A5057229420- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- CCD and CMOS Imaging Sensors
- Astro and Planetary Science
- Superconducting and THz Device Technology
- Scientific Research and Discoveries
- Dark Matter and Cosmic Phenomena
- Remote Sensing in Agriculture
- History and Developments in Astronomy
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
- Scientific Measurement and Uncertainty Evaluation
- Atmospheric Ozone and Climate
- Particle accelerators and beam dynamics
CEA Paris-Saclay
2015-2025
Université Paris Cité
2016-2025
Astrophysique, Instrumentation et Modélisation
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
Université Paris-Saclay
2008-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2010-2024
Délégation Paris 7
2013-2024
Sorbonne Paris Cité
2018-2024
Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules
2023
The Cosmic Evolution Survey (COSMOS) is designed to probe the correlated evolution of galaxies, star formation, active galactic nuclei (AGN) and dark matter (DM) with large-scale structure (LSS) over redshift range z $> 0.5 $ 6. survey includes multi-wavelength imaging spectroscopy from X-ray radio wavelengths covering a 2 $\sq$°area, including HST imaging. Given very high sensitivity resolution these datasets, COSMOS also provides unprecedented samples objects at greatly reduced cosmic...
The ESA's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14 May 2009 has been scanning microwave submillimetre sky continuously since 12 August 2009. This paper gives an overview of mission performance, processing, analysis, characteristics data, scientific results, science data products papers in release. include maps CMB diffuse extragalactic foregrounds, a catalogue compact Galactic sources, list sources detected through SZ effect....
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.
ABSTRACT We present the COSMOS2015 24 catalog, which contains precise photometric redshifts and stellar masses for more than half a million objects over 2deg 2 COSMOS field. Including new <?CDATA ${{YJHK}}_{{\rm{s}}}$?> images from UltraVISTA-DR2 survey, Y-band Subaru/Hyper-Suprime-Cam, infrared data Spitzer Large Area Survey with Hyper-Suprime-Cam legacy program, this near-infrared-selected catalog is highly optimized study of galaxy evolution environments in early universe. To maximize...
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 accurate photometric redshifts (photo-z) in the 2-deg2 COSMOS field. The are computed with 30 broad, intermediate, and narrowbands covering UV (Galaxy Evolution Explorer), visible near-IR (NIR; Subaru, Canada–France–Hawaii Telescope (CFHT), United Kingdom Infrared Telescope, National Optical Astronomy Observatory), mid-IR (Spitzer/IRAC). A χ2 template-fitting method (Le Phare) was used calibrated large spectroscopic samples from Very Large Visible Multi-Object Spectrograph Keck...
zCOSMOS is a large-redshift survey that being undertaken in the COSMOS field using 600 hr of observation with VIMOS spectrograph on 8 m VLT. The designed to characterize environments galaxies from 100 kpc scales galaxy groups up Mpc scale cosmic web and produce diagnostic information active galactic nuclei. consists two parts: (1) zCOSMOS-bright, magnitude-limited I-band IAB < 22.5 sample about 20,000 0.1 z 1.2 covering whole 1.7 deg2 ACS field, for which parameters at ~ 0.7 are be directly...
Two main modes of star formation are know to control the growth galaxies: a relatively steady one in disk-like galaxies, defining tight rate (SFR)–stellar mass sequence, and starburst mode outliers such sequence which is generally interpreted as driven by merging. Such galaxies rare but have much higher SFRs, it interest establish relative importance these two modes. PACS/Herschel observations over whole COSMOS GOODS-South fields, conjunction with previous optical/near-IR data, allowed us...
We present imaging data and photometry for the COSMOS survey in 15 photometric bands between 0.3 2.4 μm. These include taken on Subaru 8.3 m telescope, KPNO CTIO 4 telescopes, CFHT 3.6 telescope. Special techniques are used to ensure that relative calibration is better than 1% across field of view. The absolute accuracy from standard-star measurements found be 6%. corrected using galaxy spectra, providing colors accurate 2% or better. Stellar counts agree well with expected values. Finally,...
The Herschel Multi-tiered Extragalactic Survey (HerMES) is a legacy programme designed to map set of nested fields totalling ∼380 deg2. Fields range in size from 0.01 ∼20 deg2, using the Herschel-Spectral and Photometric Imaging Receiver (SPIRE) (at 250, 350 500 μm) Herschel-Photodetector Array Camera Spectrometer (PACS) 100 160 μm), with an additional wider component 270 deg2 SPIRE alone. These bands cover peak redshifted thermal spectral energy distribution interstellar dust thus capture...
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....
We analyze the dependence of galaxy structure (size and Sersic index) mode star formation (\Sigma_SFR SFR_IR/SFR_UV) on position galaxies in SFR versus Mass diagram. Our sample comprises roughly 640000 at z~0.1, 130000 z~1, 36000 z~2. Structural measurements for all but z~0.1 were based HST imaging, SFRs are derived using a Herschel-calibrated ladder indicators. find that correlation between stellar population (i.e., 'Hubble sequence') is already place since least z~2.5. At epochs, typical...
We follow the galaxy stellar mass assembly by morphological and spectral type in COSMOS 2 deg2 field. derive functions densities from z = to 0.2 using 196,000 galaxies selected at F3.6 μm > 1 μJy with accurate photometric redshifts ( i+ < 22.5). Using a classification, we find that ∼ is an epoch of transition quiescent galaxies. Their density increases 1.1 dex between 1.5–2 0.8–1 (Δt 2.5 Gyr), but only 0.3 0.1 6 Gyr). Then, add information 80%–90% massive have elliptical morphology 0.8....
We describe the details of Hubble Space Telescope (HST) Advanced Camera for Surveys / Wide Field Channel (ACS/WFC) observations COSMOS field, including data calibration and processing procedures. obtained a total 583 orbits HST ACS/WFC imaging in F814W filter, covering field that is 1.64 square degrees area, largest contiguous ever imaged with HST. The median exposure depth across 2028 seconds (one orbit), achieving limiting point-source AB(F814W) = 27.2 (5 sigma). also present about...
The IFA and collaborators are embarking on a project to develop 4-telescope synoptic survey instrument. While somewhat smaller than the 6.5m class telescope envisaged by decadal review in their proposal for LSST, this facility will nonetheless be able accomplish many of LSST science goals. In paper we describe motivation 'distributed aperture' approach current concept Pan-STARRS -- pilot proper its performance goals reach. We also discuss how may expanded.
The Spitzer-COSMOS survey (S-COSMOS) is a Legacy program (Cycles 2+3) designed to carry out uniform deep of the full 2 sq deg COSMOS field in all seven Spitzer bands (3.6, 4.5, 5.6, 8.0, 24.0, 70.0, 160.0 u). This paper describes parameters, mapping strategy, data reduction procedures, achieved sensitivities date, and complete set for future reference. We show that observed infrared backgrounds S-COSMOS are within 10% predicted background levels. fluctuations at 24u have been measured do not...
The Cosmic Evolution Survey (COSMOS) was initiated with an extensive allocation (590 orbits in Cycles 12-13) using the Hubble Space Telescope (HST) for high resolution imaging. Here we review characteristics of HST imaging Advanced Camera Surveys (ACS) and parallel observations NICMOS WFPC2. A square field (1.8$\sq$\deg) has been imaged single-orbit ACS I-F814W exposures 50% completeness sources 0.5\arcsec diameter at I$_{AB} $ = 26.0 mag. is a key part COSMOS survey, providing very...
ALMA Cycle 2 observations of the long wavelength dust emission in 145 star-forming galaxies are used to probe evolution ISM. We also develop physical basis and empirical calibration (with 72 low-z z ~ galaxies) for using continuum as a quantitative interstellar medium (ISM) masses. The with highest star formation rates (SFRs) at <z> = 2.2 4.4 have gas masses up 100 times that Milky Way mass fractions reaching 50 80%, i.e. 1 - 4 their stellar find single high-z law: SFR 35 M_ mol^0.89 x...
We present an analysis of the deepest Herschel images in four major extragalactic fields GOODS-North, GOODS-South, UDS and COSMOS obtained within GOODS-Herschel CANDELS-Herschel key programs. The picture provided by 10497 individual far-infrared detections is supplemented stacking a mass-complete sample 62361 star-forming galaxies from CANDELS-HST H band-selected catalogs two deep ground-based Ks GOODS-North COSMOS-wide fields, order to obtain one most accurate unbiased understanding date...
We present photometric and spectroscopic observations of 23 high-redshift supernovae (SNe) spanning a range z = 0.34-1.03, nine which are unambiguously classified as Type Ia. These SNe were discovered during the IfA Deep Survey, began in 2001 September observed total 2.5 deg2 to depth approximately m ≈ 25-26 RIZ over 9-17 visits, typically every 1-3 weeks for nearly 5 months, with additional continuing until 2002 April. give brief description survey motivations, observational strategy,...
In the standard scenario for galaxy evolution young star-forming galaxies transform into red bulge-dominated spheroids, where star formation has been quenched. To explain this transformation, a strong negative feedback generated by accretion onto central super-massive black hole is often invoked. The depletion of gas resulting from quasar-driven outflows should eventually stop star-formation across host and lead to “suicide” starvation. Direct observational evidence major quasar still...
We exploit the deep and extended far infrared data sets (at 70, 100 160 um) of Herschel GTO PACS Evolutionary Probe (PEP) Survey, in combination with HERschel Multi tiered Extragalactic Survey (HerMES) at 250, 350 500 um, to derive evolution restframe 35 60 90 total (IR) luminosity functions (LFs) up z~4. detect very strong for IR LF combined a density evolution. In agreement previous findings, increases steeply z~1, then flattens between z~1 z~3 decrease z greater than 3. Galaxies different...
We describe the all-sky Planck catalogue of clusters and cluster candidates derived from Sunyaev--Zeldovich (SZ) effect detections using first 15.5 months satellite observations. The contains 1227 entries, making it over six times size Early SZ (ESZ) sample largest SZ-selected to date. It 861 confirmed clusters, which 178 have been as mostly through follow-up observations, a further 683 are previously-known clusters. remaining 366 status candidates, we divide them into three classes...
Deep far-infrared photometric surveys studying galaxy evolution and the nature of cosmic infrared background are a key strength Herschel mission. We describe scientific motivation for PACS Evolutionary Probe (PEP) guaranteed time program its role in complement surveys, field selection which includes popular multiwavelength fields such as GOODS, COSMOS, Lockman Hole, ECDFS, EGS. provide an account observing strategies data reduction methods used. An overview first science results illustrates...