A5056216981- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Superconducting and THz Device Technology
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Spectroscopy and Laser Applications
- CCD and CMOS Imaging Sensors
- History and Developments in Astronomy
- Atmospheric Ozone and Climate
- Advanced Statistical Methods and Models
- Computational Physics and Python Applications
- Astro and Planetary Science
- Phase Equilibria and Thermodynamics
- Pulsars and Gravitational Waves Research
- Distributed and Parallel Computing Systems
- Soil Moisture and Remote Sensing
Centre National de la Recherche Scientifique
2016-2025
Aix-Marseille Université
2013-2025
Laboratoire d’Astrophysique de Marseille
2012-2024
Château Gombert
2010-2024
Astrophysique, Instrumentation et Modélisation
2015-2021
Université Paris-Saclay
2018-2021
Université Paris Cité
2015-2020
CEA Paris-Saclay
2015-2020
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2020
Délégation Paris 7
2016-2020
We report the discovery of a candidate galaxy with photo-z z~12 in first epoch JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify source robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) m_F200W=27.3, and >7-sigma detections five filters. The is not detected at lambda < 1.4um deep imaging from both HST JWST, has faint ~3-sigma F150W F160W, which signal Ly-alpha break near red edge filters, implying z~12. This object (Maisie's...
Context. Measuring how the physical properties of galaxies change across cosmic times is essential to understand galaxy formation and evolution. With advent numerous ground-based space-borne instruments launched over past few decades we now have exquisite multi-wavelength observations from FUV radio domain. To tap into this mine data obtain new insight evolution galaxies, it that are able extract information their SED. Aims. We present a completely implementation CIGALE. Written in python,...
The Dwarf Galaxy Survey (DGS) program is studying low-metallicity galaxies using 230h of far-infrared (FIR) and submillimetre (submm) photometric spectroscopic observations the Herschel Space Observatory draws to this a rich database wide range wavelengths tracing dust, gas stars. This sample 50 includes largest metallicity achievable in local Universe including lowest (Z) galaxies, 1/50 Zsun, spans 4 orders magnitude star formation rates. survey designed get handle on physics interstellar...
We present a new, publicly available library of dust spectral energy distributions (SEDs). These SEDs are characterized by only three parameters: the mass (Mdust), temperature (Tdust), and mid-to-total infrared color (IR8=LIR/L8). The latter measures relative contribution PAH molecules to LIR. used this model star-forming galaxies at 0.5<z<4 in CANDELS fields, using both individual detections stacks Herschel ALMA imaging, extending sample z=0 Reference Survey. At first order, SED galaxy was...
ABSTRACT Code Investigating GALaxy Emission (cigale) is a powerful multiwavelength spectral energy distribution (SED) fitting code for extragalactic studies. However, the current version of cigale not able to fit X-ray data, which often provide unique insights into active galactic nucleus (AGN) intrinsic power. We develop new module cigale, allowing it SEDs from infrared (IR). also improve AGN UV-to-IR wavelengths. implement modern clumpy two-phase torus model, skirtor. To account moderately...
We present a 69 arcmin$^2$ ALMA survey at 1.1mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band part of GOODS-South field. taper 0"24 original image with homogeneous and circular synthesized beam 0"60 to reduce number independent beams - thus reducing purely statistical spurious detections optimize sensitivity point sources. extract catalogue galaxies selected by identify sources without HST counterparts down 5$\sigma$ limiting depth H=28.2 AB (HST/WFC3 F160W). detects 20 brighter than 0.7...
Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources expected drop out bluer filters while well detected redder filters. However, here we show that dust-enshrouded star-forming galaxies lower redshifts (z<7) may also mimic near-infrared (near-IR) colors LBGs, representing potential contaminants LBG candidate samples. First, analyze...
We present rest-frame optical emission-line flux ratio measurements for five $z>5$ galaxies observed by the JWST Near-Infared Spectrograph (NIRSpec) in SMACS 0723 Early Release Observations. add several quality-control and post-processing steps to NIRSpec pipeline reduction products order ensure reliable relative calibration of emission lines that are closely separated wavelength, despite uncertain \textit{absolute} spectrophotometry current version reductions. Compared $z\sim3$ literature,...
Star formation histories (SFHs) of early galaxies (6 < z 12) have been found to be highly stochastic in both simulations and observations, while at ≲6 the presence a main sequence (MS) star-forming implies secular processes play. In this work we characterise SFH variability as function their stellar mass redshift. We used JADES public catalogue derived physical properties well SFHs using spectral energy distribution modelling code CIGALE . To end, implemented non-parametric with flat...
Abstract We present the star formation rate–stellar mass (SFR– M * ) relation for galaxies in Cosmic Evolution Early Release Science survey at 4.5 ≤ z 12. model JWST and Hubble Space Telescope rest-UV rest-optical photometry of with flexible histories (SFHs) using BAGPIPES. consider SFRs averaged from SFHs over 10 Myr (SFR 100 ), where probes on these timescales, effectively tracing nebular emission lines (on ~10 timescales) UV/optical continuum ~100 timescales). measure slope, normalization...
We combine new Herschel/SPIRE sub-millimeter observations with existing multiwavelength data to investigate the dust scaling relations of Herschel Reference Survey, a magnitude-, volume-limited sample ~300 nearby galaxies in different environments. show that dust-to-stellar mass ratio anti-correlates stellar mass, surface density and NUV-r colour across whole range parameters covered by our sample. Moreover, decreases significantly when moving from late- early-type galaxies. These are...
We present Herschel observations of 62 early-type galaxies (ETGs), including 39 morphologically classified as S0+S0a and 23 ellipticals using SPIRE at 250, 350, 500 μm part the volume-limited Reference Survey (HRS). detect dust emission in 24% 62% S0s. The mean temperature is 〈Td〉 = 23.9 ± 0.8 K, warmer than that found for late-type Virgo Cluster. mass entire detected sample logMd 6.1 0.1 M☉ with a dust-to-stellar-mass ratio log(Md/M*) −4.3 0.1. Including non-detections, these parameters are...
We gather infrared (IR) photometric data from 8 to 500 microns (Spitzer, WISE, IRAS and Herschel) for all of the HRS galaxies. Draine & Li (2007) models are fit which stellar contribution has been carefully removed. find that our coverage is sufficient constrain parameters a strong constraint on 20-60 range mandatory estimate relative photo-dissociation regions IR SED. The SED tend systematically under-estimate observed flux densities, especially low mass systems. provide output galaxies:...
We use high-resolution continuum images obtained at 870microns with the Atacama Large Millimeter Array (ALMA) to probe surface density of star-formation in z~2 galaxies and study different physical properties between within above main sequence galaxies. This sample eight star-forming selected among most massive Herschel GOODS-South field is supplemented eleven from public data 1.3 mm survey Hubble Ultra-Deep Field. ALMA reveals systematically dense concentrations dusty close center stellar...
We use Herschel Space Observatory data to place observational constraints on the peak and Rayleigh-Jeans slope of dust emission observed at 70-500 microns in nearby spiral galaxy M81. find that ratios wave bands between 160 500 are primarily dependent radius but ratio 70 micron shows no clear dependence surface brightness or radius. These results along with analyses spectral energy distributions imply 160-500 traces 15-30 K heated by evolved stars bulge disc whereas includes active galactic...
We present new photometric data from our Herschel Key Programme, the Dwarf Galaxy Survey (DGS), dedicated to observation of gas and dust in 48 low-metallicity environments. They were observed with PACS SPIRE onboard at 70,100,160,250,350, 500 microns. focus on a systematic comparison derived FIR properties (FIR luminosity, mass, temperature emissivity index) more metal-rich galaxies investigate detection potential submm excess. The reduction method is adapted for each galaxy derive most...
UV and optical surveys are essential to gain insight into the processes driving galaxy formation evolution. The rest-frame emission is key measure cosmic SFR. However, light strongly reddened by dust. In starburst galaxies, colour attenuation linked, allowing correct for dust extinction. Unfortunately, evidence has been accumulating that relation between different normal star-forming galaxies when compared galaxies. It still not understood why deviate from colour-attenuation of Previous work...
The Herschel Reference Survey (HRS) is a guaranteed time key project aimed at studying the physical properties of interstellar medium in galaxies nearby universe. This volume limited, K-band selected sample composed spanning whole range morphological types (from ellipticals to late-type spirals) and environments field centre Virgo Cluster). We present flux density measurements 323 HRS three bands Spectral Photometric Imaging Receiver (SPIRE), 250, 350 500 microns. Aperture photometry...
Aims. We present the first public release of photometric redshifts, galaxy rest frame properties and associated magnification values in cluster parallel pointings two Frontier Fields, Abell-2744 MACS-J0416. The released catalogues aim to provide a reference for future investigations extragalactic populations these legacy fields: from lensed high-redshift galaxies members themselves.
We present Herschel/PACS 100 and 160 µm integrated photometry for the 323 galaxies in Herschel Reference Survey (HRS), a K-band, volume-limited sample of local Universe.Once combined with Herschel/SPIRE observations already available, these data make HRS largest representative nearby homogeneous coverage across 100-500 wavelength range.In this paper, we take advantage unique set to investigate properties shape far-infrared/submillimetre spectral energy distribution galaxies.We show that,...
ABSTRACT We report the discovery of a remarkable concentration massive galaxies with extended X-ray emission at z spec = 2.506, which contains 11 ( M * ≳ 10 ⊙ ) in central 80 kpc region (11.6 σ overdensity). have spectroscopically confirmed 17 member from CO and remaining ones H α . The luminosity, stellar mass content, velocity dispersion all point to collapsed, cluster-sized dark matter halo 200 c 13.9±0.2 , making it most distant X-ray-detected cluster known date. Unlike other clusters...
We study the star formation quenching mechanism in cluster galaxies by fitting SED of Herschel Reference Survey, a complete volume-limited K-band-selected sample nearby including objects different density regions, from core Virgo to general field. The are fitted using CIGALE modelling code. truncated activity is parametrised specific SFH with 2 free parameters, age QA and factor QF. These parameters crucial for identification which acts on long timescales if starvation while rapid efficient...
We derive the SFH of MS galaxies showing how peak a galaxy depends on its seed mass at e.g. z=5. Following MS, undergo drastic slow down their stellar growth after reaching SFH. According to abundance matching, these masses correspond hot and massive DM halos which state could results in less efficient gas inflows thus be origin limited growth. As result, can enter passive region UVJ diagram while still forming stars. The ability classical analytical SFHs retrieve SFR from SED fitting is...
Context. The Frontier Fields survey is a pioneering observational program aimed at collecting photometric data, both from space (Hubble Space Telescope and Spitzer Telescope) ground-based facilities (VLT Hawk-I), for six deep fields pointing clusters of galaxies nearby parallel fields, in wide range passbands. analysis these data natural outcome the Astrodeep project, an EU collaboration developing methods tools extragalactic photometry creating valuable public catalogues.
We have fit the far-ultraviolet (FUV) to sub-millimeter (850 micron) spectral energy distributions (SEDs) of 61 galaxies from "Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel" (KINGFISH). The fitting has been performed using three models: Code for Investigating GALaxy Evolution (CIGALE), GRAphite-SILicate approach (GRASIL), and Multi-wavelength Analysis Galaxy PHYSical properties (MAGPHYS). analyzed results codes in terms SED shapes, by comparing derived quantities...