A5062310309- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- High-Energy Particle Collisions Research
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Radiation Detection and Scintillator Technologies
- CCD and CMOS Imaging Sensors
CEA Paris-Saclay
2016-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
Institut de Recherche sur les Lois Fondamentales de l'Univers
2016-2025
Laboratoire de Physique Nucléaire et de Hautes Énergies
2025
Carnegie Observatories
2015-2024
Carnegie Institution for Science
2016-2024
Université Paris-Saclay
2017-2023
Université Paris Cité
2015-2022
Infrared Processing and Analysis Center
2014-2017
California Institute of Technology
2014-2017
We present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of 5-year Supernova Legacy Survey (SNLS). These events were detected and their multi-color light-curves measured using MegaPrime/MegaCam instrument at Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in bands, as part CFHT (CFHTLS). Follow-up spectroscopy was performed VLT, Gemini Keck telescopes confirm nature measure redshift. With this data...
We present a new compilation of Type Ia supernovae (SNe Ia), dataset low-redshift nearby-Hubble-flow SNe and analysis procedures to work with these heterogeneous compilations. This ``Union'' 414 SN Ia, which reduces 307 after selection cuts, includes the recent large samples from Supernova Legacy Survey ESSENCE Survey, older datasets, as well recently extended distant observed HST. A single, consistent blind procedure is used for all various subsamples, implemented that consistently weights...
We present the cosmological implications from final measurements of clustering using galaxies, quasars, and Ly$\alpha$ forests completed Sloan Digital Sky Survey (SDSS) lineage experiments in large-scale structure. These experiments, composed data SDSS, SDSS-II, BOSS, eBOSS, offer independent baryon acoustic oscillation (BAO) angular-diameter distances Hubble relative to sound horizon, $r_d$, eight different samples six growth rate parameter, $f\sigma_8$, redshift-space distortions (RSD)....
We combine high redshift Type Ia supernovae from the first 3 years of Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample 472 SNe (123 low-$z$, 93 SDSS, 242 SNLS, and 14 {\it Hubble Space Telescope}). SN data alone require cosmic acceleration >99.9% confidence, including systematic effects. For dark energy equation state parameter (assumed constant out least $z=1.4$) in flat universe, we find $w =...
We derive constraints on cosmological parameters and tests of dark energy models from the combination baryon acoustic oscillation (BAO) measurements with cosmic microwave background (CMB) Type Ia supernova (SN) data. take advantage high-precision BAO galaxy clustering Ly-alpha forest (LyaF) in BOSS survey SDSS-III. data alone yield a high confidence detection energy, CMB angular scale they further imply nearly flat universe. Combining SN into an "inverse distance ladder" yields 1.7%...
Aims. The EROS-2 project was designed to test the hypothesis that massive compact halo objects (the so-called "machos") could be a major component of dark matter Milky Way galaxy. To this end, monitored over 6.7 years stars in Magellanic clouds for microlensing events caused by such objects.
We present an empirical model of Type Ia supernovae spectro-photometric evolution with time. The is built using a large data set including light-curves and spectra both nearby distant supernovae, the latter being observed by SNLS collaboration. derive average spectral sequence their main variability components color variation law. allows us to measure distance moduli in range 2500-8000 A calculable uncertainties, those arising from features. Thanks use high-redshift SNe rest-frame UV energy...
We measure the large-scale cross-correlation of quasars with Lyman alpha forest absorption, using over 164,000 from Data Release 11 SDSS-III Baryon Oscillation Spectroscopic Survey. extend previous study roughly 60,000 9 to larger separations, allowing a measurement Baryonic Acoustic (BAO) scale along line sight $c/(H(z=2.36) ~ r_s) = 9.0 \pm 0.3$ and across $D_A(z=2.36) / r_s 10.8 0.4$, consistent CMB other BAO data. Using best fit value sound horizon Planck data ($r_s=147.49 Mpc$), we can...
We report a detection of the baryon acoustic oscillation (BAO) feature in flux-correlation function Ly{\alpha} forest high-redshift quasars with statistical significance five standard deviations. The study uses 137,562 redshift range $2.1\le z \le 3.5$ from Data Release 11 (DR11) Baryon Oscillation Spectroscopic Survey (BOSS) SDSS-III. This sample contains three times number used previous studies. measured position BAO peak determines angular distance, $D_A(z=2.34)$ and expansion rate,...
We present observational constraints on the nature of dark energy using Supernova Legacy Survey three-year sample (SNLS3) Guy et al. and Conley use 472 Type Ia supernovae (SNe Ia) in this sample, accounting for recently discovered correlations between SN luminosity host galaxy properties, include effects all identified systematic uncertainties directly cosmological fits. Combining SNLS3 data with full WMAP7 power spectrum, Sloan Digital Sky luminous red a prior Hubble constant H0 from SHOES,...
(Abridged) Precision cosmology with Type Ia supernovae (SNe Ia) makes use of the fact that SN luminosities depend on their light-curve shapes and colours. Using Supernova Legacy Survey (SNLS) other data, we show there is an additional dependence global characteristics host galaxies: events same shape colour are, average, 0.08mag (~4.0sigma) brighter in massive galaxies (presumably metal-rich) low specific star-formation rates (sSFR). SNe a sSFR also have smaller slope ("beta") between...
We present the final Sloan Digital Sky Survey IV (SDSS-IV) quasar catalog from Data Release 16 of extended Baryon Oscillation Spectroscopic (eBOSS). This comprises largest selection spectroscopically confirmed quasars to date. The full includes two sub-catalogs: a "superset" all SDSS-IV/eBOSS objects targeted as containing 1,440,615 observations and quasar-only 750,414 quasars, including 225,082 new appearing in an SDSS data release for first time, well known SDSS-I/II/III. automated...
We present a new and independent determination of the local value Hubble constant based on calibration Tip Red Giant Branch (TRGB) applied to Type Ia supernovae (SNeIa). find Ho = 69.8 +/- 0.8 (+/-1.1\% stat) 1.7 (+/-2.4\% sys) km/sec/Mpc. The TRGB method is both precise accurate, parallel to, but Cepheid distance scale. Our sits midway in range defined by current tension. It agrees at 1.2-sigma level with that Planck 2018 estimate, 1.7-sigma SHoES measurement distances have been measured...
(ABRIDGED) We show that Type Ia supernovae (SNe Ia) are formed within both very young and old stellar populations, with observed rates depend on the mass mean star-formation (SFRs) of their host galaxies. Models where SN rate depends solely galaxy ruled out 99% confidence. Our analysis is based 100 spectroscopically-confirmed SNe Ia, plus 24 photometrically-classified events, all from Supernova Legacy Survey (SNLS) distributed over 0.2
We report a detection of the baryon acoustic oscillation (BAO) feature in three-dimensional correlation function transmitted flux fraction \Lya forest high-redshift quasars. The study uses 48,640 quasars redshift range $2.1\le z \le 3.5$ from Baryon Oscillation Spectroscopic Survey (BOSS) third generation Sloan Digital Sky (SDSS-III). At mean $z=2.3$, we measure monopole and quadrupole components for separations $20\hMpc<r<200\hMpc$. A peak is seen at separation equal to $(1.01\pm0.03)$...
The Great Observatories All-Sky LIRG Survey (GOALS20 ) combines data from NASA's Spitzer Space Telescope,Chandra X-Ray Observatory,Hubble Telescope (HST), and Galaxy Evolution Explorer (GALEX) observatories, together with ground-based data, into a comprehensive imaging spectroscopic survey of over 200 low-redshift (z < 0.088), Luminous Infrared Galaxies (LIRGs). LIRGs are complete subset the IRAS Revised Bright Sample (RBGS), which comprises 629 extragalactic objects 60 μm flux densities...
Abstract We present a measurement of baryonic acoustic oscillations (BAOs) from Ly α absorption and quasars at an effective redshift <?CDATA $z=2.33$?> using the complete extended Baryonic Oscillation Spectroscopic Survey (eBOSS). The 16th final eBOSS data release (SDSS DR16) contains all its predecessor, (BOSS), providing 210,005 with z q > 2.10 that are used to measure absorption. BAO scale both in autocorrelation cross-correlation 341,468 1.77. Apart statistical gain new deeper...
We present constraints on neutrino masses, the primordial fluctuation spectrum from inflation, and other parameters of ΛCDM model, using one-dimensional Lyα-forest power measured by [1] Baryon Oscillation Spectroscopic Survey (BOSS) Sloan Digital Sky (SDSS-III), complemented Planck 2015 cosmic microwave background (CMB) data cosmological probes. This paper improves previous analysis [2] a more powerful set calibrating hydrodynamical simulations that reduces uncertainties associated with...
We use the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 9 (DR9) to detect and measure position of Baryonic Acoustic (BAO) feature in three-dimensional correlation function Lyman-α flux fluctuations at a redshift zeff = 2.4. The is clearly detected significance between 3 5 sigma (depending on broadband model method error covariance matrix estimation) consistent with predictions standard ΛCDM model. assess biases our method, stability possible systematic effects. fit resulting...
We present a measurement of baryon acoustic oscillations (BAO) in the cross-correlation quasars with Ly$\alpha$-forest flux-transmission at mean redshift $z=2.40$. The uses complete SDSS-III data sample: 168,889 forests and 234,367 from SDSS Data Release DR12. In addition to statistical improvement on our previous study using DR11, we have implemented numerous improvements analysis level allowing more accurate this cross-correlation. also developed first simulations us test different aspects...
We present a measurement of the baryon acoustic oscillation (BAO) scale at redshift $z=2.35$ from three-dimensional correlation Lyman-$\alpha$ (Ly$\alpha$) forest absorption and quasars. The study uses 266,590 quasars in range $1.77<z<3.5$ Sloan Digital Sky Survey (SDSS) Data Release 14 (DR14). sample includes first two years observations by SDSS-IV extended Baryon Oscillation Spectroscopic (eBOSS), providing new re-observations BOSS for improved statistical precision. Statistics are further...