) of compressible hydrodynamics and has lots of add-ons ranging from astrophysical magnetohydrodynamics (mhd) to meteorological ... | the pencil code, a modular mpi code for partial differential equations and particles: multipurpose and multiuser-maintained |
the james webb space telescope (jwst) discovered several luminous high-redshift galaxy candidates with stellar masses of m * ≳ 109 m ⊙ at photometric redshifts z phot ≳ 10, which allows to constrain galaxy and structure formation models. for example, adams et al. identified the candidate id 1514 with ${\mathrm{log}}_{1... | has jwst already falsified dark-matter-driven galaxy formation? |
we present and study a large suite of high-resolution cosmological zoom-in simulations, using the fire-2 treatment of mechanical and radiative feedback from massive stars, together with explicit treatment of magnetic fields, anisotropic conduction and viscosity (accounting for saturation and limitation by plasma instab... | but what about...: cosmic rays, magnetic fields, conduction, and viscosity in galaxy formation |
gravitational wave (gw) measurements will provide insight into the population of coalescing compact binaries throughout the universe. we describe and demonstrate a flexible parametric method to infer the event rate as a function of compact binary parameters, accounting for poisson error and selection biases. using synt... | reconstructing phenomenological distributions of compact binaries via gravitational wave observations |
a general theory of the onset and development of the plasmoid instability is formulated by means of a principle of least time. the scaling relations for the final aspect ratio, transition time to rapid onset, growth rate, and number of plasmoids are derived and shown to depend on the initial perturbation amplitude (ŵ ... | general theory of the plasmoid instability |
we present specific star formation rates (ssfrs) for 40 ultraviolet (uv)-bright galaxies at z ~ 7-8 observed as part of the reionization era bright emission line survey (rebels) atacama large millimeter/submillimeter array (alma) large programme. the ssfrs are derived using improved star formation rate (sfr) calibratio... | the alma rebels survey: specific star formation rates in the reionization era |
one proposed formation channel for stellar mass black holes (bhs) is through hierarchical mergers of smaller bhs. repeated mergers between comparable mass bhs leave an imprint on the spin of the resulting bh since the final bh spin is largely determined by the orbital angular momentum of the binary. we find that for st... | are ligo's black holes made from smaller black holes? |
we present detections of [o iii] λ4363 and direct-method metallicities for star-forming galaxies at z = 1.7-3.6. we combine new measurements from the mosfire deep evolution field (mosdef) survey with literature sources to construct a sample of 18 galaxies with direct-method metallicities at z > 1, spanning 7.5 < ... | the mosdef survey: direct-method metallicities and ism conditions at z ∼ 1.5-3.5 |
we explore the connection between the uv luminosity functions (lfs) of high-z galaxies and the distribution of stellar masses and star formation histories (sfhs) in their host dark matter halos. we provide a baseline for a redshift-independent star formation efficiency model to which observations and models can be comp... | a redshift-independent efficiency model: star formation and stellar masses in dark matter halos at z ≳ 4 |
polarization measurements of thermal radiation from magnetic white dwarf (mwd) stars have been proposed as a probe of axion-photon mixing. the radiation leaving the surface of the mwd is unpolarized, but if low-mass axions exist then photons polarized parallel to the direction of the mwd's magnetic field may convert in... | upper limit on the axion-photon coupling from magnetic white dwarf polarization |
the kepler mission has provided exquisite data to perform an ensemble asteroseismic analysis on evolved stars. in this work we systematically characterize solar-like oscillations and granulation for 16,094 oscillating red giants, using end-of-mission long-cadence data. we produced a homogeneous catalog of the frequency... | asteroseismology of 16,000 kepler red giants: global oscillation parameters, masses, and radii |
the k2 mission uses the kepler spacecraft to obtain high-precision photometry over ≈80 day campaigns in the ecliptic plane. the ecliptic plane input catalog (epic) provides coordinates, photometry, and kinematics based on a federation of all-sky catalogs to support target selection and target management for the k2 miss... | the k2 ecliptic plane input catalog (epic) and stellar classifications of 138,600 targets in campaigns 1-8 |
in this chapter we review recent advances in understanding the roles that magnetic fields play throughout the star formation process, gained through observations and simulations of molecular clouds, the dense, star-forming phase of the magnetized, turbulent interstellar medium (ism). recent results broadly support a pi... | magnetic fields in star formation: from clouds to cores |
we report 18 dust continuum detections (≥3.3σ) at ~88 and 158 $\mu{\rm m}$ out of 49 ultraviolet (uv)-bright galaxies (muv < -21.3 mag) at $z$ > 6.5, observed by the cycle-7 atacama large millimeter/submillimeter array (alma) large program, reionization-era bright emission line survey (rebels) and its pilot progr... | the alma rebels survey: dust continuum detections at z > 6.5 |
increasingly, uncertainties in predictions from galaxy formation simulations (at sub-milky way masses) are dominated by uncertainties in stellar evolution inputs. in this paper, we present the full set of updates from the feedback in realistic environment (fire)-2 version of the fire project code, to the next version, ... | fire-3: updated stellar evolution models, yields, and microphysics and fitting functions for applications in galaxy simulations |
finite size effects in a neutron star merger are manifested, at leading order, through the tidal deformabilities of the stars. if strong first-order phase transitions do not exist within neutron stars, both neutron stars are described by the same equation of state, and their tidal deformabilities are highly correlated ... | tidal deformabilities and neutron star mergers |
spherex is a proposed nasa midex mission selected for phase a study. spherex would carry out the first all-sky spectral survey in the near infrared. at the end of its two-year mission, spherex would obtain 0.75-to-5$\mu$m spectra of every 6.2 arcsec pixel on the sky, with spectral resolution r>35 and a 5-$\sigma$ se... | science impacts of the spherex all-sky optical to near-infrared spectral survey ii: report of a community workshop on the scientific synergies between the spherex survey and other astronomy observatories |
neutrinos are known to play important roles in many astrophysical scenarios from the early period of the big bang to current stellar evolution being a unique messenger of the fusion reactions occurring in the center of our sun. in particular, neutrinos are crucial in determining the dynamics and the composition evoluti... | neutrinos and nucleosynthesis of elements |
we present pipe3d, an analysis pipeline based on the fit3d fitting tool, developed to explore the properties of the stellar populations and ionized gas of integral field spectroscopy (ifs) data. pipe3d was created to provide coherent, simple to distribute, and comparable dataproducts, independently of the origin of the... | pipe3d, a pipeline to analyze integral field spectroscopy data: ii. analysis sequence and califa dataproducts |
we present a large spectroscopic campaign with keck/multi-object spectrometer for infrared exploration (mosfire) targeting lyα emission (lyα) from intrinsically faint lyman-break galaxies (lbgs) behind 12 efficient galaxy cluster lenses. gravitational lensing allows us to probe the more abundant faint galaxy population... | constraining the neutral fraction of hydrogen in the igm at redshift 7.5 |
recent data from the james webb space telescope allow a first glimpse of galaxies at z ≳ 11. the most successful tool for identifying ultra-high-redshift candidates and inferring their properties is photometric template fitting. however, current methods rely on templates derived from much lower-redshift conditions, inc... | templates for fitting photometry of ultra-high-redshift galaxies |
cosmic dust is an essential component shaping both the evolution of galaxies and their observational signatures. how quickly dust builds up in the early universe remains an open question that requires deep observations at (sub-)millimetre wavelengths to resolve. here, we use atacama large millimeter array observations ... | the alma rebels survey: the dust-obscured cosmic star formation rate density at redshift 7 |
the [c ii] 158 μm line is one of the strongest ir emission lines, which has been shown to trace the star formation rate (sfr) of galaxies in the nearby universe, and up to z ∼ 2. whether this is also the case at higher redshift and in the early universe remains debated. the alpine survey, which targeted 118 star-formin... | the alpine-alma [c ii] survey. little to no evolution in the [c ii]-sfr relation over the last 13 gyr |
we show that a black-hole binary with an external companion can undergo lidov-kozai cycles that cause a close pericenter passage, leading to a rapid merger due to gravitational-wave emission. this scenario occurs most often for systems in which the companion has a mass comparable to the reduced mass of the binary and t... | lidov-kozai cycles with gravitational radiation: merging black holes in isolated triple systems |
the recent release of the second gravitational-wave transient catalog (gwtc-2) has increased significantly the number of known gw events, enabling unprecedented constraints on formation models of compact binaries. one pressing question is to understand the fraction of binaries originating from different formation chann... | joint constraints on the field-cluster mixing fraction, common envelope efficiency, and globular cluster radii from a population of binary hole mergers via deep learning |
gw170817 is the very first observation of gravitational waves originating from the coalescence of two compact objects in the mass range of neutron stars, accompanied by electromagnetic counterparts, and offers an opportunity to directly probe the internal structure of neutron stars. we perform bayesian model selection ... | model comparison from ligo-virgo data on gw170817's binary components and consequences for the merger remnant |
we report a quantum monte carlo calculation of the equation of state of symmetric nuclear matter using local interactions derived from chiral effective field theory up to next-to-next-to-leading order fit to few-body observables only. the empirical saturation density and energy are well reproduced within statistical an... | nuclear and neutron-star matter from local chiral interactions |
the δ-isobar degrees of freedom are included in the covariant density functional (cdf) theory to study the equation of state (eos) and composition of dense matter in compact stars. in addition to δ's we include the full octet of baryons, which allows us to study the interplay between the onset of delta isobars and hype... | competition between delta isobars and hyperons and properties of compact stars |
we use high-resolution simulations of isolated dwarf galaxies to study the physics of dark matter cusp-core transformations at the edge of galaxy formation: m200 = 107-109 m⊙. we work at a resolution (∼4 pc minimum cell size; ∼250 m⊙ per particle) at which the impact from individual supernovae explosions can be resolve... | dark matter cores all the way down |
merging neutron stars produce "kilonovae"-electromagnetic transients powered by the decay of unstable nuclei synthesized via rapid neutron capture (the r-process) in material that is gravitationally unbound during inspiral and coalescence. kilonova emission, if accurately interpreted, can be used to characterize the ma... | kilonovae across the nuclear physics landscape: the impact of nuclear physics uncertainties on r-process-powered emission |
axion-like particle (alp) dark matter shows distinctive behavior on scales where wavelike effects dominate over self-gravity. ultralight axions are candidates for fuzzy dark matter (fdm) whose de broglie wavelength in virialized halos reaches scales of kiloparsecs. important features of fdm scenarios are the formation ... | small-scale structure of fuzzy and axion-like dark matter |
we present keck-mosfire h and k spectra for a sample of 24 candidate quiescent galaxies at 3 < z < 4, identified from their rest-frame uvj colors and photometric redshifts in the zfourge and 3dhst surveys. with median integration times of one hour in h and five in k, we obtain spectroscopic redshifts for half of ... | near infrared spectroscopy and star-formation histories of 3 ≤ z ≤ 4 quiescent galaxies |
we present the characterization of the main properties of a sample of 98 agn host galaxies, both type-ii and type-i, in comparison with those of ≈2700 non-active galaxies observed by the manga survey. we found that agn hosts are morphologically early-type or early-spirals. agn hosts are, on average, more massive, more ... | sdss iv manga - properties of agn host galaxies |
accurate and fast gravitational waveform (gw) models are essential to extract information about the properties of compact binary systems that generate gws. building on previous work, we present an extension of the nrtidal model for binary neutron star (bns) waveforms. the upgrades are (i) a new closed-form expression f... | improving the nrtidal model for binary neutron star systems |
the phenomenon of quasi-periodic pulsations (qpps) in solar and stellar flares has been known for over 50 years and significant progress has been made in this research area. it has become clear that qpps are not rare—they are found in many flares and, therefore, robust flare models should reproduce their properties in ... | quasi-periodic pulsations in solar and stellar flares: a review of underpinning physical mechanisms and their predicted observational signatures |
we report our observation of the short gamma-ray burst (grb) grb 170817a, associated to the binary neutron star merger gravitational wave (gw) event gw 170817, performed in the x-ray band with xmm-newton 135 d after the event (on 29 december, 2017). we find evidence for a flattening of the x-ray light curve with respec... | the evolution of the x-ray afterglow emission of gw 170817/ grb 170817a in xmm-newton observations |
observational evidence points to a red supergiant (rsg) progenitor for sn 2023ixf. the progenitor candidate has been detected in archival images at wavelengths (≥0.6 μm) where rsgs typically emit profusely. this object is distinctly variable in the infrared (ir). we characterize the variability using pre-explosion mid-... | the sn 2023ixf progenitor in m101. i. infrared variability |
metamodeling for the nucleonic equation of state (eos), inspired from a taylor expansion around the saturation density of symmetric nuclear matter, is proposed and parameterized in terms of the empirical parameters. the present knowledge of nuclear empirical parameters is first reviewed in order to estimate their avera... | equation of state for dense nucleonic matter from metamodeling. i. foundational aspects |
we present a new moment-based energy-integrated neutrino transport code for neutron star merger simulations in general relativity. in the merger context, ours is the first code to include doppler effects at all orders in υ/c, retaining all non-linear neutrino-matter coupling terms. the code is validated with a stringen... | a new moment-based general-relativistic neutrino-radiation transport code: methods and first applications to neutron star mergers |
the dark energy spectroscopic instrument (desi) survey is a spectroscopic survey of tens of millions of galaxies at 0 < z < 3.5 covering 14,000 sq. deg. of the sky. in its first 1.1 yr of survey operations, it has observed more than 14 million galaxies and 4 million stars. we describe the processes that govern de... | survey operations for the dark energy spectroscopic instrument |
we present epic variability extraction and removal for exoplanet science targets (everest), an open-source pipeline for removing instrumental noise from k2 light curves. everest employs a variant of pixel level decorrelation to remove systematics introduced by the spacecraft’s pointing error and a gaussian process to c... | everest: pixel level decorrelation of k2 light curves |
fast radio bursts (frbs) are millisecond-duration flashes of radio waves that are visible at distances of billions of light years1. the nature of their progenitors and their emission mechanism remain open astrophysical questions2. here we report the detection of the multicomponent frb 20191221a and the identification o... | sub-second periodicity in a fast radio burst |
we present the “sins/zc-sinf ao survey” of 35 star-forming galaxies, the largest sample with deep adaptive optics (ao)-assisted near-infrared integral field spectroscopy at z ∼ 2. the observations, taken with sinfoni at the very large telescope, resolve the hα and [n ii] emission and kinematics on scales of ∼1.5 kpc. t... | the sins/zc-sinf survey of z ∼ 2 galaxy kinematics: sinfoni adaptive optics-assisted data and kiloparsec-scale emission-line properties |
the subaru coronagraphic extreme adaptive optics (scexao) instrument is a multipurpose high-contrast imaging platform designed for the discovery and detailed characterization of exoplanetary systems and serves as a testbed for high-contrast imaging technologies for elts. it is a multi-band instrument which makes use of... | the subaru coronagraphic extreme adaptive optics system: enabling high-contrast imaging on solar-system scales |
we present a detailed analysis of the rest-frame optical emission line ratios for three spectroscopically confirmed galaxies at z > 7.5. the galaxies were identified in the james webb space telescope (jwst) early release observations field smacs j0723.3 - 7327. by quantitatively comparing balmer and oxygen line rati... | first insights into the ism at z > 8 with jwst: possible physical implications of a high [o iii] λ4363/[o iii] λ5007 |
we present new observations of the binary neutron star merger gw170817 at δt ≈ 220-290 days post-merger, at radio (karl g. jansky very large array; vla), x-ray (chandra x-ray observatory), and optical (hubble space telescope; hst) wavelengths. these observations provide the first evidence for a turnover in the x-ray li... | a decline in the x-ray through radio emission from gw170817 continues to support an off-axis structured jet |
a binary neutron star merger has been observed in a multi-messenger detection of gravitational wave (gw) and electromagnetic (em) radiation. binary neutron stars that merge within a hubble time, as well as many other compact binaries, are expected to form via common envelope evolution. yet five decades of research on c... | successful common envelope ejection and binary neutron star formation in 3d hydrodynamics |
we present evidence for localized deviations from keplerian rotation, i.e., velocity "kinks," in 8 of the 18 circumstellar disks observed by the dsharp program: doar 25, elias 2-27, gw lup, hd 143006, hd 163296, im lup, sz 129, and waoph 6. most of the kinks are detected over a small range in both radial extent and vel... | nine localized deviations from keplerian rotation in the dsharp circumstellar disks: kinematic evidence for protoplanets carving the gaps |
common-envelope (ce) evolution in massive binary systems is thought to be one of the most promising channels for the formation of compact binary mergers. in the case of merging binary black holes (bbhs), the essential ce phase takes place at a stage when the first bh is already formed and the companion star expands as ... | it has to be cool: supergiant progenitors of binary black hole mergers from common-envelope evolution |
when and how planets form in protoplanetary disks is still a topic of discussion. exoplanet detection surveys and protoplanetary disk surveys are now providing results that are leading to new insights. we collect the masses of confirmed exoplanets and compare their dependence on stellar mass with the same dependence fo... | why do protoplanetary disks appear not massive enough to form the known exoplanet population? |
we use a particle tracking analysis to study the origins of the circumgalactic medium (cgm), separating it into (1) accretion from the intergalactic medium (igm), (2) wind from the central galaxy, and (3) gas ejected from other galaxies. our sample consists of 21 fire-2 simulations, spanning the halo mass range mh ∼ 10... | the origins of the circumgalactic medium in the fire simulations |
observations of evolution in the dust-to-metal ratio allow us to constrain the dominant dust processing mechanisms. in this work, we present a study of the dust-to-metal and dust-to-gas ratios in a sub-sample of ~500 dustpedia galaxies. using literature and muse emission line fluxes, we derived gas-phase metallicities ... | a systematic metallicity study of dustpedia galaxies reveals evolution in the dust-to-metal ratios |
we have presented a new anisotropic solution of einstein's field equations for compact-star models. einstein's field equations are solved by using the class-one condition (s.n. pandey, s.p. sharma, gen. relativ. gravit. 14, 113 (1982)). we constructed the expression for the anisotropy factor ( δ by using the pressure a... | a new exact anisotropic solution of embedding class one |
in this work, we attempt to find an anisotropic solution for a compact star generated by gravitational decoupling in f(q)-gravity theory having a null complexity factor. to do this, we initially derive the complexity factor condition in f(q) gravity theory using the definition given by herrera (phys rev d 97:044010, 20... | complexity-free solution generated by gravitational decoupling for anisotropic self-gravitating star in symmetric teleparallel f(q)-gravity theory |
we report the detection of a transiting planet around π men (hd 39091), using data from the transiting exoplanet survey satellite (tess). the solar-type host star is unusually bright (v = 5.7) and was already known to host a jovian planet on a highly eccentric, 5.7 yr orbit. the newly discovered planet has a size of 2.... | tess discovery of a transiting super-earth in the pi mensae system |
the neutron star (ns) merger gw170817 was followed over several days by optical-wavelength (“blue”) kilonova (kn) emission likely powered by the radioactive decay of light r-process nuclei synthesized by ejecta with a low neutron abundance (electron fraction ye≈ 0.25-0.35). while the composition and high velocities of ... | a magnetar origin for the kilonova ejecta in gw170817 |
the discovery by advanced ligo/virgo of gravitational waves from the binary neutron star (ns) merger gw170817, and subsequently by astronomers of transient counterparts across the electromagnetic (em) spectrum, has initiated the era of multi-messenger astronomy. given the slew of papers appearing on this event, i thoug... | welcome to the multi-messenger era! lessons from a neutron star merger and the landscape ahead |
neutron star interiors provide the opportunity to probe properties of cold dense matter in the qcd phase diagram. utilizing models of dense matter in accord with nuclear systematics at nuclear densities, we investigate the compatibility of deconfined quark cores with current observational constraints on the maximum mas... | treating quarks within neutron stars |
we study the impact of large-scale perturbations from convective shell burning on the core-collapse supernova explosion mechanism using 3d multigroup neutrino hydrodynamics simulations of an 18m⊙ progenitor. seed asphericities in the o shell, obtained from a recent 3d model of o shell burning, help trigger a neutrino-d... | supernova simulations from a 3d progenitor model - impact of perturbations and evolution of explosion properties |
we present a detailed study of the rest-optical (3600-7000 å) nebular spectra of ∼380 star-forming galaxies at z≃ 2{--}3, obtained with keck/multi-object spectrometer for infrared exploration (mosfire) as part of the keck baryonic structure survey (kbss). the kbss-mosfire sample is representative of star-forming galaxi... | nebular emission line ratios in z ≃ 2-3 star-forming galaxies with kbss-mosfire: exploring the impact of ionization, excitation, and nitrogen-to-oxygen ratio |
the repeating fast radio burst source frb 121102 has been shown to have an exceptionally high and variable faraday rotation measure (rm), which must be imparted within its host galaxy, likely by or within its local environment. in the redshifted (z = 0.193) source reference frame, the rm decreased from 1.46 × 105 rad m... | rotation measure evolution of the repeating fast radio burst source frb 121102 |
we use the new modular open source fitter for transients to model 38 hydrogen-poor superluminous supernovae (slsne). we fit their multicolor light curves with a magnetar spin-down model and present posterior distributions of magnetar and ejecta parameters. the color evolution can be fit with a simple absorbed blackbody... | the magnetar model for type i superluminous supernovae. i. bayesian analysis of the full multicolor light-curve sample with mosfit |
long-duration gamma-ray bursts (grbs) are powerful cosmic explosions, signaling the death of massive stars. among them, grb 221009a is by far the brightest burst ever observed. because of its enormous energy ( e iso ≈ 10 55 erg) and proximity ( z ≈ 0.15), grb 221009a is an exceptionally rare event that pushes the limit... | a structured jet explains the extreme grb 221009a |
we present an early analysis on the search for high-redshift galaxies using the deepest public jwst imaging to date, the ngdeep field. these data consist of six-band nircam imaging on the hubble ultra deep field parallel 2 (hudf-par2), covering a total area of 6.3 arcmin2. based on our initial reduction of the first ha... | a large population of faint 8 < z < 16 galaxies found in the first jwst nircam observations of the ngdeep survey |
we present n-body simulations of a sagittarius (sgr)-like dwarf spheroidal galaxy that follows its orbit about the milky way (mw) since its first crossing of the galaxy's virial radius to the present day. as sgr orbits around the mw, it excites vertical oscillations, corrugating and flaring the galactic stellar disc. t... | the influence of sagittarius and the large magellanic cloud on the stellar disc of the milky way galaxy |
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/nuclear physics to the correlated electron systems. however, many systems of great importance (dense matter inside neutron stars, the repulsive hubba... | complex paths around the sign problem |
we carried out a bayesian homogeneous determination of the orbital parameters of 231 transiting giant planets (tgps) that are alone or have distant companions; we employed differential evolution markov chain monte carlo methods to analyse radial-velocity (rv) data from the literature and 782 new high-accuracy rvs obtai... | the gaps programme with harps-n at tng . xiv. investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets |
we report the detection of extended lyα emission around individual star-forming galaxies at redshifts z = 3-6 in an ultradeep exposure of the hubble deep field south obtained with muse on the eso-vlt. the data reach a limiting surface brightness (1σ) of ~1 × 10-19 erg s-1 cm-2 arcsec-2 in azimuthally averaged radial pr... | extended lyman α haloes around individual high-redshift galaxies revealed by muse |
this work aims to investigate the behaviour of compact stars in the background of theory of gravity. for current work, we consider the krori-barua metric potential i.e., and , where, and c are constants. we use matching conditions of spherically symmetric space-time with schwarzschild solution as an exterior geometry a... | relativistic krori-barua compact stars in f(r,t)f(r,t) gravity |
we review the physics of hyperons and δ-resonances in dense matter in compact stars. the covariant density functional approach to the equation of state and composition of dense nuclear matter in the mean-field hartree and hartree-fock approximation is presented, with regimes covering cold β-equilibrated matter, hot and... | heavy baryons in compact stars |
advanced ligo and advanced virgo are detecting a large number of binary stellar origin black hole (bh) mergers. a promising channel for accelerated bh merger lies in active galactic nucleus (agn) discs of gas around supermasssive bhs. here, we investigate the relative number of compact object (co) mergers in agn disc m... | black hole, neutron star, and white dwarf merger rates in agn discs |
gravitational-wave detections have revealed a previously unknown population of stellar mass black holes with masses above 20 m ⊙. these observations provide a new way to test models of stellar evolution for massive stars. by considering the astrophysical processes likely to determine the shape of the binary black hole ... | measuring the binary black hole mass spectrum with an astrophysically motivated parameterization |
the kepler mission has discovered thousands of planets with radii <4 {r}\oplus , paving the way for the first statistical studies of the dynamics, formation, and evolution of these sub-neptunes and super-earths. planetary masses are an important physical property for these studies, and yet the vast majority of keple... | probabilistic mass-radius relationship for sub-neptune-sized planets |
the mass spectrum of stellar mass black holes (bhs) is highly uncertain. dynamical mass measurements are available only for few (∼10) bhs in x-ray binaries, while theoretical models strongly depend on the hydrodynamics of supernova (sn) explosions and on the evolution of massive stars. in this paper, we present and dis... | the mass spectrum of compact remnants from the parsec stellar evolution tracks |
we present a novel relativistic density-functional approach to modeling quark matter with a mechanism to mimic confinement. the quasiparticle treatment of quarks provides their suppression due to a large quark self energy already at the mean-field level. we demonstrate that our approach is equivalent to a chiral quark ... | density functional approach to quark matter with confinement and color superconductivity |
based on various diagnostics and corrections established in the framework of several sunspot number workshops and described by clette et al. (space sci. rev.186, 35, 2014), we now assembled all separately derived corrections to produce a new standard version of the reference sunspot-number time series. we explain here ... | the new sunspot number: assembling all corrections |
the organic-inorganic hybrid lead halide perovskites have emerged as a series of star materials for solar cells, lasers and detectors. however, the issues raised by the toxic lead element and marginal stability due to the volatile organic components have severely limited their potential applications. in this work, we d... | nucleation-controlled growth of superior lead-free perovskite cs3bi2i9 single-crystals for high-performance x-ray detection |
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