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in our best current understanding of the growth of structure in the universe, visibly complex distributions of gas and stars form and evolve into a wide range of galaxies inside overdensities of dark matter. re-creating the observed diversity in the organization of baryonic mass within dark matter halos represents a ke... | baryonic distributions in galaxy dark matter halos |
califa (calar alto legacy integral field area) is a 3d spectroscopic survey of 600 nearby galaxies that we are obtaining with ppak@3.5m at calar alto (sánchez et al. 2012; husemann et al. 2012). this pioneer survey is providing valuable clues on how the mass and metallicity grow in the different galactic spatial sub-co... | the growth of mass and metallicity in bulges and disks: califa perspective |
we present the atomic neutral hydrogen (hi) stacked spectra of different galaxy populations selected by colour and/or agn/star-forming properties. the hi observations were carried out with the westerbork synthesis radio telescope (wsrt) in the redshift range 0<z<0.12. in the observed volume, about 1600 galaxies h... | vizier online data catalog: global hi content from a stacking experiment (gereb+, 2015) |
feedback, a process by which gas is expelled or heated too much for new star formation to occur, is required in galaxy formation simulations to truncate star formation and form galaxies with properties that we observe today. winds from agn or supernovae after a burst of new star formation can blow out circumnuclear gas... | the coevolutionary history of agn and galaxies through age estimates of radio agn |
highly obscured agn, especially compton-thick (ct) agn, likely play a key role in the galaxy-agn co-evolution scenario. they would comprise the early stages of agn activity, preceding the agn-feedback/star-formation quenching phase, during which most of both the smbh and galaxy growth take place. however, the actual ct... | the compton-thick agn fraction from the deepest x-ray spectroscopy in the cdf-s |
almost every galaxy has a supermassive black hole (smbh) residing at its center, the milky way included. recent studies suggested that these unique places are expected to host a high abundance of stellar and compact object binaries. these binaries form hierarchical triple systems with the smbh, and undergo the eccentri... | gravitational-wave signatures from compact object binaries in the galactic center |
observations of the galaxy population throughout the cosmic time have suggested an evolution scenario where galaxies evolve from blue and star-forming, to red and quiescent as star formation is quenched and gas is consumed in stars or becomes unavailable for stellar synthesis. though multiple mechanisms have been shown... | a multiwavelength view of ic 860: what is in action inside quenching galaxies |
we investigate the stellar populations and ionized gas properties of a sample of central spheroidal galaxies in order to better constrain their history of star formation and gas excitation mechanism. we select galaxies from spheroids panchromatic investigation in different environmental regions (spider) catalogue and s... | stellar populations and ionized gas in central spheroidal galaxies |
we present a detailed study of the x-ray point source populations of the nearby, star-forming, spiral galaxy m81. using deep hst data, we uniquely classify the x-ray binary (xrb) populations on the basis of their donor stars and local stellar populations. while this analysis is focused on chandra observations most sens... | the x-ray binary populations of m81 and m82 |
in asymptotic giant branch (agb) stars, 22ne plays an important role in several nucleosynthesis processes, with its production competing with the synthesis of 19f through the so called `poisoning reaction', and the following transfer into 25mg acting as the main neutron sources for the heavy element s-process, affectin... | investigation of high-lying (alpha, gamma) resonances in 22ne through one-neutron transfer in inverse kinematics at tigress |
we have obtained deep g, r, and i-band subaru and ultra-deep 3.6 μm irac images of parts of the multiply-wrapped stellar stream around the nearby edge-on galaxy ngc 5907. we have fitted the surface brightness measurements of the stream with fsps stellar population synthesis models to derive the metallicity and age of t... | imaging of ngc 5907's stellar stream |
the origin of half of the elements heavier than iron -- the so-called r-process elements -- is a central unsolved mystery in astrophysics. these atoms include both precious metals (e.g. gold) as well as radioactive elements required for geophysical processes on the earth (e.g. thorium) and even some which are necessary... | do collapsars make the heavy elements: a sensitive search in a nearby gamma-ray burst? |
we present a stellar population synthesis study of a sample of 10 post-starburst quasars (psqs) at z ∼ 0.3. these broad-lined active galactic nuclei (agns) possess the spectral signatures of massive intermediate-aged stellar populations, making them potentially useful for studying the connections between nuclear activi... | the stellar population of post-starburst quasars |
we present a hydrostatic analysis of the azimuthally averaged hot intracluster medium (icm) of the entire virial region of the relaxed fossil cluster rxj 1159+5531. for a model consisting of icm, stellar mass from the central galaxy (bcg), and an nfw dark matter (dm) halo, we obtain a good description of the projected ... | the radial mass profile within the entire virial region of a fossil cluster |
observations of nearby star-forming regions suggest that binary stars are common, even representing the majority of massive stars. their evolutionary effects result in harder spectral energy distributions, generation of h i-ionizing radiation for longer times, and higher lyman continuum escape fractions from galaxies t... | the effects of binary stars on galaxies and the cgm during reionization |
it is now well-established that conventional type ia supernova (sn ia) light-curve standardization techniques leave residual correlations with properties of the host galaxy. however, various studies have shown that the strength and direction of these correlations depend on the method used and sn sample being analyzed. ... | investigating the sample-dependence of the host galaxy bias with ∼1500 nearby type ia supernovae used for cosmological analyses |
in the era of large scale surveys, including lsst and gaia, binary population studies will flourish due to the large influx of data. in addition to probing binary populations as a function of galactic latitude, under-sampled groups such as low mass binaries will be observed at an unprecedented rate. to prepare for thes... | synthetic survey of the kepler field |
while the imparting of velocity `kicks' to compact remnants from supernovae is widely accepted, the relationship of the `kick' to the progenitor is not. we propose the `kick' is predominantly a result of conservation of momentum between the ejected and compact remnant masses. we propose the `kick' velocity is given by ... | is the link between the observed velocities of neutron stars and their progenitors a simple mass relationship? |
resolved sfh of the lmc determined from fitting models computed with the triegal population synthesis model (girardi et al, 2005a&a...436..895g) to data from the vista survey of the magellanic clouds (cioni et al., 2011a&a...527a.116c, cat. ii/351). (6 data files). | vizier online data catalog: vmc survey xliii. lmc star formation history (mazzi+, 2021) |
the data we used for this study include the galex nuv and fuv, spitzer irac 3.6um, 4.5um, 5.8um, 8.0um, and spitzer mips 24um data used in smith+ (2016aj....151...63s). for the current study, for the 37 out of 46 galaxy pairs, and the 31 out of 38 spirals with optical sloan digitized sky survey (sdss) images we used th... | vizier online data catalog: stellar population synthesis of clumps (zaragoza-cardiel+, 2018) |
galaxies at the peak of cosmic star formation (z ∼ 2‑3) are fundamentally different from local galaxies, in terms of the properties of their massive stellar populations and physical conditions in the interstellar medium (ism). this thesis presents a detailed analysis of the stellar and nebular properties of high-redshi... | leveraging the rest-ultraviolet and rest-optical spectra of galaxies at 2 < z< 3 |
x-ray binaries (xbrs) are testbeds for modeling binary and stellar evolution. be xrbs are the most numerous subclass of observed high-mass xrbs, containing be donors with neutron star (ns) and black hole (bh) companions. while the exact mechanism responsible for the be phenomenon remains under debate, stellar rotation ... | modeling galactic be x-ray binaries with posydon |
one of the biggest questions in gravitational wave (gw) astronomy today is: ``how do these sources form?'' and ``what can we learn from their gws about the birth, lives and explosive deaths of massive stars?'' new gw observing runs and next-generation detectors will rapidly provide data with ever-increasing precision a... | what can we learn from population synthesis and theory in the near-future big data gravitational wave era |
cosmic (compact object synthesis and monte carlo investigation code) cosmic is a rapid binary population synthesis suite with a special purpose of generating realistic compact binary populations. cosmic can also be used to evolve binaries with bse in a python environment. cosmic currently implements binary evolutionary... | cosmic-popsynth/cosmic: 2.0.0 |
integrated light spectroscopy from galaxies is used to study stellar populations that cannot be resolved into individual stars. these analyses often rely on stellar population synthesis (sps) techniques. however, the spectral templates available for sps methods are limited, especially in the near-infrared. we present a... | the apogee library of infrared ssp templates (a-list): high-resolution simple stellar population spectral models in the h-band |
the, so far, unique and well constrained trappist-1 system can be exploited for testing planet formation theories. because of observational biases, terrestrial planet formation models will, for the next decade, only be testable around low mass stars, showing the need for research in this area. we invoke the bern model ... | reproducing the architecture of trappist-1 using global formation and evolution models |
one of our deepest windows into the universe at far-infrared (fir) wavelengths between 70 and 500 microns is in the candels/3d-hst extragalactic fields, owing to a huge investment of the spitzer and herschel space observatory resources. while public firselected catalogs exist for almost all herschel surveys in these fi... | 3d-herschel: completing the candels/3d-hst legacy with a new bayesian framework for deriving galaxy properties |
the study of orbital resonances allows for the constraint of planetary properties of compact systems. mean motion resonance occurs when two or more planets repeatedly exchange angular momentum and energy as they orbit their host star, since the planets will always conjunct at the same point in their orbits. we can pred... | new python package to find, confirm, and characterize mean motion resonances |
lambda boo-type stars are a group of late b to early f-type population i dwarfs that show mild to extreme deficiencies of iron-peak elements (up to 2 dex), but their c, n, o, and s abundances are near solar. we show that the international ultraviolet explorer (iue) spectra (1280-3200 a) of lambda bootis, 29 cygni (a "c... | ultraviolet synthetic spectra for three lambda bootis stars |
hii regions are the archetypical tracers of high-mass star formation. because of their high luminosities, they can be seen across the entire galactic disk from mid-infrared to radio wavelengths. a uniformly sensitive survey of galactic hii regions would allow us to constrain the properties of galactic structure and sta... | a complete census of the ~7000 milky way hii regions |
the field of gravitational-wave astronomy has been initiated by the recent observations of binary black hole mergers. these observations illuminate objects that are inaccessible with electromagnetic telescopes, and open inquiries as to how binary black hole systems form and merge. two possible formation channels propos... | discriminating formation channels of binary black hole systems with advanced ligo |
we have modeled the luminosity-displacement correlation of high-mass x-ray binaries (hmxbs) with an evolutionary population synthesis (eps) code. detailed properties including offsets of simulated hmxbs are presented under both common envelope prescriptions usually adopted (i.e., the αce formalism and the γ algorithm),... | constraints from luminosity-displacement correlation of high-mass x-ray binaries |
surveys of star-forming galaxies are discovering more and more evidence that stellar populations produce harder ionizing emission than what standard spectral population synthesis models predict - sufficient to fully ionize helium and produce heii emission lines. especially in the era of jwst, this ionizing emission pla... | the he++ ionizing flux from stars stripped in binaries: from nearby ionized bubbles to escape into the intergalactic medium |
i will discuss recent efforts to quantify the evolution of x-ray binary (xrb) populations through cosmic time using the 6 ms chandra deep field-south (cdf-s) survey. the formation of xrbs is sensitive to galaxy properties like stellar age and metallicity---properties that have evolved significantly in the broader galax... | x-ray evolution of normal galaxies in the 6 ms chandra deep field-south |
the hubble ultra deep field and frontier fields have discovered over 1,500 galaxies at redshifts greater than 6. we present observational predictions for this high-redshift population, using the renaissance simulations, a suite of high-resolution cosmological simulations, that enables the correlation between key observ... | physical and observable properties of the first galaxies |
in this work, our aim is to investigate the stellar populations and stellar ages of a subsample of far- infrared (fir) active galactic nucleus (agn) and non-agn green valley galaxies at 0.6 < z < 1.0 using the data from the cosmological evolution survey field. we used long-slit spectroscopy and derived stellar po... | stellar populations of a sample of far- infrared agn and non- agn green valley galaxies |
binary interactions, especially mass transfer and mergers, can strongly influence the evolution of massive stars and change their final properties and the occurrence of supernovae. here, we investigate how binary interactions affect predictions of the diffuse flux of neutrinos. by performing stellar population synthese... | impact of binary interactions on the diffuse supernova neutrino background |
using hard x-ray observations attainable with nustar, we are able to differentiate between the accretion states, and thus compact object types, of x-ray binaries (xrbs) in the andromeda galaxy, our nearest spiral neighbor. because they are directly connected to past and current stellar populations through binary synthe... | a nustar view of the hard x-ray binary population of the m31 disk |
many hot jupiters (hjs) have been observed to have large obliquities or misalignments between the stellar spin axis and the orbital angular momentum of the planet. this observation hints that at least a portion of hjs formed through high-eccentricity migration, in which a cold jupiter is excited onto a highly eccentric... | forming perpendicular hot jupiter systems via high-eccentricity migration |
we will present detailed constraints on the metallicity dependence of the high mass x-ray binary (hmxb) x-ray luminosity function (xlf). we analyze ~5 ms of chandra data for 55 actively star-forming galaxies at d < 30 mpc with gas-phase metallicities spanning 12 + log(o/h) ~ 7-9.2. within the galactic footprints, ou... | the metallicity dependence of the high-mass x-ray binary luminosity function |
many astrophysical systems, such as stellar binaries, require detailed numerical simulations to model. to explore the effects of uncertain parameters on final outcomes, we often use regularly spaced grids of simulations where the density and spacings are arbitrarily chosen using some combination of intuition, visual in... | a new active-learning algorithm for more efficient parameter space studies, paving the way toward next-generation binary population synthesis. |
the stellar initial mass function (imf) is a fundamental ingredient in stellar population synthesis models and for decades it was considered to be universal. however, the universality of the imf has been recently challenged by detailed stellar population modeling of massive early-type galaxies. i this talk i will prese... | imf variations in the fornax cluster |
binary population synthesis models suggest that x-ray emission from star-forming galaxies, consisting primarily of emission from x-ray binaries (xrbs) and the hot interstellar medium (ism), will be the dominant source of high-energy photons at high redshift. cosmological models further suggest that in the early univers... | the x-ray spectral energy distribution of the low-metallicity starburst galaxy vv 114 |
the epoch of reionization and cosmic dawn, at (z>6) is the next big frontier for galaxy studies. however, understanding which sources are relevant to ionization at these great distances requires a more detailed investigation of star formation in young, very lowmetallicity regions. spectroscopic observations of (z>... | the nature of high ionization emission line galaxies near and far: a reckoning of all the energetic processes from stellar populations to shocks |
accreting white dwarfs (wds) in cataclysmic variables (cvs) are the critical component in the single degenerate pathway to type ia supernovae (sne ia), along with the double degenerate merger pathway, and they provide the standard candles of cosmology proving that the expansion rate of the universe is accelerating and ... | the masses, rotational velocities and chemical abundances of white dwarfs in cataclysmic variables |
the α - elements abundance provides an important fossile signature in galactic archeology to trace the chemical evolution of the different disk populations. however, a precise abundance estimation in the metal-rich disk ([m/h] ≥ 0 dex) is still complex due to the presence of blended lines and the difficulty in the cont... | precise magnesium abundances in the metal-rich disk |
we study the effects of including binary star evolution in population synthesis models. we use the hurley et al. (2002) code to compute binary star evolutionary tracks, and follow the procedure by han et al. (2002), in particular, the two 2hewd merger channel, to form ehb stars from a binary pair. we apply the resultin... | extreme horizontal branch stars in passively evolving early type galaxies |
there appears to be correlations between sn ia hubble diagram residuals and host galaxy mass, metallicity, and star formation history. an uncorrected bias may produce a systematic offset in cosmological measurements. global properties are the luminosity average of local environments, therefore the properties of local e... | correlations between hubble residuals and mcmc estimated local stellar ages of type ia supernovae |
after light-curve calibration using the phillips relation, the distance to an individual type ia supernova (sn ia) can be inferred with ~5% precision. distance measurements enable type ia supernovae (sne ia), the highly luminous explosions of white dwarf stars, to be used as powerful tools to address two open questions... | an unsteady rung: matching samples of type ia supernovae in cepheid hosts and the hubble flow to measure h0 |
due to the light of their companions, binary cepheids might seem over-luminous and appear above the period-luminosity relation (plr). this systematic effect introduces a shift in the plr zero-point towards smaller magnitudes. we present quantitative results on the impact that companions to classical cepheids have on th... | the impact of binary cepheids on the distance determinations |
we present a framework for estimating exoplanet occurrence rates by synthesizing constraints from radial velocity and transit surveys simultaneously. we employ forward modeling with approximate bayesian computation and mass-radius (m-r) relations of varying complexity to explore the population models describing these s... | combining transit and rv: a synthesized population model |
we request a 190 ks chandra acis-i observation of the spiral galaxy m96 to study the role of dynamics at local and global (galaxy) scales in x-ray binary (xrb) formation and evolution. we will determine if there is an enhancement in the xrb population on local scales per stellar mass and star formation rate. we will le... | x-ray binaries 1 gyr after a collision: a chandra study of m96 (ngc 3368) |
carbon, oxygen and iron are among the most interesting elements in astrophysics. they play an important role as diagnostics of stellar populations and galactic chemical evolution. here, we present the trends of [c/h], [c/fe] and [c/mg] vs [fe/h] and [mg/h] for a large sample of about 2000 fgk dwarfs in the solar neighb... | carbon in the galactic disks |
binary stars are ubiquitous in the universe. measuring binary fractions and their variations in different stellar populations has important implications in the studies of a number of research fields including star formation and evolution, gravitational wave detections, galactic structure and stellar population synthesi... | binary fractions based on the lamost rgb and rc data |
we describe a homogeneous catalog compilation of common proper motion stars based on gaiadr2. a preliminary list of all pairs of stars within the radius of 100pc around the sun with a separation less than a parsec was compiled. also, a subset of comoving pairs, wide binary stars, was selected. the clusters and systems ... | vizier online data catalog: binary star pop. with common proper motion (sapozhnikov+, 2020) |
we present state of the art population synthesis models that improve on the following aspects with respect to most available models. (a) treatment of the uv spectral range, including new evolutionary tracks and updated treatment of the ionizing radiation emitted by the stellar population. (b) improved treatment of tp-a... | state of the art population synthesis models |
the thick disc is a major component of the milky way but its epoch of formation and characteristics are still not yet well constrained. the besançon galaxy model (bgm, robin et al. 2003) is a population synthesis model based on a scenario of formation and evolution of the galaxy, a star formation history, and a set of ... | study of the thick disc of the milky way from a population synthesis model |
the formation of blue straggler stars (bsss), commonly categorized as stars bluer and brighter than the main sequence turnoff, has puzzled astronomers since their first detection over sixty years ago. the well-studied bss population of the old (7 gyr) open cluster ngc 188 has the potential to settle outstanding issues ... | the mass-transfer formation frequency of blue straggler stars in the old open cluster ngc 188 |
the stellar classification code galclassify is a stand-alone version of galaxia (ascl:1101.007). it classifies and generates a synthetic population for each star using input containing observables in a fixed format rather than using a precomputed population over a large field. it is suitable for individual stellar clas... | galclassify: stellar classifications using a galactic population synthesis model |
the galex ultraviolet (uv) sky surveys are uniquely sensitive to classes of astrophysical objects such as hot stars, star-forming galaxies, and z < 2.4 qsos. clean catalogs of uv sources (guvcat) were recently constructed (bianchi et al. 2017) with added flags to facilitate science applications including e.g., selec... | new constraints for stellar evolution from the galex ultraviolet source catalogs |
mass loss and variability are two linked, fundamental properties of evolved stars. in this paper, i review our current understanding of these processes, with a particular focus on how observations and models are used to constrain reliable mass loss prescriptions for stellar evolution and population synthesis models. | mass loss and variability in evolved stars |
observations of the rotation curves of large galaxies like the milky way have firmly established that there is a massive unseen halo influencing the dynamics of the luminous stellar population. dark matter searches, coupled with computational models of galaxy assembly and growth, have attempted to constrain the nature ... | lisa implications of white dwarf binaries in the milky way dark matter halo |
the planets forming in the accretion disk of young stars are yet unseen by the new generation of instruments whereas their study is crucial for understanding the evolution of inner planetary systems. analysis of stellar spectra provides good proxies for studying and detecting such planetary systems. however, disentangl... | non-lte atomic line formation in accretion disk around young stars |
binary neutron star mergers (nsms) have been confirmed as one source of the heaviest observable elements made by the rapid neutron-capture (r-) process. however, modeling nsm outflows'from the total ejecta masses to their elemental yields'depends on the unknown nuclear equation of state (eos) that governs neutron-star ... | a nuclear equation of state inferred from stellar r-process abundances |
we propose a major transformation of the evolutionary synthesis code starburst99 to meet the needs of the community in the coming decade. a new generation of stellar evolution models optimized for (but not limited to) massive stars has been developed. these models account for the latest progress in nuclear physics, con... | feasting on the riches of odysseus' voyage |
the aim of this study was to investigate the effects of progestins on the sex differentiation of zebrafish by measuring the sex ratio and transcriptions of genes related to sex differentiation (amh, dmrt1, figa, sox9a and sox9b genes) as well as sex hormone levels and transcriptional expression profiles along the hypot... | long-term exposure to environmentally relevant concentrations of progesterone and norgestrel affects sex differentiation in zebrafish (danio rerio) |
libraries of stellar spectra find a plethora of applications, from photometric calibration to stellar population synthesis. we present low resolution spectra obtained with stis (space telescope imaging spectrograph) of 40 stars spanning 0.2 to 1.0 micrometers in spectral coverage. the stars include normal o-type stars,... | spectral library of hot stars with hubble space telescope |
x-ray binary systems (xrbs) in the mw can exist in several different accretion states, and many have been found to vary along specific tracks on intensity-color diagrams. observationally measuring the distributions of these accretion states in a variety of environments can aid in population synthesis modeling and ultim... | measuring x-ray binary accretion state distributions in extragalactic environments using xmm-newton |
the thermally-pulsing asymptotic giant branch (tp-agb) phase is one of the most uncertain evolutionary phase of low- and intermediate-mass stars. the classical calibration based on magellanic clouds (mcs) clusters has proved to be unsuitable for other galaxies and the overall contribution of tp-agb stars to the integra... | calibrating the tp-agb phase through resolved stellar populations in the small magellanic cloud |
python bindings to charlie conroy's flexible stellar population synthesis (fsps) fortran code | dfm/python-fsps: python-fsps v0.4.5rc1 |
dust is a key component of the interstellar medium; however, the dominant channels of dust production throughout cosmic time are uncertain. in this talk, i will discuss our analysis revisiting the impact of dust formation in the colliding winds of carbon-rich wolf-rayet (wc) binaries. by conducting a dust sed analysis ... | revisiting the impact of dust production from wolf-rayet binaries |
the analysis is carried out using high-resolution (r=81000) and high signal-to-noise ratio (800<s/n/pixel<3400) spectrum, in the wavelength range 3700-10475, obtained with a seven-hour exposure time, using the espadons at the cfht. the calculations in lte were performed with the osmarcs 1d atmospheric model and t... | vizier online data catalog: abundance analysis of hd 140283 (siqueira-mello+, 2015) |
the formation and evolution of local brightest cluster galaxies (bcgs) is investigated by comparing the stellar populations and dynamics of the galaxy, the intracluster light (icl), and nearby companions. integral spectroscopic data of 23 local bcgs observed out to 4 re is collected. stellar population synthesis codes ... | clocking the formation of today's largest galaxies: intracluster light and nearby companions |
the lyman continuum (lyc = hydrogen-ionizing radiation at wavelengths < 912 ang) of galaxies plays a fundamental role in determining the physical and observational properties of the ism and igm, including cosmic reionization. yet it is basically inaccessible to direct observations, and one therefore heavily relies o... | uncovering the lyman continuum sed of star-forming galaxies from550 to 912 angstroem |
population synthesis models predict the existence of large numbers of wide binaries for which the end state is a wide double white dwarf (dwd) system. i discuss the methods i used to find these systems in the sloan digital sky survey, which ultimately increased the known number of candidate binaries from ~45 to 112. i ... | constraining the initial-final mass relation with wide double white dwarfs |
the origin of magnetic fields in isolated and binary white dwarfs has been investigated in a series of recent papers. one proposal is that magnetic fields are generated through an alpha-omega dynamo during common envelope evolution. here we present population synthesis calculations showing that this hypothesis is suppo... | the magnetic fields of white dwarfs in cataclysmic variables |
the thick disc is a major component of the milky way but, its characteristics and history are still not yet well constrained. the use of a population synthesis model, based on a scenario of formation and evolution of the galaxy, a star formation history, and a set of stellar evolution models, is a way to improve the co... | study of the structure and formation of the thick disc from stellar population modelling |
we present [fe/h] and [na/fe] abundances for 35 asymptotic giant branch (agb) stars in the galactic globular cluster 47 tucanae, using high resolution spectra obtained with the michigan/magellan fiber system (m2fs) spectrograph on the magellan-clay 6.5m telescope. the abundances and model atmosphere parameters were der... | comparing agb and rgb sodium abundances in the globular cluster 47 tucanae (ngc 104) |
the increased interest that sparks the search for exoplanets over the last few years has resulted in the design of high-resolution spectrographs such as carmenes, installed at the 3.5 m telescope in the calar alto observatory in almería (spain), in order to improve the radial-velocity measurements and, thus, to help de... | spectroscopy of fgkm-type stars for the scientific exploitation of the carmenes exoplanet search / espectroscopía de estrellas fgkm para la explotación científica de la búsqueda de exoplanetas con carmenes |
massive stars are powerful sources of ionizing radiation and kinetic energy that shape the interstellar medium and the uv spectral morphology of host galaxies. their life-averaged feedback and their end as sn/grb make them fundamental ingredients to galactic chemodynamical evolution models and population synthesis code... | the winds of massive stars at the peak of the star formation history of the universe |
type ia supernovae are good standardizable candles, but their reliability as distance indicators may be limited by the imprint of their galactic origins on supernova progenitors. to investigate the connection between supernovae and their host characteristics, we have developed an improved method to estimate the stellar... | the influence of environment age and host mass on type ia supernova light curves |
most of the physical processes driving the tp-agb evolution are not yet fully understood and they need to be modelled with parameterised descriptions. we present the results of the on-going calibration of the tp-agb phase based on a complete sample of agb stars in the small magellanic cloud (sage-smc survey). we comput... | calibrating tp-agb stellar models and chemical yields through resolved stellar populations in the small magellanic cloud |
employing the mesa stellar evolution code, we computed he accretion onto carbon-oxygen white dwarfs (co wds).we found two possible outcomes for models in which the wd steadily grows in mass towards the chandrasekhar limit. for relatively low he-accretion rates carbon ignition occurs in the center, leading to a type ia ... | the wd+he star binaries as the progenitors of type ia supernovae |
a broad effort is ongoing with large spectroscopic surveys such as apogee, eso-gaia, rave from which stellar parameters, radial velocities and detailed chemical abundances can be measured for corot, kepler, and k2 targets. in addition, asteroseismic data of red-giants stars observed by the space missions corot and kepl... | red-giant stars: chemical clocks in the milky way |
galactic evolution at high redshifts is largely understood through stellar population synthesis (sps) modeling of spectra and photometry integrated over all starlight of a galaxy. however, complex and poorly understood stellar phases like the unstable thermally-pulsating asymptotic giant branch (tp-agb) phase make sps ... | discriminating among stellar population synthesis models of the tp-agb phase in early quiescent galaxies |
gravitational microlensing provides a unique opportunity to probe the mass distribution of stars, black holes, and other objects in our milky way. however, population simulations are needed to interpret results from photometric microlensing surveys. the contribution from binary objects is often minimized or neglected i... | assessing the impact of binary systems on microlensing: adding binary systems to spisea and popsycle |
the present paper is devoted to the analysis of the evolution of young neutron stars (nss) in the milky way up to the death line. the methods of population synthesis have been used to study the distribution of an ensemble of young nss by their periods, period derivatives, and magnetic fields. the distribution of the in... | evolution of neutron stars in the milky way |
we consider modern insights into formation and evolution of symbiotic stars. the parameters of observed population of them are compared to results of population synthesis models. we discuss the problem of reconciliation of observed number of symbiotic stars and model predictions. | symbiotic stars: formation, evolution, population |
utilizing data from the mapping nearby galaxies at apo (manga) survey (manga product launch-4, or mpl-4), of the latest generation of the sloan digital sky survey (sdss-iv), we identified nine post-starburst (e+a) systems that lie within the green valley transition zone. we identify the e+a galaxies by their sdss singl... | spectral analysis, synthesis, & energy distributions of nearby e+a galaxies using sdss-iv manga |
the spatially resolved stellar population content of today's galaxies holds important information for understanding the diferent processes that contribute to the star formation and mass assembly histories of galaxies. in this talk we present the results from the analysis of more than 400 nearby galaxies from the califa... | spatially-resolved star formation history of califa galaxies: implications for galaxy formation |
we investigate here the effect of the selection function on the metallicity distribution function (mdf) as well as on the vertical metallicity gradient by studying similar lines-of-sight using four different spectroscopic surveys (apogee, lamost, rave and gaia-eso) which have different targeting strategies and therefor... | the effects of the selection function on metallicity trends in spectroscopic surveys of the milky way |
relying on the complementarity of gaia proper motions with radial velocities of the rave survey, we attempt to constrain the kinematics of the milky way disc. based on the population synthesis model, we simulate the observations, applying the detailed selection functions of the observations. the dynamics is described u... | kinematics of the milky way disc from the rave survey combined with gaia dr1 |
a string of recent studies have debated the exact form and physical origin of an evolutionary trend between the peak luminosity attained by type ia supernovae (sne ia) and the properties of the galaxies that host them. we shed new light on the discussion by presenting (i) an improved statistical method to analyze the s... | on the relationship between type ia supernova peak luminosity and host-galaxy properties |
jellyfish are the most extreme cases of galaxies undergoing ram-pressure stripping. in order to analyse the stellar populations distribution along these galaxies, we have performed stellar population synthesis in data cubes of jellyfish from the gasp programme, using both starlight and fado codes. | stellar population synthesis of jellyfish galaxies |
we present a new approach to comparing models of galaxy formation with deep images taken with the hubble space telescope (hst). in particular, we generate simulated hst images by projecting the galaxy formation models all the way into observational domain, adding cosmological and instrumental effects, and we analyze th... | understanding galaxy formation from deep hubble images: the forward-modeling approach |
2d ultrasonic arrays have considerable application potential in lamb wave based shm systems, since they enable equivocal damage imaging and even in some cases wave-mode selection. recently, it has been shown that the 2d arrays can be used in shm applications in a synthetic focusing (sf) mode, which is much more effecti... | designing of sparse 2d arrays for lamb wave imaging using coarray concept |
fossil groups are considered the end product of natural galaxy group evolution in which group members sink towards the centre of the gravitational potential due to dynamical friction, merging into a single, massive, and x-ray bright elliptical. since gravitational lensing depends on the mass of a foreground object, its... | the lens sw05 j143454.4+522850: a fossil group at redshift 0.6? |
the stellar initial mass function (imf) is a fundamental property in the measurements of stellar masses and galaxy star formation histories. i will present the stellar imf in the center of nearby massive galaxies in the massive survey based on high quality magellan/ldss-3 long-slit spectroscopy and detailed stellar syn... | the stellar initial mass function in the center of massive early-type galaxies |
stellar populations synthesis models have proven to be excellent tools to learn about galaxy evolution. however, modeling small stellar populations (lower than 105 m⊙) has been an intriguing and continuous to be a field of intensive research. in this work, we have developed a new approach to form stars from clusters fi... | modeling small stellar populations using starburst99 |
galaxy clusters provide a laboratory for studying the evolution of galaxies in dense environments. star formation in cluster galaxies seems to be suppressed relative to field galaxies. recent studies suggest that star formation continues in some cluster galaxies, but in a mode where a larger fraction of the light from ... | evolution of star formation rates in clusters using spitzer mips imaging |
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