M. Sauvage
A5073579416- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Superconducting and THz Device Technology
- Spacecraft Design and Technology
- Planetary Science and Exploration
- CCD and CMOS Imaging Sensors
- Molecular Spectroscopy and Structure
- History and Developments in Astronomy
- Space Exploration and Technology
- Radio Astronomy Observations and Technology
- Spacecraft and Cryogenic Technologies
- High-pressure geophysics and materials
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
Université Paris Cité
2014-2025
Astrophysique, Instrumentation et Modélisation
2014-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2025
Centre National de la Recherche Scientifique
2013-2025
CEA Paris-Saclay
2012-2025
Université Paris-Saclay
2019-2025
Délégation Paris 7
2010-2025
Direction de la Recherche Technologique
2024
CEA Paris-Saclay - Etablissement de Saclay
1998-2024
Goddard Space Flight Center
2024
The Photodetector Array Camera and Spectrometer (PACS) is one of the three science instruments on ESA's far infrared submillimetre observatory. It employs two Ge:Ga photoconductor arrays (stressed unstressed) with 16x25 pixels, each, filled silicon bolometer 16x32 32x64 respectively, to perform integral-field spectroscopy imaging photometry in 60-210μ m wavelength regime. In mode, it simultaneously images bands, 60-85μ or 85-125μ\m 125-210μ m, over a field view ~1.75'x3.5', close Nyquist...
We summarize the first results from Gould Belt survey, obtained toward Aquila Rift and Polaris Flare regions during 'science demonstration phase' of Herschel. Our 70-500 micron images taken in parallel mode with SPIRE PACS cameras reveal a wealth filamentary structure, as well numerous dense cores embedded filaments. Between ~ 350 500 prestellar 45-60 Class 0 protostars can be identified field, while unbound starless no are observed field. The core mass function (CMF) derived for region...
We present the first results from science demonstration phase for Hi-GAL survey, <i>Herschel<i/> key program that will map inner Galactic plane of Milky Way in 5 bands. outline our data reduction strategy and some highlights on two observed 2° × tiles approximately centered at <i>l<i/> = 30° 59°. The regions are extremely rich intense highly structured extended emission which shows a widespread organization filaments. Source SEDs can be built hundreds objects fields, physical parameters...
Hi-GAL, the Herschel infrared Galactic Plane Survey, is an Open Time Key Project of Space Observatory. It will make unbiased photometric survey inner plane by mapping a 2° wide strip in longitude range ∣l∣ < 60° five wavebands between 70 μm and 500 μm. The aim Hi-GAL to detect earliest phases formation molecular clouds high-mass stars use optimum combination wavelength coverage, sensitivity, strategy, speed deliver homogeneous census star-forming regions cold structures interstellar medium....
We present ∼kiloparsec spatial resolution maps of the CO-to-H2 conversion factor (αCO) and dust-to-gas ratio (DGR) in 26 nearby, star-forming galaxies. have simultaneously solved for αCO DGR by assuming that is approximately constant on kiloparsec scales. With this assumption, we can combine dust mass surface density, CO-integrated intensity, H i column density to solve both with no assumptions about their value or dependence metallicity other parameters. Such a study has just become...
The large amount of dust produced by this supernova may help explain the observed in young galaxies.
The KINGFISH project (Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel) is an imaging and spectroscopic survey of 61 nearby (d < 30 Mpc) galaxies, chosen to cover wide range galaxy properties local interstellar medium (ISM) environments found in the universe. Its broad goals are characterize ISM present-day heating cooling their gaseous dust components, better understand physical processes linking star formation ISM. direct descendant Spitzer Infrared Galaxies (SINGS),...
The Herschel Reference Survey is a guaranteed time key project and will be benchmark study of dust in the nearby universe. survey complement number other projects including large cosmological surveys that trace distant We use to produce images statistically-complete sample 323 galaxies at 250, 350 500 micron. volume-limited, containing sources with distances between 15 25 Mpc flux limits K-band minimize selection effects associated young high-mass stars introduce stellar mass. spans whole...
Euclid is an ESA mission designed to constrain the properties of dark energy and gravity via weak gravitational lensing galaxy clustering. It will carry out a wide area imaging spectroscopy survey (EWS) in visible near-infrared, covering roughly 15,000 square degrees extragalactic sky on six years. The wide-field telescope instruments are optimized for pristine PSF reduced straylight, producing very crisp images. This paper presents building reference survey: sequence pointings EWS, Deep...
The origin and possible universality of the stellar initial mass function (IMF) is a major issue in astrophysics. One main objectives Herschel Gould Belt Survey to clarify link between prestellar core (CMF) IMF. We present discuss derived from data for large population cores discovered with SPIRE PACS Aquila Rift cloud complex at d ~ 260 pc. detect total 541 starless entire ~11 deg^2 area field imaged 70-500 micron SPIRE/PACS. Most these appear be gravitationally bound, thus nature. Our...
We present Herschel Spectral and Photometric Imaging Receiver Fourier Transform Spectrometer (Herschel SPIRE-FTS) observations of Arp 220, a nearby ultra-luminous infrared galaxy. The FTS provides continuous spectral coverage from 190 to 670 μm, wavelength region that is either very difficult observe or completely inaccessible the ground. spectrum good measurement continuum detection several molecular atomic species. detect luminous CO (J = 4–3 13–12) water rotational transitions with...
New far-infrared and sub-millimeter photometry from the Herschel Space Observatory is presented for 61 nearby galaxies Key Insights on Nearby Galaxies: A Far-Infrared Survey with (KINGFISH) sample. The spatially-integrated fluxes are largely consistent expectations based Spitzer extrapolations to longer wavelengths using popular dust emission models. Dwarf irregular notable exceptions, as already noted by other authors, their 500um shows evidence a excess. In addition, fraction of heating...
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 new ISOCAM mid-infrared spectra of three starbursting nearby dwarf galaxies, NGC1569, NGC1140 and IIZw40 the 30Dor region LMC explore properties ISM in low-metallicity environments, also using additional sources from literature. analyse various components probed by observations compare them with other Galactic extragalactic objects. The MIR starburst are dominated [ Ne iii] S iv] lines, as well a steeply rising dust continuum. PAH bands generaly faint, both locally averaged over...
Our PACS and SPIRE images of the Aquila Rift part Polaris Flare regions, taken during science demonstration phase <i>Herschel<i/> discovered fascinating, omnipresent filamentary structures that appear to be physically related compact cores. We briefly describe a new multi-scale, multi-wavelength source extraction method used detect objects measure their parameters in our images. All extracted starless cores (541 302 Polaris) form long very narrow filaments. With its combination far-IR...
We present the initial highlights of HOBYS key program, which are based on <i>Herschel<i/> images Rosette molecular complex and maps RCW120 H ii region. Using both SPIRE at 250/350/500 <i>μ<i/>m PACS 70/160 or 100/160 <i>μ<i/>m, survey provides an unbiased complete census intermediate- to high-mass young stellar objects, some not detected by <i>Spitzer<i/>. Key core properties, such as bolometric luminosity mass (as derived from spectral energy distributions), used constrain their...
We present the first Herschel PACS and SPIRE results of Vela C molecular complex in far-infrared submillimetre regimes at 70, 160, 250, 350, 500 um, spanning peak emission cold prestellar or protostellar cores. Column density multi-resolution analysis (MRA) differentiates into five distinct sub-regions. Each sub-region displays differences their column temperature probability distribution functions (PDFs), particular, PDFs `Centre-Ridge' `South-Nest' sub-regions appear stark contrast to each...
The <i>Herschel<i/> Space Observatory enables us to accurately measure the bolometric output of starburst galaxies and active galactic nuclei (AGN) by directly sampling peak their far-infrared (IR) emission. Here we examine whether spectral energy distribution (SED) dust temperature have strongly evolved over last 80% age Universe. We discuss possible consequences for determination star-formation rates (SFR) any evidence a major change in properties. use deep extragalactic surveys from 100...
We present an overview of the HERschel Inventory The Agents Galaxy Evolution (HERITAGE) in Magellanic Clouds project, which is a Herschel Space Observatory open time key program. mapped Large Cloud (LMC) and Small (SMC) at 100, 160, 250, 350, 500 μm with Spectral Photometric Imaging Receiver (SPIRE) Photodetector Array Camera Spectrometer (PACS) instruments on board using SPIRE/PACS parallel mode. overriding science goal HERITAGE to study life cycle matter as traced by dust LMC SMC....
The dust properties in the Large and Small Magellanic clouds (LMC/SMC) are studied using HERITAGE Herschel Key Project photometric data five bands from 100 to 500 μm. Three simple models of emission were fit observations: a single temperature blackbody modified by power-law emissivity (SMBB), broken (BEMBB), two blackbodies with different temperatures, both same (TTMBB). Using these models, we investigate origin submillimeter excess, defined as above that expected SMBB observations <200 We...
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...
In order to characterise the cloud structures responsible for formation of high-mass stars, we present Herschel observations DR21 environment. Maps column density and dust temperature unveil structure ridge several connected filaments. The has densities higher than 1023 cm-2 over a region 2.3 pc2. It shows substructured profiles branches into two major filaments in north. masses range between 130 1400 M⊙, whereas mass is 15 000 M⊙. accretion these onto ridge, suggested by previous molecular...