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titanium isotopes are potential tracers of processes of evaporation/condensation in the solar nebula and magmatic differentiation in planetary bodies. to gain new insights into the processes that control ti isotopic variations in planetary materials, 25 komatiites, 15 chondrites, 11 hed-clan meteorites, 5 angrites, 6 a... | titanium stable isotopic variations in chondrites, achondrites and lunar rocks |
we present new atacama large millimeter array observations of the molecular gas and far-infrared continuum around the brightest cluster galaxy (bcg) in the cool-core cluster macs 1931.8-2635. our observations reveal (1.9 ± 0.3) × 1010 m ⊙ of molecular gas, on par with the largest known reservoirs of cold gas in a clust... | the dust and molecular gas in the brightest cluster galaxy in macs 1931.8-2635 |
in the core accretion paradigm of planet formation, gas giants only form a massive atmosphere after their progenitors exceeded a threshold mass: the critical core mass. most (exo)planets, being smaller and rock/ice-dominated, never crossed this line. nevertheless, they were massive enough to attract substantial amounts... | hydrodynamics of embedded planets' first atmospheres - i. a centrifugal growth barrier for 2d flows |
context. detailed modelling of the high-energy emission from gamma-ray binaries has been propounded as a path to pulsar wind physics.aims: fulfilling this ambition requires a coherent model of the flow and its emission in the region where the pulsar wind interacts with the stellar wind of its companion.methods: we have... | modelling the high-energy emission from gamma-ray binaries using numerical relativistic hydrodynamics |
aims: we present and analyse late-time observations of the type-ib supernova with possible pre-supernova progenitor detection, iptf13bvn, which were done ~300 days after the explosion. we discuss them in the context of constraints on the supernova's progenitor. previous studies have proposed two possible natures for th... | nebular phase observations of the type-ib supernova iptf13bvn favour a binary progenitor |
galactic supernova remnants (snrs) with angular dimensions greater than a few degrees are relatively rare, as are remnants located more than 10° off the galactic plane. here we report a uv and optical investigation of two previously suspected snrs more than 10° in both angular diameter and galactic latitude. one is a p... | far-uv and optical emissions from three very large supernova remnants located at unusually high galactic latitudes |
when a protoplanetary disc loses gas, it leaves behind planets and one or more planetesimal belts. the belts get dynamically excited, either by planets (`planet stirring') or by embedded big planetesimals (`self-stirring'). collisions between planetesimals become destructive and start to produce dust, creating an obser... | self-stirring of debris discs by planetesimals formed by pebble concentration |
we characterize the stellar and gas volume density, potential, and gravitational field profiles in the central ∼0.5 pc of the orion nebula cluster (onc), the nearest embedded star cluster (or rather, protocluster) hosting massive star formation available for detailed observational scrutiny. we find that the stellar vol... | slingshot mechanism for clusters: gas density regulates star density in the orion nebula cluster (m42) |
we present a very large telescope/multi unit spectroscopic explorer (muse) survey of lensed high-redshift galaxies behind the z = 0.77 cluster rcs 0224-0002. we study the detailed internal properties of a highly magnified (μ ∼ 29) z = 4.88 galaxy seen through the cluster. we detect widespread nebular c iv λλ1548,1551 å... | a gravitationally boosted muse survey for emission-line galaxies at z ≳ 5 behind the massive cluster rcs 0224 |
we perform a spectroscopic survey of the foreground population in orion a with mmt/hectospec. we use these data, along with archival spectroscopic data and photometric data, to derive spectral types, extinction values, and masses for 691 stars. using the spitzer space telescope data, we characterize the disk properties... | ngc 1980 is not a foreground population of orion: spectroscopic survey of young stars with low extinction in orion a |
rcw 38 is a deeply embedded young (∼1 myr), massive star cluster located at a distance of 1.7 kpc. twice as dense as the orion nebula cluster, orders of magnitude denser than other nearby star-forming regions and rich in massive stars, rcw 38 is an ideal place to look for potential differences in brown dwarf formation ... | the low-mass content of the massive young star cluster rcw 38 |
a significant fraction of ob-type, main-sequence massive stars are classified as runaway and move supersonically through the interstellar medium (ism). their strong stellar winds interact with their surroundings, where the typical strength of the local ism magnetic field is about 3.5-7 μg, which can result in the forma... | bow shock nebulae of hot massive stars in a magnetized medium |
planets grow via the collisional accretion of small bodies in a protoplanetary disk. such small bodies feel strong gas drag, and their orbits are significantly affected by the gas flow and atmospheric structure around the planet. we investigate the gas flow in the protoplanetary disk perturbed by the gravity of the pla... | the growth of protoplanets via the accretion of small bodies in disks perturbed by the planetary gravity |
we present arcminute-resolution intensity and polarization maps of the galactic center made with the atacama cosmology telescope. the maps cover a 32 deg2 field at 98, 150, and 224 ghz with ∣l∣ ≤ 4°, ∣b∣ ≤ 2°. we combine these data with planck observations at similar frequencies to create coadded maps with increased se... | the atacama cosmology telescope: microwave intensity and polarization maps of the galactic center |
recently, gamma-ray halos of a few degree extension have been detected around two middle-aged pulsars, namely, geminga and psr b0656+14, by the high altitude water cherenkov observatory (hawc). the gamma-ray radiation arises from relativistic electrons that escape the pulsar wind nebula and diffuse in the surrounding m... | morphology of gamma-ray halos around middle-aged pulsars: influence of the pulsar proper motion |
astronomical observations and isotopic measurements of meteorites suggest that substructures are common in protoplanetary disks and may even have existed in the solar nebula. here, we conduct paleomagnetic measurements of chondrules in co carbonaceous chondrites to investigate the existence and nature of these disk sub... | paleomagnetic evidence for a disk substructure in the early solar system |
an episode of dynamical instability is thought to have sculpted the orbital structure of the outer solar system. when modeling this instability, a key constraint comes from jupiter's fifth eccentric mode (quantified by its amplitude m55), which is an important driver of the solar system's secular evolution. starting fr... | born eccentric: constraints on jupiter and saturn's pre-instability orbits |
aims: we study iptf14hls, a luminous and extraordinary long-lived type ii supernova, which lately has attracted much attention and disparate interpretation.methods: we have presented new optical photometry that extends the light curves up to more than three years past discovery. we also obtained optical spectroscopy ov... | late-time observations of the extraordinary type ii supernova iptf14hls |
we present the stromlo stellar tracks, a set of stellar evolutionary tracks, computed by modifying the modules for experiments in stellar astrophysics (mesa) 1d stellar evolution package, to fit the galactic concordance abundances for hot (t > 8000 k) massive (≥10 m⊙) main-sequence (ms) stars. until now, all stellar... | stromlo stellar tracks: non-solar-scaled abundances for massive stars |
we present alma observations on and around the radio-quiet quasar um 287 at z = 2.28. together with a companion quasar, um 287 is believed to play a major role in powering the surrounding enormous lyα nebula (elan), dubbed the slug elan, that has an end-to-end size of 450 physical kpc. in addition to the quasars, we de... | a multiwavelength study of elan environments (amuse2). detection of a dusty star-forming galaxy within the enormous lyα nebula at z=2.3 sheds light on its origin |
we present hubble space telescope (hst) observations of the type iib supernova (sn) sn 2016gkg at 652, 1698, and 1795 days from explosion with the advanced camera for surveys (acs) and wide field camera 3 (wfc3). comparing to pre-explosion imaging from 2001 obtained with the wide field planetary camera 2, we demonstrat... | updated photometry of the yellow supergiant progenitor and late-time observations of the type iib supernova sn 2016gkg |
we present results constraining the multiplicity of the very low mass stars and substellar objects in the orion nebula cluster (onc). our sample covers primary masses 0.012-0.1 m ⊙ using archival hubble space telescope data obtained with the advanced camera for surveys using multiple filters. studying the binary popula... | binary formation in the orion nebula cluster: exploring the substellar limit |
we present here the exploration of the physical properties of the sample of h ii regions and aggregations of the last h ii regions catalogue of the calar alto legacy integral field area (califa) survey. this sample comprises the optical spectroscopic properties of more than ~26 000 ionized regions corresponding to 924 ... | h ii regions in califa survey: ii. the relation between their physical properties and galaxy evolution |
we present the results of two-dimensional radiation-hydrodynamic simulations of expanding supernova ejecta with a central energy source. as suggested in previous multidimensional hydrodynamic simulations, a sufficiently powerful central energy source can blow away the expanding supernova ejecta, leading to efficient mi... | two-dimensional radiation-hydrodynamic simulations of supernova ejecta with a central power source |
recent wide-field integral-field spectroscopy has revealed the detailed properties of high-redshift lyα nebulae, most often targeted due to the presence of an active galactic nucleus (agn). here, we use vlt/muse to resolve the morphology and kinematics of a nebula initially identified due to strong lyα emission at z ~ ... | mapping the morphology and kinematics of a lyα-selected nebula at z = 3.15 with muse |
nebulabayes is a new bayesian code that implements a general method of comparing observed emission-line fluxes to photoionization model grids. the code enables us to extract robust, spatially resolved measurements of abundances in the extended narrow-line regions (enlrs) produced by active galactic nuclei (agn). we obs... | interrogating seyferts with nebulabayes: spatially probing the narrow-line region radiation fields and chemical abundances |
we introduce vlt-muse observations of the central 2'× 2' (30 × 30 pc) of the tarantula nebula in the large magellanic cloud. the observations provide an unprecedented spectroscopic census of the massive stars and ionised gas in the vicinity of r136, the young, dense star cluster located in ngc 2070, at the heart of the... | mapping the core of the tarantula nebula with vlt-muse. i. spectral and nebular content around r136 |
using multi-epoch very large array observations, covering a time baseline of 29.1 years, we have measured the proper motions of 88 young stars with compact radio emission in the core of the orion nebula cluster (onc) and the neighboring bn/kl region. our work increases the number of young stars with measured proper mot... | radio measurements of the stellar proper motions in the core of the orion nebula cluster |
we report on the study of interstellar extinction across the tarantula nebula (30 doradus), in the large magellanic cloud, using observations from the hubble tarantula treasury project in the 0.3-1.6 μm range. the considerable and patchy extinction inside the nebula causes about 3500 red clump stars to be scattered alo... | hubble tarantula treasury project - iv. the extinction law |
we present multi unit spectroscopic explorer (muse) integral field spectroscopic observations of the host galaxy (pgc 043234) of one of the closest (z = 0.0206, d ≃ 90 mpc) and best-studied tidal disruption events (tdes), asassn-14li. the muse integral field data reveal asymmetric and filamentary structures that extend... | muse reveals a recent merger in the post-starburst host galaxy of the tde asassn-14li |
sn 2012ec is a type iip supernova (sn) with a progenitor detection and comprehensive photospheric phase observational coverage. here, we present very large telescope and public eso spectroscopic survey of transient objects observations of this sn in the nebular phase. we model the nebular [o i] λλ6300, 6364 lines and f... | supersolar ni/fe production in the type iip sn 2012ec |
in this paper we compute models for relativistic white dwarfs in the presence of strong magnetic fields. these models possibly contribute to superluminous snia. with an assumed axisymmetric and poloidal magnetic field, we study the possibility of the existence of super-chandrasekhar magnetized white dwarfs by solving n... | effects of strong magnetic fields and rotation on white dwarf structure |
aims: we aim to study the rotating and expanding gas in the red rectangle, which is a well known bipolar nebula surrounding a double stellar system whose primary is a post-asymptotic giant branch (post-agb) star. we analyze the properties of both components and the relation between them. rotating disks have been very e... | further alma observations and detailed modeling of the red rectangle |
it is widely believed that super-eddington accretion flow can produce powerful outflow, but where it originates from and how much mass and energy are carried away to which directions? to answer to these questions, we newly perform a large-box, two-dimensional radiation hydrodynamic simulation, paying special attention ... | outflow from super-eddington flow: where it originates from and how much impact it gives? |
we present the results from a muse survey of twelve z ≃ 3.15 quasars, which were selected to be much fainter (20 < isdss < 23) than in previous studies of giant ly α nebulae around the brightest quasars (16.6 < iab < 18.7). we detect h i> ly α nebulae around 100 per cent of our target quasars, with emiss... | revealing the impact of quasar luminosity on giant ly α nebulae |
we present spectroscopic and photometric observations of the type iip supernova, sn 2020jfo, in ultraviolet and optical wavelengths. sn 2020jfo occurred in the spiral galaxy m61 (ngc 4303), with eight observed supernovae in the past 100 yr. sn 2020jfo exhibited a short plateau lasting < 65 days, and achieved a maxim... | sn 2020jfo: a short-plateau type ii supernova from a low-mass progenitor |
the solar system was once rich in the short-lived radionuclide (slr) 26al but poor in 60fe. several models have been proposed to explain these anomalous abundances in slrs, but none has been set within a self-consistent framework of the evolution of the solar system and its birth environment. the anomalous abundance in... | the formation of solar-system analogs in young star clusters |
we investigate the effect of mixing of radioactive nickel (56ni) on the early-time color evolution of type ib and ic supernovae (sne ib/ic) using multigroup radiation hydrodynamics simulations. we consider both helium-rich and helium-poor progenitors. mixing of 56ni is parameterized using a gaussian distribution functi... | type ib/ic supernovae: effect of nickel mixing on the early-time color evolution and implications for the progenitors |
we report the discovery of a multiply lensed lyman-α blob (lab) behind the galaxy cluster as1063 using the multi unit spectroscopic explorer (muse) on the very large telescope (vlt). the background source is at z = 3.117 and is intrinsically faint compared to almost all previously reported labs. we used our highly prec... | discovery of a faint, star-forming, multiply lensed, lyman-α blob |
we present the analysis and results of a spectroscopic follow-up program of a mass-selected sample of six galaxies at 3< z< 4 using data from keck-nirpsec and vlt-xshooter. we confirm the z> 3 redshifts for half of the sample through the detection of strong nebular emission lines, and improve the z phot accura... | a spectroscopic follow-up program of very massive galaxies at 3 < z < 4: confirmation of spectroscopic redshifts, and a high fraction of powerful agns |
mergers of carbon-oxygen (co) white dwarfs (wds) are considered to be one of the potential progenitors of type ia supernovae (sne ia). recent hydrodynamical simulations showed that the less massive (secondary) wd violently accretes onto the more massive (primary) one, carbon detonation occurs, the detonation wave propa... | the critical mass ratio of double white dwarf binaries for violent merger-induced type ia supernova explosions |
the integral shaped filament (isf) is the nearest molecular cloud with rapid star formation, including massive stars, and it is therefore a star-formation laboratory. we use gaia parallaxes, to show that the distances to young class ii stars ('disks') projected along the spine of this filament are related to the gas ra... | gaia: orion's integral shaped filament is a standing wave |
the δ37cl from different generations of apatite in martian meteorite chassigny has a range of ≈10‰ and is almost as great as measurements made on all martian meteorites (≈14‰). this range represents the mixing of distinct cl isotope reservoirs during the formation of chassigny: (1) an isotopically light-cl mantle reser... | distinct chlorine isotopic reservoirs on mars. implications for character, extent and relative timing of crustal interactions with mantle-derived magmas, evolution of the martian atmosphere, and the building blocks of an early mars |
there is both observational and theoretical evidence that the ejecta of core-collapse supernovae (sne) are structured. rather than being smooth and homogeneous, the material is made of over-dense and under-dense regions of distinct composition. here, we have explored the effect of clumping on the sn radiation during th... | impact of clumping on core-collapse supernova radiation |
context. planetary nebula distance scales often suffer from model-dependent solutions. model-independent trigonometric parallaxes have been rare. space-based trigonometric parallaxes are now available for a larger sample using the second data release of gaia.aims: we aim to derive a high-quality approach for selection ... | planetary nebula distances in gaia dr2 |
recent improvements in stellar models for intermediate-mass stars and massive stars (mss) are recalled, together with their expectations for the synthesis of radioactive nuclei of lifetimes τ ≲ 25 myr, in order to re-examine the origins of now extinct radioactivities that were alive in the solar nebula. the galactic in... | on the origin of early solar system radioactivities: problems with the asymptotic giant branch and massive star scenarios |
we present a new catalog of spectrophotometric distances and line of sight systemic velocities to 103 h ii regions between 90^\circ ≤slant {\ell }≤slant 195^\circ (longitude quadrants ii and part of iii). two new velocities for each region are independently measured using 1 arcmin resolution 21 cm h i and 2.6 mm 12co l... | a cgps look at the spiral structure of the outer milky way. i. distances and velocities to star-forming regions |
context. dense molecular filaments are central to the star formation process, but the detailed manner in which they fragment into prestellar cores is not well understood yet.aims: here, we investigate the fragmentation properties and dynamical state of several star-forming filaments in the x-shaped nebula region of the... | fragmentation of star-forming filaments in the x-shaped nebula of the california molecular cloud |
we report on the first detection of very high-energy gamma-ray emission from the crab nebula by a cherenkov telescope in dual-mirror schwarzschild-couder (sc) configuration. this result has been achieved by means of the 4 m astri-horn telescope, operated on mt. etna, italy, and developed in the context of the cherenkov... | first detection of the crab nebula at tev energies with a cherenkov telescope in a dual-mirror schwarzschild-couder configuration: the astri-horn telescope |
based on a combined analysis of sdss imaging and califa integral field spectroscopy data, we report on the detection of faint (24 <μr mag/□″< 26) star-forming spiral-arm-like features in the periphery of three nearby early-type galaxies (etgs). these features are of considerable interest because they document the... | spiral-like star-forming patterns in califa early-type galaxies |
the crab pulsar has striking radio emission properties, with the two dominant pulse components-the main pulse and the interpulse-consisting entirely of giant pulses. the emission is scattered in both the crab nebula and the interstellar medium, causing multipath propagation and thus scintillation. we study the scintill... | resolving the emission regions of the crab pulsar's giant pulses |
the next generation of spectroscopic surveys will target emission-line galaxies (elgs) to produce constraints on cosmological parameters. we study the large-scale structure traced by elgs using a combination of a semi-analytical model of galaxy formation, a code that computes the nebular emission from h ii regions usin... | the assembly bias of emission-line galaxies |
context. blazars are variable sources on various timescales over a broad energy range spanning from radio to very high energy (>100 gev, hereafter vhe). mrk 501 is one of the brightest blazars at tev energies and has been extensively studied since its first vhe detection in 1996. however, most of the γ-ray studies p... | multiwavelength observations of mrk 501 in 2008 |
we have commenced a detailed analysis of the known sample of galactic post-asymptotic giant branch (pagb) objects compiled in the toruń catalogue of szczerba et al., and present, for the first time, homogeneously derived distance determinations for the 209 likely and 87 possible catalogued pagb stars from that compilat... | new light on galactic post-asymptotic giant branch stars - i. first distance catalogue |
the formation of wolf-rayet central stars of planetary nebulae ([wr] cspne) whose spectroscopic appearance mimics massive wr stars remains poorly understood. least understood is the nature and frequency of binary companions to [wr] cspne that may explain their h-deficiency. we have conducted a systematic radial velocit... | a radial velocity survey for post-common-envelope wolf-rayet central stars of planetary nebulae: first results and discovery of the close binary nucleus of ngc 5189 |
using 1d, non-local thermodynamic equilibrium and time-dependent radiative transfer simulations, we study the ejecta properties required to match the early- and late-time photometric and spectroscopic properties of supernovae (sne) associated with long-duration γ-ray bursts (lgrbs). matching the short rise time, narrow... | radiative-transfer models for explosions from rotating and non-rotating single wc stars. implications for sn 1998bw and lgrb/sne |
preplanetary nebulae and planetary nebulae are evolved, mass-losing stellar objects that show a wide variety of morphologies. many of these nebulae consist of outer structures that are nearly spherical (spiral/shell/arc/halo) and inner structures that are highly asymmetric (bipolar/multipolar) 1,2 . the coexistence of ... | the large-scale nebular pattern of a superwind binary in an eccentric orbit |
context. the morphology and the distribution of material observed in supernova remnants (snrs) reflect the interaction of the supernova (sn) blast wave with the ambient environment, the physical processes associated with the sn explosion, and the internal structure of the progenitor star. ic 443 is a mixed-morphology (... | modeling the mixed-morphology supernova remnant ic 443. origins of its complex morphology and x-ray emission |
m16, the eagle nebula, is an outstanding hii region where extensive high-mass star formation is taking place in the sagittarius arm, and hosts the remarkable "pillars" observed with hst. we made new co observations of the region in the 12co j=1--0 and j=2--1 transitions with nanten2. these observations revealed for the... | a new view of the giant molecular cloud m16 (eagle nebula) in 12co j=1-0 and 2-1 transitions with nanten2 |
we characterize local large-scale regular magnetic fields as well as small-scale magnetic features in the solar vicinity by using the rotation measures of 494 pulsars within 3 kpc from the sun. the local magnetic field in the galactic disc is found to follow local spiral arms and to have a field strength of 1.6 μg, wit... | magnetic fields in the solar vicinity and in the galactic halo |
most of the exoplanets with known masses at earth-like distances to sun-like stars are heavier than jupiter, which raises the question of whether such planets are accompanied by detectable, possibly habitable moons. here we simulate the accretion disks around super-jovian planets and find that giant moons with masses s... | water ice lines and the formation of giant moons around super-jovian planets |
we present a radiative transfer code to model the nebular phase spectra of supernovae (sne) in non-lte (nlte). we apply it to a systematic study of sne ia using parameterized 1d models and show how nebular spectral features depend on key physical parameters, such as the time since explosion, total ejecta mass, kinetic ... | how do type ia supernova nebular spectra depend on explosion properties? insights from systematic non-lte modeling |
as part of the global view on star formation (glostar) survey we have used the karl g. jansky very large array (vla) in its b-configuration to observe the part of the galactic plane between longitudes of 28° and 36° and latitudes from −1° to +1° at the c-band (4-8 ghz). to reduce the contamination of extended sources t... | a global view on star formation: the glostar galactic plane survey. vi. radio source catalog ii: 28° < ℓ < 36° and |b| < 1°, vla b-configuration |
it has been shown that some aspects of the terrestrial planets can be explained, particularly the earth/mars mass ratio, when they form from a truncated disk with an outer edge near 1.0 au. this has been previously modeled starting from an intermediate stage of growth utilizing pre-formed planetary embryos. we present ... | terrestrial planet formation from an annulus |
context. the orion complex is arguably the most studied star-forming region in the galaxy. while stars are still being born in the orion nebula, the oldest part was believed to be no more than 13 myr old.aims: in order to study the full hierarchy of star formation across the orion complex, we perform a clustering analy... | discovery of a 21 myr old stellar population in the orion complex⋆ |
thulium is a heavy rare earth element (ree) whose geochemical behavior is intermediate between er and yb, and that is not expected to be decoupled from these elements during accretion of planetary bodies and geological processes. however, irregularities in ree volatilities at higher temperature could have decoupled the... | evidence from tm anomalies for non-ci refractory lithophile element proportions in terrestrial planets and achondrites |
context. stars in the solar neighbourhood have refractory element ratios slightly different from that of the sun. it is unclear how much the condensation of solids and thus the composition of planets forming around these stars is affected.aims: we aim to understand the impact of changing the ratios of the refractory el... | forming planets around stars with non-solar elemental composition |
using offset-corrected gaia edr3 parallax measurements and spectrophotometric methods, we have determined distances for 69 massive stars in the carina ob1 association and associated clusters: trumpler 16 (21 stars), trumpler 14 (20 stars), trumpler 15 (three stars), bochum 11 (five stars), and south pillars region (20 ... | gaia edr3 parallax distances to the great carina nebula and its star clusters (trumpler 14, 15, 16) |
the unidentified tev source mgro j1908+06, with emission extending from hundreds of gev to beyond 100 tev, is one of the most intriguing sources in the galactic plane. mgro j1908+06 spatially associates with an icecube hotspot of neutrino emission. although the hotspot is not significant yet, this suggests a possible h... | investigating the nature of mgro j1908+06 with multiwavelength observations |
the central area (40″ × 40″) of the bipolar nebula s106 was mapped in the [o i] line at 63.2 μm (4.74 thz) with high angular (6″) and spectral (0.24 mhz) resolution, using the great heterodyne receiver on board sofia. the spatial and spectral emission distribution of [o i] is compared to emission in the co 16 →15, [c i... | anatomy of the massive star-forming region s106. the [o i] 63 μm line observed with great/sofia as a versatile diagnostic tool for the evolution of massive stars |
we report the discovery of a young (only 30-40 myr) snake-like structure (dubbed a stellar snake) in the solar neighborhood from gaia dr2. the average distance of this structure is about 310 pc from us. both the length and width are over 200 pc, but the thickness is only about 80 pc. the snake has one tail and two diss... | discovery of a young stellar snake with two dissolving cores in the solar neighborhood |
we conduct a three-dimensional hydrodynamical simulation to study the interaction of two opposite inclined jets inside the envelope of a giant star, and find that the jets induce many vortexes inside the envelope and that they efficiently remove mass from the envelope and form a very clumpy outflow. we assume that this... | inclined jets inside a common envelope of a triple stellar system |
we present a sample of local analogs for high-redshift galaxies selected in the sloan digital sky survey (sdss). the physical conditions of the interstellar medium (ism) in these local analogs resemble those in high-redshift galaxies. these galaxies are selected based on their positions in the [o iii]/hβ versus [n ii]/... | local analogs for high-redshift galaxies: resembling the physical conditions of the interstellar medium in high-redshift galaxies |
we present synthetic observations for the first generations of galaxies in the universe and make predictions for future deep field observations for redshifts greater than 6. due to the strong impact of nebular emission lines and the relatively compact scale of h ii regions, high-resolution cosmological simulations and ... | first light: exploring the spectra of high-redshift galaxies in the renaissance simulations |
we report a detailed analysis of all regions of current star formation in the walls of the supergiant h i shell (sgs) in the galaxy holmberg ii based on observations with a scanning fabry-perot interferometer at the russian 6-m telescope. we compare the structure and kinematics of ionized gas with that of atomic hydrog... | complexes of triggered star formation in supergiant shell of holmberg ii |
context. the winds of massive stars create large (>10 pc) bubbles around their progenitors. as these bubbles expand they encounter the interstellar coherent magnetic field which, depending on its strength, can influence the shape of the bubble.aims: we wish to investigate if, and how much, the interstellar magnetic ... | shape and evolution of wind-blown bubbles of massive stars: on the effect of the interstellar magnetic field |
bright lyα blobs (labs)—extended nebulae with sizes of ∼100 kpc and lyα luminosities of ∼1044 erg s-1—often reside in overdensities of compact lyα emitters (laes) that may be galaxy protoclusters. the number density, variance, and internal kinematics of labs suggest that they themselves trace group-like halos. here, we... | discovery of a protocluster associated with a lyα blob pair at z = 2.3 |
context. hess j1809−193 is an unassociated very-high-energy γ-ray source located on the galactic plane. while it has been connected to the nebula of the energetic pulsar psr j1809−1917, supernova remnants and molecular clouds present in the vicinity also constitute possible associations. recently, the detection of γ-ra... | hess j1809−193: a halo of escaped electrons around a pulsar wind nebula? |
the messenger interface monte carlo mappings v (m3) is a photoionization code adopting the fully self-consistent monte carlo radiative transfer (mcrt) technique, which presents a major advance over previous photoionization models with simple geometries. m3 is designed for modeling nebulae in arbitrary three-dimensional... | messenger monte carlo mappings v (m3)-a self-consistent, three-dimensional photoionization code |
in this work, we have discussed a spatially homogeneous and anisotropic bianchi type-i space-time in the presence of barrow holographic dark energy (infrared cut-off is the hubble’s horizon) proposed by barrow recently [j. d. barrow, phys. lett. b 808, 135643 (2020).] and matter in the framework of f(q) gravity where t... | bianchi type-i barrow holographic dark energy model in symmetric teleparallel gravity |
we report results from chandra observations analyzed for evidence of variability and proper motion in the x-ray jet of centaurus a. using data spanning 15 yr, collective proper motion of 11.3 ± 3.3 mas yr-1, or 0.68 ± 0.20c, is detected for the fainter x-ray knots and other substructure present within the jet. the thre... | variability and proper motion of x-ray knots in the jet of centaurus a |
lyman-α nebulae are typically found in massive environments at high redshift (z ≳ 2). the origin of their lyman-α (lyα) emission remains debated. recent polarimetric observations showed that at least some lyα sources are polarized. this is often interpreted as proof that the photons are centrally produced and contradic... | lyman-α blobs: polarization arising from cold accretion |
we report multiwavelength observations and characterization of the ultraluminous transient at 2021lwx (ztf20abrbeie; aka "barbie") identified in the alert stream of the zwicky transient facility (ztf) using a recommender engine for intelligent transient tracking filter on the antares alert broker. from a spectroscopica... | scary barbie: an extremely energetic, long-duration tidal disruption event candidate without a detected host galaxy at z = 0.995 |
constraining the evolution of pb isotopes in the bulk silicate earth (bse) is hampered due to the lack of a direct determination of earth's u/pb and initial pb isotope composition. all estimates of these parameters are strongly model dependent and most pb evolution models start with a meteoritic source, i.e., the primo... | the pb isotope evolution of bulk silicate earth: constraints from its accretion and early differentiation history |
ck vulpeculae was observed in outburst in 1670-1672 (ref. 1), but no counterpart was seen until 1982, when a bipolar nebula was found at its location. historically, ck vul has been considered to be a nova (nova vul 1670), but its similarity to `red transients', which are more luminous than classical novae and thought t... | nuclear ashes and outflow in the eruptive star nova vul 1670 |
we find the central stars (css) of the planetary nebulae (pne) hatr 7 and eso 330-9 to be close-binary systems. both have orbital periods of less than half a day and contain an irradiated cool companion to the hot cs. we provide light curves, spectra, radial velocity curves, orbital periods, and binary modeling results... | binary central stars of planetary nebulae discovered through photometric variability. v. the central stars of hatr 7 and eso 330-9 |
eta carinae (η car) is an extremely massive binary system in which rapid spectrum variations occur near periastron. most notably, near periastron the he ii λ4686 line increases rapidly in strength, drops to a minimum value, then increases briefly before fading away. to understand this behavior, we conducted an intense ... | he ii λ4686 emission from the massive binary system in η car: constraints to the orbital elements and the nature of the periodic minima |
we present first results from multi unit spectroscopic explorer (muse) observations at the very large telescope in the muse ultra deep field (mudf), a ≈1.2 × 1.4 arcmin2 region for which we are collecting ≈200 hours of integral field spectroscopy. the ≈40-h observation completed to date reveals the presence of a group ... | the muse ultra deep field (mudf) - i. discovery of a group of lyα nebulae associated with a bright z ≈ 3.23 quasar pair |
the crab nebula is one of the most efficient accelerators in the galaxy and the only galactic source showing direct evidence of pev particles. in spite of this, the physical process behind such effective acceleration is still a deep mystery. while particle acceleration, at least at the highest energies, is commonly tho... | constraints on particle acceleration sites in the crab nebula from relativistic magnetohydrodynamic simulations |
emission signatures from galactic winds provide an opportunity to directly map the outflowing gas, but this is traditionally challenging because of the low surface brightness. using very deep observations (27 h) of the hubble deep field south with the multi unit spectroscopic explorer (muse) instrument, we identify sig... | galactic winds with muse: a direct detection of fe ii* emission from a z = 1.29 galaxy |
the first water cherenkov detector of the lhaaso experiment (wcda-1) has been operating since april 2019. the data for the first year have been analyzed to test its performance by observing the crab nebula as a standard candle. the wcda-1 achieves a sensitivity of 65 mcu per year, with a statistical threshold of 5 $\si... | performance of lhaaso-wcda and observation of the crab nebula as a standard candle |
the magellanic clouds are uniquely placed to study the stellar contribution to dust emission. individual stars can be resolved in these systems even in the mid-infrared, and they are close enough to allow detection of infrared excess caused by dust. we have searched the spitzer space telescope data archive for all infr... | spitzer infrared spectrograph point source classification in the small magellanic cloud |
there is no conclusive explanation of why ∼80 per cent of planetary nebulae (pne) are non-spherical. in the binary hypothesis, a binary interaction is a preferred channel to form a non-spherical pn. a fundamental step to corroborate or disprove the binary hypothesis is to estimate the binary fraction of central stars o... | the binary fraction of planetary nebula central stars - ii. a larger sample and improved technique for the infrared excess search |
a growing body of evidence indicates that binary neutron-star mergers are the primary origin of heavy elements produced exclusively through rapid neutron capture1-4 (the `r-process'). as neutron-star mergers occur infrequently, their deposition of radioactive isotopes into the pre-solar nebula could have been dominated... | a nearby neutron-star merger explains the actinide abundances in the early solar system |
we report optical integral-field spectroscopy in the field of one of the most luminous quasars in the z < 1 universe, pks 0454-22, with the multi-unit spectroscopic explorer. these data enable the discovery of three large ionized nebulae emitting in [o ii], h β, and [o iii] with projected areas of 1720, 1520, and 13... | discovery and origins of giant optical nebulae surrounding quasar pks 0454-22 |
the international gamma-ray astrophysics laboratory (integral) continues to successfully work in orbit after its launch in 2002. the mission provides the deepest ever survey of hard x-ray sources throughout the galaxy at energies above 20 kev. we report on a catalogue of new hard x-ray source candidates based on the la... | new hard x-ray sources discovered in the ongoing integral galactic plane survey after 14 yr of observations |
we perform a comparative study between the only radio-detected type i superluminous supernova (slsn) ptf10hgi, and the most active repeating fast radio burst frb121102. this study has its root in the hypothesized frb-slsn connection that states that magnetars born in slsn can power frbs. the wide-band spectrum (0.6-15 ... | radio emission from a decade old type i superluminous supernova, ptf10hgi: comparison with frb121102 |
magnetic fields of order 101-102 gauss that are present in the envelopes of red giant stars are ejected in common envelope scenarios. these fields could be responsible for the launching of magnetically driven winds in protoplanetary nebulae. using 2d simulations of magnetized winds interacting with an envelope drawn fr... | common envelope shaping of planetary nebulae. ii. magnetic solutions and self-collimated outflows |
we investigate the dust attenuation in both stellar populations and ionized gas in kiloparsec-scale regions in nearby galaxies using integral field spectroscopy data from manga mpl-9. we identify star-forming (h ii) and diffuse ionized gas (dig) regions from manga data cubes. from the stacked spectrum of each region, w... | estimating dust attenuation from galactic spectra. ii. stellar and gas attenuation in star-forming and diffuse ionized gas regions in manga |
we reassess the historical lx/lbol relation for early-type stars from a comparison between t-rex, the chandra acis x-ray survey of the tarantula nebula in the large magellanic cloud (lmc), and contemporary spectroscopic analysis of massive stars obtained primarily from vlt/flames, vlt/muse, and hst/stis surveys. for 10... | x-ray properties of early-type stars in the tarantula nebula from t-rex |
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