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this paper presents a table with estimates of the absolute magnitude of the sun and the conversions from vegamag to the ab and st systems for several wide-band filters used in ground-based and space-based observatories. these estimates use the dustless spectral energy distribution (sed) of vega, calibrated absolutely u... | the absolute magnitude of the sun in several filters |
two neutron stars merging together generate a gravitational wave signal and have also been predicted to emit electromagnetic radiation. when the gravitational wave event gw170817 was detected, astronomers rushed to search for the source using conventional telescopes (see the introduction by smith). coulter et al. descr... | early spectra of the gravitational wave source gw170817: evolution of a neutron star merger |
finite-density lattice qcd aims for the first-principle study of qcd at finite density, which describes the system consisting of many quarks. the main targets are systems such as quark-gluon plasma, nuclei, and neutron stars. explaining macroscopic physics from the microscopic theory is a natural path in the developmen... | finite-density lattice qcd and sign problem: current status and open problems |
in this review, i will discuss the comparison between model results and observational data for the milky way, the predictive power of such models as well as their limits. such a comparison, known as galactic archaeology, allows us to impose constraints on stellar nucleosynthesis and timescales of formation of the vario... | modelling the chemical evolution of the milky way |
we report a robust sample of 10 massive quiescent galaxies at redshift, z > 3, selected using the first data from the jwst cosmic evolution early release science programme. three of these galaxies are at 4 < z < 5, constituting the best evidence to date for quiescent galaxies significantly before z = 4. these ... | a surprising abundance of massive quiescent galaxies at 3 < z < 5 in the first data from jwst ceers |
context. the inner regions of the envelopes surrounding young protostars are characterized by a complex chemistry, with prebiotic molecules present on the scales where protoplanetary disks eventually may form. the atacama large millimeter/submillimeter array (alma) provides an unprecedented view of these regions zoomin... | the alma protostellar interferometric line survey (pils). first results from an unbiased submillimeter wavelength line survey of the class 0 protostellar binary iras 16293-2422 with alma |
it is predicted that the spectrum of radio emission from the whole sky should show a dip arising from the action of the light from the first stars on the hydrogen atoms in the surrounding gas, which causes the 21-cm line to appear in absorption against the cosmic microwave background. bowman et al. 2018 identified a br... | concerns about modelling of the edges data |
we present a comparison between several simulation codes designed to study the core-collapse supernova mechanism. we pay close attention to controlling the initial conditions and input physics in order to ensure a meaningful and informative comparison. our goal is three-fold. first, we aim to demonstrate the current le... | global comparison of core-collapse supernova simulations in spherical symmetry |
time-delay cosmography of lensed quasars has achieved 2.4% precision on the measurement of the hubble constant, h0. as part of an ongoing effort to uncover and control systematic uncertainties, we investigate three potential sources: 1- stellar kinematics, 2- line-of-sight effects, and 3- the deflector mass model. to m... | tdcosmo. i. an exploration of systematic uncertainties in the inference of h0 from time-delay cosmography |
context. the post-asymptotic giant branch (agb) phase is arguably one of the least understood phases of the evolution of low- and intermediate- mass stars. the two grids of models presently available are based on outdated micro- and macrophysics and do not agree with each other. studies of the central stars of planetar... | new models for the evolution of post-asymptotic giant branch stars and central stars of planetary nebulae |
we review the current status and recent progress of microscopic many-body approaches and phenomenological models, which are employed to construct the equation of state of neutron stars. the equation of state is relevant for the description of their structure and dynamical properties, and it rules also the dynamics of c... | neutron stars and the nuclear equation of state |
magnetars are the strongest magnets in the present universe and the combination of extreme magnetic field, gravity and density makes them unique laboratories to probe current physical theories (from quantum electrodynamics to general relativity) in the strong field limit. magnetars are observed as peculiar, burst-activ... | magnetars: the physics behind observations. a review |
we present multiple ultrahigh resolution cosmological hydrodynamic simulations of m⋆ ≃ 104-6.3 m⊙ dwarf galaxies that form within two mvir = 109.5-10 m⊙ dark matter halo initial conditions. our simulations rely on the feedback in realistic environments (fire) implementation of star formation feedback and were run with ... | forged in fire: cusps, cores and baryons in low-mass dwarf galaxies |
alma observations of the long wavelength dust continuum are used to estimate the interstellar medium (ism) masses in a sample of 708 galaxies at z = 0.3 to 4.5 in the cosmos field. the galaxy sample has known far-infrared luminosities and, hence, star formation rates (sfrs) and stellar masses ({m}* ) from the optical-i... | evolution of interstellar medium, star formation, and accretion at high redshift |
we employ polarization-resolved electronic raman spectroscopy and density functional theory to study the primary and secondary order parameters, as well as their interplay, in the charge density wave (cdw) state of the kagome metal a v3sb5 . previous x-ray diffraction data at 15 k established that the cdw order in csv3... | charge density wave order in the kagome metal a v3sb5 (a =cs ,rb ,k ) |
we derive the probability for a newly formed binary black hole (bbh) to undergo an eccentric gravitational wave (gw) merger during binary-single interactions inside a stellar cluster. by integrating over the hardening interactions such a bbh must undergo before ejection, we find that the observable rate of bbh mergers ... | eccentric black hole mergers forming in globular clusters |
we present new stellar mass functions at z ~ 6, z ~ 7, z ~ 8, z ~ 9 and, for the first time, z ~ 10, constructed from ~800 lyman-break galaxies previously identified over the extreme deep field and hubble ultra-deep field parallel fields and the five cosmic assembly near-infrared deep extragalactic legacy survey fields... | galaxy stellar mass functions from z 10 to z 6 using the deepest spitzer/infrared array camera data: no significant evolution in the stellar-to-halo mass ratio of galaxies in the first gigayear of cosmic time |
we investigate the evolution of galaxy masses and star formation rates in the evolution and assembly of galaxies and their environment (eagle) simulations. these comprise a suite of hydrodynamical simulations in a λ cold dark matter cosmogony with subgrid models for radiative cooling, star formation, stellar mass-loss ... | evolution of galaxy stellar masses and star formation rates in the eagle simulations |
context. the gaia second data release (dr2) presents a first mapping of full-sky rr lyrae stars and cepheids observed by the spacecraft during the initial 22 months of science operations.aims: the specific objects study (sos) pipeline, developed to validate and fully characterise cepheids and rr lyrae stars (sos cep&am... | gaia data release 2. specific characterisation and validation of all-sky cepheids and rr lyrae stars |
the variable stars in the vsx catalogue are derived from a multitude of inhomogeneous data sources and classification tools. this inhomogeneity complicates our understanding of variable star types, statistics, and properties, and it directly affects attempts to build training sets for current (and next) generation all-... | the asas-sn catalogue of variable stars - ii. uniform classification of 412 000 known variables |
nuclear star clusters around a central massive black hole (mbh) are expected to be abundant in stellar black hole (bh) remnants and bh-bh binaries. these binaries form a hierarchical triple system with the central mbh, and gravitational perturbations from the mbh can cause high-eccentricity excitation in the bh-bh bina... | black hole mergers in galactic nuclei induced by the eccentric kozai-lidov effect |
the aless survey has followed up on a sample of 122 sub-millimeter sources in the extended chandra deep field south at 870 μm with the atacama large millimeter array (alma), allowing us to pinpoint the positions of sub-millimeter galaxies (smgs) to ∼0.3 arcsec and to find their precise counterparts at different wavelen... | an alma survey of sub-millimeter galaxies in the extended chandra deep field south: physical properties derived from ultraviolet-to-radio modeling |
we present a catalog of stellar properties for a large sample of 6676 evolved stars with apache point observatory galactic evolution experiment spectroscopic parameters and kepler asteroseismic data analyzed using five independent techniques. our data include evolutionary state, surface gravity, mean density, mass, rad... | the second apokasc catalog: the empirical approach |
we explore the predictions for detectable gravitational-wave signals from merging binary black holes formed through chemically homogeneous evolution in massive short-period stellar binaries. we find that ∼500 events per year could be detected with advanced ground-based detectors operating at full sensitivity. we analys... | the chemically homogeneous evolutionary channel for binary black hole mergers: rates and properties of gravitational-wave events detectable by advanced ligo |
high-contrast adaptive optics (ao) imaging is a powerful technique to probe the architectures of planetary systems from the outside-in and survey the atmospheres of self-luminous giant planets. direct imaging has rapidly matured over the past decade and especially the last few years with the advent of high-order ao sys... | imaging extrasolar giant planets |
the trappist-1 system is the first transiting planet system found orbiting an ultracool dwarf star 1 . at least seven planets similar in radius to earth were previously found to transit this host star 2 . subsequently, trappist-1 was observed as part of the k2 mission and, with these new data, we report the measurement... | a seven-planet resonant chain in trappist-1 |
the neutron star interior composition explorer collaboration recently published a joint estimate of the mass and the radius of psr j0030+0451, derived via x-ray pulse-profile modeling. raaijmakers et al. explored the implications of this measurement for the dense matter equation of state (eos) using two parameterizatio... | constraining the dense matter equation of state with joint analysis of nicer and ligo/virgo measurements |
magnetars younger than one century are expected to be hyperactive: besides winds powered by rotation, they can generate frequent magnetic flares, which launch powerful blast waves into the wind. the resulting magnetized shocks act as masers producing bright radio emission. this theoretical picture predicts radio bursts... | blast waves from magnetar flares and fast radio bursts |
in this paper we present the mosfire deep evolution field (mosdef) survey. the mosdef survey aims to obtain moderate-resolution (r = 3000-3650) rest-frame optical spectra (∼3700-7000 å) for ∼1500 galaxies at 1.37≤ z≤ 3.80 in three well-studied candels fields: aegis, cosmos, and goods-n. targets are selected in three re... | the mosfire deep evolution field (mosdef) survey: rest-frame optical spectroscopy for ~1500 h-selected galaxies at 1.37 < z < 3.8 |
we explore the consequences of imposing robust thermodynamic constraints arising from perturbative quantum chromodynamics (qcd) when inferring the dense-matter equation-of-state (eos). we find that the termination density, up to which the eos modeling is performed in an inference setup, strongly affects the constrainin... | equation of state at neutron-star densities and beyond from perturbative qcd |
axions can be copiously produced in localized regions of neutron star magnetospheres where the ambient plasma is unable to efficiently screen the induced electric field. as these axions stream away from the neutron star they can resonantly transition into photons, generating a large broadband contribution to the neutro... | novel constraints on axions produced in pulsar polar-cap cascades |
we present the first comprehensive halo occupation distribution (hod) analysis of the desi one-percent survey luminous red galaxy (lrg) and quasi-stellar object (qso) samples. we constrain the hod of each sample and test possible hod extensions by fitting the redshift-space galaxy 2-point correlation functions in 0.15 ... | the desi one-percent survey: exploring the halo occupation distribution of luminous red galaxies and quasi-stellar objects with abacussummit |
the apache point observatory galactic evolution experiment (apogee), part of the sloan digital sky survey iii, explores the stellar populations of the milky way using the sloan 2.5-m telescope linked to a high resolution (r ∼ 22,500), near-infrared (1.51-1.70 μm) spectrograph with 300 optical fibers. for over 150,000 p... | the data reduction pipeline for the apache point observatory galactic evolution experiment |
the manga survey (mapping nearby galaxies at apache point observatory) is one of three core programs in the sloan digital sky survey iv. it is obtaining integral field spectroscopy for 10,000 nearby galaxies at a spectral resolution of r ∼ 2000 from 3622 to 10354 å. the design of the survey is driven by a set of scienc... | sdss-iv manga ifs galaxy survey—survey design, execution, and initial data quality |
white dwarfs are a class of stars with unique physical properties. they present many challenging problems whose solution requires advanced theories of dense matter, state-of-the-art experimental techniques, and extensive computing efforts. new ground- and space-based observatories will soon provide an increasingly deta... | current challenges in the physics of white dwarf stars |
context. the gaia early data release 3 contained the positions, parallaxes, and proper motions of 1.5 billion sources, some of which did not show a good fit to the `single star' model. binarity is one of the causes of this.aims: four million of these stars were selected and various models were tested to detect binary s... | gaia data release 3. astrometric binary star processing |
the presence of a stellar bar in a disc galaxy indicates that the galaxy hosts a dynamically settled disc and that bar-driven processes are taking place in shaping the evolution of the galaxy. studying the cosmic evolution of the bar fraction in disc galaxies is therefore essential to understand galaxy evolution in gen... | a jwst investigation into the bar fraction at redshifts 1 < z < 3 |
we select galaxies from the illustristng hydrodynamical simulations (m_stars> 10^9 m_⊙ at 0 ≤ z ≤ 2) and characterize the shapes and evolutions of their uvj and star formation rate-stellar mass (sfr-mstars) diagrams. we quantify the systematic uncertainties related to different criteria to classify star-forming vers... | the star formation activity of illustristng galaxies: main sequence, uvj diagram, quenched fractions, and systematics |
here we present high-resolution (15-24 au) observations of co isotopologue lines from the molecules with alma on planet-forming scales (maps) alma large program. our analysis employs observations of the (j = 2-1) and (1-0) lines of 13co and c18o and the (j = 1-0) line of c17o for five protoplanetary disks. we retrieve ... | molecules with alma at planet-forming scales (maps). v. co gas distributions |
gas stripping phenomena in galaxies with muse (gasp) is a new integral-field spectroscopic survey with muse at the vlt aimed at studying gas removal processes in galaxies. we present an overview of the survey and show a first example of a galaxy undergoing strong gas stripping. gasp is obtaining deep muse data for 114 ... | gasp. i. gas stripping phenomena in galaxies with muse |
the disk substructures at high angular resolution project (dsharp) is the largest homogeneous high-resolution (∼0.″035, or ∼5 au) disk continuum imaging survey with the atacama large millimeter/submillimeter array (alma) so far. in the coming years, many more disks will be mapped with alma at similar resolution. interp... | the disk substructures at high angular resolution project (dsharp). v. interpreting alma maps of protoplanetary disks in terms of a dust model |
with the first observation of a binary neutron star merger through gravitational waves and light, gw170817, compact binary mergers have now taken the center stage in nuclear astrophysics. they are thought to be one of the main astrophysical sites of production of r-process elements, and merger observations have become ... | the dynamics of binary neutron star mergers and gw170817 |
measuring the metallicity and carbon-to-oxygen (c/o) ratio in exoplanet atmospheres is a fundamental step towards constraining the dominant chemical processes at work and, if in equilibrium, revealing planet formation histories. transmission spectroscopy (for example, refs. 1,2) provides the necessary means by constrai... | early release science of the exoplanet wasp-39b with jwst nircam |
we analyze the rest-frame near-uv and optical nebular spectra of three z > 7 galaxies from the early release observations taken with the near-infrared spectrograph (nirspec) on the james webb space telescope (jwst). these three high-z galaxies show the detection of several strong emission nebular lines, including th... | a first look at the abundance pattern-o/h, c/o, and ne/o-in z > 7 galaxies with jwst/nirspec |
the dark energy spectroscopic instrument (desi) survey will measure large-scale structures using quasars as direct tracers of dark matter in the redshift range 0.9 < z < 2.1 and using lyα forests in quasar spectra at z > 2.1. we present several methods to select candidate quasars for desi, using input photomet... | target selection and validation of desi quasars |
we present the analysis of five black hole candidates identified from gravitational microlensing surveys. hubble space telescope astrometric data and densely sampled light curves from ground-based microlensing surveys are fit with a single-source, single-lens microlensing model in order to measure the mass and luminosi... | an isolated mass-gap black hole or neutron star detected with astrometric microlensing |
we assess a model of late cosmic reionization in which the ionizing background radiation arises entirely from high-redshift quasars and other active galactic nuclei (agns). the low optical depth to thomson scattering reported by the planck collaboration pushes the redshift of instantaneous reionization down to z={8.8}-... | cosmic reionization after planck: could quasars do it all? |
using the spinning worldline quantum field theory formalism we calculate the quadratic-in-spin momentum impulse δ piμ and spin kick δ aiμ from a scattering of two arbitrarily oriented spinning massive bodies (black holes or neutron stars) in a weak gravitational background up to third post-minkowskian (pm) order (g3). ... | conservative and radiative dynamics of spinning bodies at third post-minkowskian order using worldline quantum field theory |
we describe a stream-based analysis pipeline to detect gravitational waves from the merger of binary neutron stars, binary black holes, and neutron-star-black-hole binaries within ∼1 min of the arrival of the merger signal at earth. such low-latency detection is crucial for the prompt response by electromagnetic facili... | analysis framework for the prompt discovery of compact binary mergers in gravitational-wave data |
the heating of the solar chromosphere and corona to the observed high temperatures, imply the presence of ongoing heating that balances the strong radiative and thermal conduction losses expected in the solar atmosphere. it has been theorized for decades that the required heating mechanisms of the chromospheric and cor... | coronal heating by mhd waves |
context. absorption by molecules in the earth's atmosphere strongly affects ground-based astronomical observations. the resulting absorption line strength and shape depend on the highly variable physical state of the atmosphere, i.e. pressure, temperature, and mixing ratio of the different molecules involved. usually, ... | molecfit: a general tool for telluric absorption correction. ii. quantitative evaluation on eso-vlt/x-shooterspectra |
x-ray pulsars (xrps) are accreting strongly magnetised neutron stars (nss) in binary systems with, as a rule, massive optical companions. very reach phenomenology and high observed flux put them into the focus of observational and theoretical studies since the first x-ray instruments were launched into space. the main ... | accreting strongly magnetised neutron stars: x-ray pulsars |
a new table of the nuclear equation of state (eos) based on realistic nuclear potentials is constructed for core-collapse supernova numerical simulations. adopting the eos of uniform nuclear matter constructed by two of the present authors with the cluster variational method starting from the argonne v18 and urbana ix ... | nuclear equation of state for core-collapse supernova simulations with realistic nuclear forces |
we present a sample of nearby dwarf galaxies with radio-selected accreting massive black holes (bhs), the majority of which are non-nuclear. we observed 111 galaxies using sensitive, high-resolution observations from the karl g. jansky very large array (vla) in its most extended a-configuration at x band (∼8-12 ghz), y... | a new sample of (wandering) massive black holes in dwarf galaxies from high-resolution radio observations |
we perform a search for stellar streams around the milky way using the first 3 yr of multiband optical imaging data from the dark energy survey (des). we use des data covering ∼5000 deg2 to a depth of g > 23.5 with a relative photometric calibration uncertainty of <1%. this data set yields unprecedented sensitivi... | stellar streams discovered in the dark energy survey |
type ia supernovae (sne ia) play a key role in the fields of astrophysics and cosmology. it is widely accepted that sne ia arise from thermonuclear explosions of white dwarfs (wds) in binary systems. however, there is no consensus on the fundamental aspects of the nature of sn ia progenitors and their actual explosion ... | type ia supernova explosions in binary systems: a review |
probing the connection between a star’s metallicity and the presence and properties of any associated planets offers an observational link between conditions during the epoch of planet formation and mature planetary systems. we explore this connection by analyzing the metallicities of kepler target stars and the subset... | the california-kepler survey. iv. metal-rich stars host a greater diversity of planets |
jwst observations have revealed a population of galaxies bright enough that potentially challenge standard galaxy formation models in the λ cold dark matter (λcdm) cosmology. using a minimal empirical framework, we investigate the influence of variability on the rest-frame ultra-violet (uv) luminosity function of galax... | the impact of uv variability on the abundance of bright galaxies at z ≥ 9 |
disks of gas and dust surrounding young stars are the birthplace of planets. however, the direct detection of protoplanets forming within disks has proved elusive to date. we present the detection of a large, localized deviation from keplerian velocity in the protoplanetary disk surrounding the young star hd 163296. th... | kinematic evidence for an embedded protoplanet in a circumstellar disk |
thus far, judging the fate of a massive star (either a neutron star [ns] or a black hole) solely by its structure prior to core collapse has been ambiguous. our work and previous attempts find a nonmonotonic variation of successful and failed supernovae with zero-age main-sequence mass, for which no single structural p... | a two-parameter criterion for classifying the explodability of massive stars by the neutrino-driven mechanism |
the number of known periodic variables has grown rapidly in recent years. thanks to its large field of view and faint limiting magnitude, the zwicky transient facility (ztf) offers a unique opportunity to detect variable stars in the northern sky. here, we exploit ztf data release 2 (dr2) to search for and classify var... | the zwicky transient facility catalog of periodic variable stars |
in the first billion years after the big bang, sources of ultraviolet (uv) photons are believed to have ionized intergalactic hydrogen, rendering the universe transparent to uv radiation. galaxies brighter than the characteristic luminosity l* (refs. 1,2) do not provide enough ionizing photons to drive this cosmic reio... | the nature of an ultra-faint galaxy in the cosmic dark ages seen with jwst |
we quantify the distribution of [o iii]+h β line strengths at z ≃ 7 using a sample of 20 bright ( $\mathrm{m}_{\mathrm{uv}}^{}$ ≲ -21) galaxies. we select these systems over wide-area fields (2.3 deg2 total) using a new colour-selection that precisely selects galaxies at z ≃ 6.63-6.83, a redshift range where blue spitz... | the [o iii]+h β equivalent width distribution at z ≃ 7: implications for the contribution of galaxies to reionization |
the binary neutron star merger gw170817 was the first multi-messenger event observed in both gravitational and electromagnetic waves1,2. the electromagnetic signal began approximately two seconds post-merger with a weak, short burst of gamma rays3, which was followed over the next hours and days by the ultraviolet, opt... | the optical afterglow of the short gamma-ray burst associated with gw170817 |
we review the physics potential of a next generation search for solar axions: the international axion observatory (iaxo) . endowed with a sensitivity to discover axion-like particles (alps) with a coupling to photons as small as gaγ~ 10-12 gev-1, or to electrons gae~10-13, iaxo has the potential to find the qcd axion i... | physics potential of the international axion observatory (iaxo) |
during its two-year prime mission, the transiting exoplanet survey satellite (tess) will perform a time-series photometric survey covering over 80% of the sky. this survey comprises observations of 26 24° × 96° sectors that are each monitored continuously for approximately 27 days. the main goal of tess is to find tran... | eleanor: an open-source tool for extracting light curves from the tess full-frame images |
fast radio bursts are bright, unresolved, non-repeating, broadband, millisecond flashes, found primarily at high galactic latitudes, with dispersion measures much larger than expected for a galactic source. the inferred all-sky burst rate is comparable to the core-collapse supernova rate out to redshift 0.5. if the obs... | dense magnetized plasma associated with a fast radio burst |
the physics of star formation and the deposition of mass, momentum and energy into the interstellar medium by massive stars (`feedback') are the main uncertainties in modern cosmological simulations of galaxy formation and evolution1,2. these processes determine the properties of galaxies3,4 but are poorly understood o... | fast and inefficient star formation due to short-lived molecular clouds and rapid feedback |
context. the spectroscopy made easy (sme) package has become a popular tool for analyzing stellar spectra, often in connection with large surveys or exoplanet research. sme has evolved significantly since it was first described in 1996, but many of the original caveats and potholes still haunt users. the main drivers f... | spectroscopy made easy: evolution |
phangs-hst is an ultraviolet-optical imaging survey of 38 spiral galaxies within ~20 mpc. combined with the phangs-alma, phangs-muse surveys and other multiwavelength data, the data set will provide an unprecedented look into the connections between young stars, h ii regions, and cold molecular gas in these nearby star... | distances to phangs galaxies: new tip of the red giant branch measurements and adopted distances |
the density dependence of nuclear symmetry energy is among the most uncertain parts of the equation of state (eos) of dense neutron-rich nuclear matter. it is currently poorly known especially at suprasaturation densities partially because of our poor knowledge about isovector nuclear interactions at short distances. b... | progress in constraining nuclear symmetry energy using neutron star observables since gw170817 |
we give an overview and describe the rationale, methods, and first results from nircam images of the jwst "prime extragalactic areas for reionization and lensing science" (pearls) project. pearls uses up to eight nircam filters to survey several prime extragalactic survey areas: two fields at the north ecliptic pole (n... | jwst pearls. prime extragalactic areas for reionization and lensing science: project overview and first results |
aims: during the last ~50 years, the population of black hole candidates in x-ray binaries has increased considerably, with 59 galactic objects being detected in transient low-mass x-ray binaries, as well as a few in persistent systems (including ~5 extragalactic binaries).methods: we collect near-infrared, optical, an... | blackcat: a catalogue of stellar-mass black holes in x-ray transients |
aims: we present the detailed characterisation of a sample of 56 sources serendipitously detected in alma band 7 as part of the alma large program to investigate cii at early times (alpine). these sources, detected in cosmos and ecdfs, have been used to derive the total infrared luminosity function (lf) and to estimate... | the alpine-alma [cii] survey. the nature, luminosity function, and star formation history of dusty galaxies up to z ≃ 6 |
one of the most striking observations made by parker solar probe during its first solar encounter is the omnipresence of rapid polarity reversals in a magnetic field that is otherwise mostly radial. these so-called switchbacks strongly affect the dynamics of the magnetic field. we concentrate here on their macroscopic ... | switchbacks in the near-sun magnetic field: long memory and impact on the turbulence cascade |
aims: we perform a comprehensive determination of the systemic proper motions of 74 dwarf galaxies and dwarf galaxy candidates in the local group based on gaia early data release 3. the outputs of the analysis for each galaxy, including probabilities of membership, will be made publicly available. the analysis is augme... | gaia early dr3 systemic motions of local group dwarf galaxies and orbital properties with a massive large magellanic cloud |
the identification of the main contributors to the locally observed fluxes of cosmic rays is a prime objective in the resolution of the long-standing enigma of the source of cosmic rays. we report on a compelling similarity of the energy and radial distributions of multi-tev cosmic rays extracted from observations of v... | massive stars as major factories of galactic cosmic rays |
new millisecond pulsars (msps) in compact binaries provide a good opportunity to search for the most massive neutron stars. their main-sequence companion stars are often strongly irradiated by the pulsar, displacing the effective center of light from their barycenter and making mass measurements uncertain. we present a... | peering into the dark side: magnesium lines establish a massive neutron star in psr j2215+5135 |
we present an updated model of the cosmic ionizing background from the uv to the x-rays. relative to our previous model, the new model provides a better match to a large number of up-to-date empirical constraints, including: (1) new galaxy and agn luminosity functions; (2) stellar spectra including binary stars; (3) ob... | a cosmic uv/x-ray background model update |
in quantum fluids, the quantization of circulation forbids the diffusion of a vortex swirling flow seen in classical viscous fluids. yet, accelerating quantum vortices may lose their energy into acoustic radiations1,2, similar to the way electric charges decelerate on emitting photons. the dissipation of vortex energy ... | sound emission and annihilations in a programmable quantum vortex collider |
in the violent post-merger of binary neutron-star mergers strong oscillations are present that impact the emitted gravitational-wave (gw) signal. the frequencies, temperatures and densities involved in these oscillations allow for violations of the chemical equilibrium promoted by weak-interactions, thus leading to a n... | impact of bulk viscosity on the post-merger gravitational-wave signal from merging neutron stars |
accurately understanding the equation of state (eos) of high-density, zero-temperature quark matter plays an essential role in constraining the behavior of dense strongly interacting matter inside the cores of neutron stars. in this letter, we study the weak-coupling expansion of the eos of cold quark matter and derive... | equation of state of cold quark matter to o (αs3ln αs) |
we perform a general-relativistic neutrino-radiation magnetohydrodynamic simulation of a one second-long binary neutron star merger on the japanese supercomputer fugaku using about 85 million cpu hours with 20 736 cpus. we consider an asymmetric binary neutron star merger with masses of 1.2 m⊙ and 1.5 m⊙ and a "soft" e... | self-consistent picture of the mass ejection from a one second long binary neutron star merger leaving a short-lived remnant in a general-relativistic neutrino-radiation magnetohydrodynamic simulation |
it is a major open question which physical processes stop gas accretion on to giant molecular clouds (gmcs) and limit the efficiency at which gas is converted into stars. while feedback from supernova explosions has been the popular feedback mechanism included in simulations of galaxy formation and evolution, 'early' f... | pre-supernova feedback mechanisms drive the destruction of molecular clouds in nearby star-forming disc galaxies |
we report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with phase i of the hydrogen epoch of reionization array (hera). using similar analysis techniques as in previously reported limits, we find at 95% confidence that δ2(k = 0.34 h mpc-1) ≤ 457 ... | improved constraints on the 21 cm eor power spectrum and the x-ray heating of the igm with hera phase i observations |
we report on radio and x-ray observations of the only known repeating fast radio burst (frb) source, frb 121102. we have detected six additional radio bursts from this source: five with the green bank telescope at 2 ghz, and one at 1.4 ghz with the arecibo observatory, for a total of 17 bursts from this source. all hav... | the repeating fast radio burst frb 121102: multi-wavelength observations and additional bursts |
a black hole x-ray binary (xrb) system forms when gas is stripped from a normal star and accretes onto a black hole, which heats the gas sufficiently to emit x-rays. we report a polarimetric observation of the xrb cygnus x-1 using the imaging x-ray polarimetry explorer. the electric field position angle aligns with the... | polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary cygnus x-1 |
the large synoptic survey telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our solar system, galaxy and universe, across half the sky and over ten years of repeated observation. however, exactly how the lsst observations will be taken (the observing strategy ... | science-driven optimization of the lsst observing strategy |
we present high-resolution rotation curves and mass models of 26 dwarf galaxies from “local irregulars that trace luminosity extremes, the h i nearby galaxy survey” (little things). little things is a high-resolution (∼6″ angular; <2.6 km s-1 velocity resolution) very large array h i survey for nearby dwarf galaxies... | high-resolution mass models of dwarf galaxies from little things |
fast radio bursts (frbs) are extragalactic radio flashes of unknown physical origin. their high luminosities and short durations require extreme energy densities, such as those found in the vicinity of neutron stars and black holes. studying the burst intensities and polarimetric properties on a wide range of timescale... | burst timescales and luminosities as links between young pulsars and fast radio bursts |
the ligo/virgo collaboration has recently observed gw190521, the first binary black hole merger with at least the primary component mass in the mass gap predicted by the pair-instability supernova theory. this observation disfavors the standard stellar-origin formation scenario for the heavier black hole, motivating al... | gw190521 mass gap event and the primordial black hole scenario |
for decades we have known that the sun lies within the local bubble, a cavity of low-density, high-temperature plasma surrounded by a shell of cold, neutral gas and dust1-3. however, the precise shape and extent of this shell4,5, the impetus and timescale for its formation6,7, and its relationship to nearby star format... | star formation near the sun is driven by expansion of the local bubble |
the laser interferometer gravitational wave observatory (ligo) consists of two widely separated 4 km laser interferometers designed to detect gravitational waves from distant astrophysical sources in the frequency range from 10 hz to 10 khz. the first observation run of the advanced ligo detectors started in september ... | sensitivity of the advanced ligo detectors at the beginning of gravitational wave astronomy |
the description of nuclei starting from the constituent nucleons and the realistic interactions among them has been a long-standing goal in nuclear physics. in addition to the complex nature of the nuclear forces, with two-, three- and possibly higher many-nucleon components, one faces the quantum-mechanical many-nucle... | unified ab initio approaches to nuclear structure and reactions |
we present the stellar population content of early-type galaxies from the atlas3d survey. using spectra integrated within apertures covering up to one effective radius, we apply two methods: one based on measuring line-strength indices and applying single stellar population (ssp) models to derive ssp-equivalent values ... | the atlas3d project - xxx. star formation histories and stellar population scaling relations of early-type galaxies |
the persistent radio counterpart of fast radio burst (frb) 121102 is estimated to have n∼ {10}52 particles, energy {e}n∼ {10}48 erg, and size r∼ {10}17 cm. the source can be nebula inflated and heated by an intermittent outflow from a magnetar—a neutron star powered by its magnetic (rather than rotational) energy. the ... | a flaring magnetar in frb 121102? |
we use globular cluster data from the resolved stellar populations early release science (ers) program to validate the flux calibration for the near infrared camera (nircam) on the james webb space telescope. we find a significant flux offset between the eight short wavelength detectors, ranging from 1% to 23% (~0.01-0... | the jwst resolved stellar populations early release science program. i. nircam flux calibration |
we present a robust sample of very high redshift galaxy candidates from the first epoch of jwst/nircam imaging from the next generation deep extragalactic exploratory public (ngdeep) survey. the ngdeep nircam imaging, spanning 9.7 arcmin2 in the hubble ultra deep field parallel field 2, reaches m = 30.4 (5σ, point-sour... | ngdeep epoch 1: the faint end of the luminosity function at z 9-12 from ultradeep jwst imaging |
detections from the repeating fast radio burst frb 121102 are clustered in time, noticeable even in the earliest repeat bursts. recently, it was argued that the source activity is periodic, suggesting that the clustering reflected a not-yet-identified periodicity. we performed an extensive multiwavelength campaign with... | repeating behaviour of frb 121102: periodicity, waiting times, and energy distribution |
context. planetary formation and evolution is a combination of multiple interlinked processes. constraining the mechanisms observationally requires statistical comparison to a large diversity of planetary systems.aims: we want to understand global observable consequences of different physical processes (accretion, migr... | the new generation planetary population synthesis (ngpps). ii. planetary population of solar-like stars and overview of statistical results |
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