A5000818857- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Phase Equilibria and Thermodynamics
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Bone health and treatments
- Radiopharmaceutical Chemistry and Applications
- Photocathodes and Microchannel Plates
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Superconducting and THz Device Technology
- Scientific Measurement and Uncertainty Evaluation
- Space Exploration and Technology
- Pharmaceutical Practices and Patient Outcomes
Laboratoire d’Astrophysique de Marseille
2014-2024
Centre National de la Recherche Scientifique
2015-2024
Aix-Marseille Université
2015-2024
Château Gombert
2011-2024
Centre Hospitalier Universitaire de Rennes
2020
Universidad Complutense de Madrid
2013-2020
Osservatorio astronomico di Bologna
2014-2015
National Institute for Astrophysics
2014
Galaxies, Etoiles, Physique et Instrumentation
2012
Carnegie Observatories
2003-2007
We present images, integrated photometry, and surface-brightness color profiles for a total of 1034 nearby galaxies recently observed by the Galaxy Evolution Explorer (GALEX) satellite in its far-ultraviolet (FUV; λeff = 1516 Å) near-ultraviolet (NUV; 2267 bands. Our catalog objects is derived primarily from GALEX Nearby Galaxies Survey (NGS) supplemented larger than 1' diameter serendipitously found these fields other exposures similar greater depth. The sample analyzed here adequately...
We estimate the galaxy stellar mass function and density for star-forming quiescent galaxies with 0.2<z<4. construct a deep K<24 sample of 220000 selected using UltraVISTA DR1 data release. Our analysis is based on precise 30-band photometric redshifts. By comparing these redshifts 10800 spectroscopic from zCOSMOS bright faint surveys, we find precision sigma(dz/(1+z))=0.008 at i<22.5 sigma(dz/(1+zs))=0.03 1.5<z<4. derive correct Eddington bias. mass-dependent evolution global populations....
ABSTRACT The Next Generation Virgo Cluster Survey (NGVS) is a program that uses the 1 deg 2 MegaCam instrument on Canada–France–Hawaii Telescope to carry out comprehensive optical imaging survey of cluster, from its core virial radius—covering total area 104 —in u * griz bandpasses. Thanks dedicated data acquisition strategy and processing pipeline, NGVS reaches point-source depth g ≈ 25.9 mag (10σ) surface brightness limit μ ∼ 29 arcsec −2 (2σ above mean sky level), thus superseding all...
(Abridged) Far ultraviolet to far infrared images of the nearby galaxy NGC5194, from Spitzer, GALEX, Hubble Space Telescope and ground--based data, are used investigate local global star formation, impact dust extinction in HII-emitting knots. In IR/UV-UV color plane, NGC5194 HII knots show same trend observed for normal star-forming galaxies, having a much larger dispersion than starburst galaxies. We identify as due UV emission predominantly tracing evolved, non-ionizing stellar...
Abstract The Laser Interferometer Space Antenna (LISA) will be a transformative experiment for gravitational wave astronomy, and, as such, it offer unique opportunities to address many key astrophysical questions in completely novel way. synergy with ground-based and space-born instruments the electromagnetic domain, by enabling multi-messenger observations, add further discovery potential of LISA. next decade is crucial prepare community LISA’s first observations. This review outlines...
The ultraviolet-to-radio continuum spectral energy distributions are presented for all 75 galaxies in the Spitzer Infrared Nearby Galaxies Survey (SINGS). A principal component analysis of sample shows that most sample's variations stem from two underlying components, one representative a galaxy with low infrared-to-ultraviolet ratio and high ratio. influence several parameters on is studied (e.g., optical morphology, disk inclination, far-infrared color, ultraviolet slope, star formation...
We have initiated a search for extended ultraviolet disk (XUV-disk) galaxies in the local universe. Here we compare GALEX UV and visible-NIR images of 189 nearby (D < 40 Mpc) S0-Sm included Atlas Nearby Galaxies present first catalog XUV-disk galaxies. find that are surprisingly common but varied relative (UV/optical) extent morphology. Type 1 objects (≳20% incidence) structured, UV-bright/optically faint emission features outer disk, beyond traditional star formation threshold. 2 (~10%...
We compare the dust attenuation properties of two samples galaxies purely selected in Galaxy Evolution Explorer (GALEX) near-ultraviolet band (NUV; 1750-2750 Å, λmean = 2310 Å) and far-infrared (FIR) at 60 μm. These are built using GALEX IRAS sky surveys over ~600 deg2. The NUV-selected sample contains 95 detected down to NUV 16 mag (AB system). Eighty-three this spiral or irregular, only them not FIR-selected is from PSCz survey, which complete 0.6 Jy. Among 163 sources, we select 118...
The chemical and spectrophotometric evolution of spiral galaxies is investigated with detailed models, making use up-to-date ingredients (like metallicity-dependent stellar properties) a prescription for the star formation rate (SFR) justified both empirically theoretically. As first application, model used to describe Milky Way. role adopted scheme disc (‘inside-out’) in shaping various colour profiles investigated, as well extinction. It shown that Solar neighbourhood does not evolve like...
Ultraviolet imaging with the Galaxy Evolution Explorer (GALEX) has revealed an extensive sample of UV-bright stellar complexes in extreme outer disk M83, extending to about 4 times radius at which majority H II regions are detected (R = 51, or 6.6 kpc). These sources typically associated large-scale filamentary I structures warped M83 and distributed beyond galactocentric radii molecular interstellar medium yet been detected. We present measured properties these complexes, including far-UV...
We present a detailed analysis of the radial distribution dust properties in SINGS sample, performed on set UV, IR and HI surface brightness profiles, combined with published molecular gas profiles metallicity gradients. The internal extinction, derived from TIR-to-FUV luminosity ratio, decreases radius, is larger Sb-Sbc galaxies. ratio correlates UV spectral slope beta, following sequence shifted to redder colors respect that starbursts. star formation history (SFH) identified as main...
We reassess the applicability of Toomre criterion in galactic discs and we study local star formation law 16 disc galaxies for which abundance gradients are published. The data use consist stellar light profiles, atomic molecular gas (deduced from CO with a metallicity-dependent conversion factor), rates (from Hα emissivities), metallicities, dispersion velocities rotation curves. show that applies successfully to case Milky Way disc, but it has limited success our sample; depending on...
We use a volume-, magnitude-limited sample of nearby galaxies to investigate the effect environment on H i scaling relations. confirm that i-to-stellar mass ratio anticorrelates with stellar mass, surface density and NUV −r colour across whole range parameters covered by our (109≲M*≲ 1011 M⊙, 7.5 ≲μ*≲ 9.5 M⊙ kpc−2, 2 ≲ −r≲ 6 mag). These relations are also followed in Virgo cluster, although they significantly offset towards lower gas content. Interestingly, difference between field cluster...
We study the evolution of dwarf (L_H < 10^{9.6} L_Ho) star forming and quiescent galaxies in Virgo cluster by comparing their UV to radio centimetric properties predictions multizone chemo-spectrophotometric models galaxy especially tuned take into account perturbations induced interaction with intergalactic medium. Our simulate one or multiple ram pressure stripping events starvation. Models predict that all entering for first time loose most, if not all, atomic gas content, quenching on...
We present specific Star Formation Rate (sSFR) radial profiles for a sample of 161 relatively face-on spiral galaxies from the GALEX Atlas Nearby Galaxies. The sSFR are derived & 2MASS (FUV-K) color after proper SFR calibration UV luminosity and K-band mass-to-light ratio adopted. were first corrected foreground Galactic extinction later internal using total-infrared (TIR) to FUV emission. For those objects where TIR-to-FUV-ratio not available, (FUV-NUV) as measure slope. gradients these...
For a sample of 43 nearby, late-type galaxies, we have investigated the radial variation both current star formation rate and dust-induced UV light attenuation. To do this cross-correlated IRAS images GALEX observations for each these galaxies compiled gas (CO H I) metal-abundance gradients found in literature. We find that attenuation correlates with metallicity. then use profiles, corrected attenuation, to study several variants Schmidt law conclude our results are compatible simple...
We use Hα and far-ultraviolet (FUV, 1539 Å) Galaxy Evolution Explorer (GALEX) data for a large sample of nearby objects to study the high-mass (m⩾ 2 M☉) star formation activity normal late-type galaxies. The are corrected dust attenuation using most accurate techniques available at present, namely Balmer decrement total far-infrared FUV flux ratio GALEX data. shows highly dispersed distribution in (log f(Hα)/f(FUV) = 1.10 ± 0.34 indicating that two commonly used tracers give rates (SFRs)...
We study the properties of cold gas component interstellar medium Herschel Reference Survey, a complete volume-limited (15 10^10 Mo) from COLD GASS survey down to stellar masses M* ~ 10^9 Mo. As scaling variables we use M*, surface density mu*, specific star formation rate SSFR, and metallicity target galaxies. By comparing molecular determined using constant or luminosity dependent conversion factor, estimate robustness these relations on very uncertain assumptions used transform CO line...
We investigate the dependence of total-IR (TIR) to ultraviolet (UV) luminosity ratio method for calculating UV dust attenuation A(UV) from age underlying stellar populations by using a library spectral energy distributions galaxies with different star formation histories. Our analysis confirms that TIR/UV versus relation varies significantly population: is, same ratio, systems low specific rate (SSFR) suffer lower than starbursts. Using sample nearby field and cluster spiral galaxies, we...
The HRS is a complete volume-limited sample of nearby objects including Virgo cluster and isolated objects. Using recent compilation HI CO data we study the effects on molecular gas content spiral galaxies. We first identify M* as scaling variable that traces total H2 mass galaxies better. show that, average, HI-deficient are significantly offset from M(H2) vs. relation for HI-normal use to define H2-deficiency parameter. This parameter shows weak scattered with HI-def, here taken proxy...
We present ultraviolet through far-infrared surface brightness profiles for the 75 galaxies in Spitzer Infrared Nearby Galaxies Survey (SINGS).The imagery used to measure includes GALEX UV data, optical images from KPNO, CTIO and SDSS, near-IR data 2MASS, mid-and farinfrared Spitzer.Along with radial profiles, we also provide multi-wavelength asymptotic magnitudes several non-parametric indicators of galaxy morphology: concentration index (C 42 ), asymmetry (A), Gini coefficient (G)...
We present GALEX far-ultraviolet (FUV) and near-ultraviolet (NUV) as well SDSS g, r, i photometry structural parameters for the Herschel Reference Survey, a magnitude-, volume-limited sample of nearby galaxies in different environments. use this unique dataset to investigate ultraviolet (UV) scaling relations determine how properties UV disk vary with atomic hydrogen content environment. find clear change slope stellar mass vs. effective surface brightness relation when moving from optical...