A5053667167- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Spectroscopy and Laser Applications
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Photocathodes and Microchannel Plates
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- History and Developments in Astronomy
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Advanced Fluorescence Microscopy Techniques
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Advanced Statistical Methods and Models
Sorbonne Université
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Institut d'Astrophysique de Paris
2016-2025
Space Telescope Science Institute
2022
Laboratoire des Technologies de la Microélectronique
2017
UK Astronomy Technology Centre
2014
Aix-Marseille Université
2014
Max Planck Institute for Astrophysics
2000-2011
Université Sorbonne Nouvelle
2010
European Southern Observatory
2009
We examine the properties of host galaxies 22,623 narrow-line AGN with 0.02
Abstract We present a comprehensive study of the physical properties ∼ 105 galaxies with measurable star formation in Sloan Digital Sky Survey (SDSS). By comparing information extracted from emission lines continuum properties, we build up picture nature star-forming at z < 0.2. develop method for aperture correction using resolved imaging and show that our takes out essentially all bias rate (SFR) estimates, allowing an accurate estimate total SFRs galaxies. determine SFR density to...
We develop a new method to constrain the star formation histories, dust attenuation and stellar masses of galaxies. It is based on two absorption-line indices, 4000-Å break strength Balmer index HδA. Together, these indices allow us mean ages galaxies fractional mass formed in bursts over past few Gyr. A comparison with broad-band photometry then yields estimates mass. generate large library Monte Carlo realizations different including starbursts varying range metallicities. use this median...
view Abstract Citations (1953) References (74) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectral Evolution of Stellar Populations Using Isochrone Synthesis Bruzual A., Gustavo ; Charlot, Stephane We combine the photometric model isochrone synthesis recently published by Chariot and (1991) with an updated library stellar spectra to predict spectral evolution populations solar metallicity. The assembled here supersedes other existing libraries its range,...
We present a new model for computing the effects of dust on integrated spectral properties galaxies, based an idealized description main features interstellar medium (ISM). The includes ionization H II regions in interiors dense clouds which stars form and influence finite lifetime these absorption radiation. compute production emission lines continuum radiation subsequent transfer line surrounding I ambient ISM. This enables us to interpret simultaneously all observations...
We present photometric redshifts for an uniquely large and deep sample of 522286 objects with i'_{AB}<25 in the Canada-France Legacy Survey ``Deep Survey'' fields, which cover a total effective area 3.2 deg^2. use 3241 spectroscopic 0<z<5 from VIMOS VLT Deep as calibration to derive these redshifts. devise robust method removes systematic trends significantly reduces fraction catastrophic errors. our unique detailed assessment robustness redshift sample. For selected at i'_{AB}<24, we reach...
We study the relations between stellar mass, star formation history, size and internal structure for a complete sample of 122 808 galaxies drawn from Sloan Digital Sky Survey. show that low-redshift divide into two distinct families at mass 3 × 1010 M⊙. Lower-mass have young populations, low surface densities concentrations typical discs. Their histories are more strongly correlated with density than mass. A significant fraction lowest-mass in our experienced recent starbursts. At given...
We present the deepest 100 to 500 μm far-infrared observations obtained with Herschel Space Observatory as part of GOODS-Herschel key program, and examine infrared (IR) 3–500 spectral energy distributions (SEDs) galaxies at 0 < z 2.5, supplemented by a local reference sample from IRAS, ISO, Spitzer, AKARI data. determine projected star formation densities their radio mid-IR continuum sizes.
We use a complete sample of galaxies drawn from the Sloan Digital Sky Survey to study how structure, star formation and nuclear activity depend on local density stellar mass. Local is estimated by counting above fixed absolute magnitude limit within cylinders 2 Mpc in projected radius ±500 km s−1 depth. The mass distribution shifts almost factor two towards higher masses between low- high-density regions. At both strongly density, while structural parameters such as size concentration are...
We investigate the accretion-driven growth of supermassive black holes in low-redshift universe using 23,000 narrow-emission-line ("type 2") active galactic nuclei (AGNs) and complete sample 123,000 galaxies Sloan Digital Sky Survey from which they were drawn. use stellar velocity dispersions early-type AGN hosts to estimate their hole masses, we [O III] λ5007 emission line luminosities accretion rates. find that most present-day occurs onto with masses less than 108 M☉ reside moderately...
We derive stellar metallicities, light-weighted ages and masses for a magnitude-limited sample of 175 128 galaxies drawn from the Sloan Digital Sky Survey Data Release Two (SDSS DR2). compute median-likelihood estimates these parameters using large library model spectra at medium–high resolution, covering comprehensive range star formation histories. The constraints we are set by simultaneous fit five spectral absorption features, which well reproduced our population synthesis models. By...
The properties of the host galaxies a well-defined sample 2215 radio-loud active galactic nuclei (AGN) with redshifts 0.03 < z 0.3, defined from Sloan Digital Sky Survey (SDSS), are investigated. These predominantly low radio-luminosity sources, 1.4-GHz luminosities in range 1023–1025 W Hz−1. fraction that AGN L1.4 GHz > 1023W Hz−1 is strong function stellar mass, rising nearly zero below mass 1010M⊙ to more than 30 per cent at masses 5 × 1011M⊙. In contrast integrated [Oiii] luminosity...
Understanding cosmic reionization requires the identification and characterization of early sources hydrogen-ionizing photons. The 2012 Hubble Ultra Deep Field (UDF12) campaign has acquired deepest infrared images with Wide Camera 3 aboard Space Telescope and, for first time, systematically explored galaxy population deep into era when microwave background (CMB) data indicates was underway. UDF12 thus provides best constraints to date on abundance, luminosity distribution, spectral...
We present the results of deepest search to date for star-forming galaxies beyond a redshift z~8.5 utilizing new sequence near-infrared Wide Field Camera 3 images Hubble Ultra Deep Field. This `UDF12' campaign completed in September 2012 doubles earlier exposures with WFC3/IR this field and quadruples exposure key F105W filter used locate such distant galaxies. Combined additional imaging F140W filter, fidelity high candidates is greatly improved. Using spectral energy distribution fitting...
We present a new model for computing consistently the line and continuum emission from galaxies, based on combination of recent population synthesis photoionization codes. use effective parameters to describe H ii regions diffuse gas ionized by single stellar generations in galaxy, among which most important ones are zero-age ionization parameter, metallicity dust-to-heavy element ratio. calibrate nebular properties our using observed [O iii]/Hβ, ii]/[O iii], [S ii]/Hα [N ii]/[S ii] ratios...
The Herschel ATLAS is the largest open-time key project that will be carried out on Space Observatory. It survey 510 square degrees of extragalactic sky, four times larger than all other surveys combined, in five far-infrared and submillimetre bands. We describe survey, complementary multi-wavelength datasets combined with data, six major science programmes we are undertaking. Using new models based a previous galaxies, present predictions properties sources wavebands.
We provide an overview of the design and capabilities near-infrared spectrograph (NIRSpec) onboard James Webb Space Telescope. NIRSpec is designed to be capable carrying out low-resolution ($R\!=30\!-330$) prism spectroscopy over wavelength range $0.6-5.3\!~\mu$m higher resolution ($R\!=500\!-1340$ or $R\!=1320\!-3600$) grating $0.7-5.2\!~\mu$m, both in single-object mode employing any one five fixed slits, a 3.1$\times$3.2 arcsec$^2$ integral field unit, multiobject novel programmable...
We present a new determination of the ultraviolet (UV) galaxy luminosity function (LF) at redshift z ≃ 7 and 8, first estimate 9. An accurate form evolution LF during this era is key importance for improving our knowledge earliest phases process cosmic reionization. Our analysis exploits to full new, deepest Wide Field Camera 3/infrared imaging from Hubble Space Telescope (HST) Ultra-Deep 2012 (UDF12) campaign, with dynamic range provided by including consistent all appropriate,...
We present the results of first, deep Atacama Large Millimeter Array (ALMA) imaging covering full ≃4.5 arcmin2 Hubble Ultra Deep Field (HUDF) imaged with Wide Camera 3/IR on HST. Using a 45-pointing mosaic, we have obtained homogeneous 1.3-mm image reaching σ1.3 ≃ 35 μJy, at resolution ≃0.7 arcsec. From an initial list ≃50 > 3.5σ peaks, rigorous analysis confirms 16 sources S1.3 120 μJy. All these secure galaxy counterparts robust redshifts (〈z〉 = 2.15). Due to unparalleled supporting data,...
We exploit recent constraints on the ages and metallicities of early-type galaxies in Sloan Digital Sky Survey (SDSS) to gain new insight into physical origin two fundamental relations obeyed by these galaxies: colour–magnitude Mg2–σV relations. Our sample consists 26 003 selected from SDSS Data Release 2 (DR2) basis their concentrated light profiles, for which we have previously derived median-likelihood estimates stellar metallicity, light-weighted age mass. analysis provides most...
We discuss new Keck/MOSFIRE spectroscopic observations of four luminous galaxies at z ≃ 7–9 selected to have intense optical line emission by Roberts-Borsani et al. Previous follow-up has revealed Lyα in two the galaxies. Our MOSFIRE confirm that is present entire sample. detect galaxy COS-zs7-1, confirming its redshift as zLyα = 7.154, and we EGS-zs8-2 7.477, verifying an earlier tentative detection. The ubiquity this sample puzzling given IGM expected be significantly neutral over 7 < 9....
In this paper, we present GALEX-SDSS-WISE Legacy Catalog (GSWLC), a catalog of physical properties (stellar masses, dust attenuations and star formation rates (SFRs)) ~700,000 galaxies with SDSS redshifts below 0.3. GSWLC contains within the GALEX footprint, regardless UV detection, covering 90% SDSS. The were obtained from UV/optical SED fitting following Bayesian methodology Salim et al. (2007), improvements such as blending corrections for low-resolution photometry, flexible attenuation...
We present a new-generation tool to model and interpret spectral energy distributions (SEDs) of galaxies, which incorporates in consistent way the production radiation its transfer through interstellar intergalactic media. This flexible tool, named BEAGLE (for BayEsian Analysis GaLaxy sEds), allows one build mock galaxy catalogues as well any combination photometric spectroscopic observations terms physical parameters. The current version includes versatile modeling emission from stars...