Jean‐Paul Kneib
A5004193106- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- CCD and CMOS Imaging Sensors
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Remote Sensing in Agriculture
- Superconducting and THz Device Technology
- History and Developments in Astronomy
- Astro and Planetary Science
- Pulsars and Gravitational Waves Research
- Advanced Vision and Imaging
- Space Satellite Systems and Control
- Advanced Image Processing Techniques
- Particle Accelerators and Free-Electron Lasers
École Polytechnique Fédérale de Lausanne
2016-2025
Laboratoire d’Astrophysique de Marseille
2015-2025
Château Gombert
2009-2025
Czech Academy of Sciences, Institute of Physics
2022-2025
Centre National de la Recherche Scientifique
2015-2024
Aix-Marseille Université
2015-2024
Leibniz Institute for Astrophysics Potsdam
2018-2022
University of Sussex
2022
American University of Sharjah
2022
Taras Shevchenko National University of Kyiv
2022
Building on the legacy of Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program four spectroscopic surveys three scientific themes: dark energy cosmological parameters, history structure Milky Way, population giant planets around other stars. In keeping with SDSS tradition, will provide regular public releases all its data, beginning Data Release 8 (DR8), which was made in 2011 January includes SDSS-I SDSS-II images spectra reprocessed latest pipelines calibrations produced for...
We explore the inter-relationships between mass, star-formation rate and environment in SDSS, zCOSMOS other surveys. The differential effects of mass are completely separable to z ~ 1, indicating that two distinct processes operating, "mass-quenching" "environment-quenching". Environment-quenching, at fixed over-density, evidently does not change with epoch suggesting it occurs as large-scale structure develops Universe. observed constancy mass-function shape for star-forming galaxies,...
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...
ABSTRACT The Sloan Digital Sky Survey III (SDSS-III) presents the first spectroscopic data from Baryon Oscillation Spectroscopic (BOSS). This ninth release (DR9) of SDSS project includes 535,995 new galaxy spectra (median z ∼ 0.52), 102,100 quasar 2.32), and 90,897 stellar spectra, along with presented in previous releases. These were obtained BOSS spectrograph taken between 2009 December 2011 July. In addition, parameters pipeline, which determines radial velocities, surface temperatures,...
The Sloan Digital Sky Survey (SDSS) started a new phase in August 2008, with instrumentation and surveys focused on Galactic structure chemical evolution, measurements of the baryon oscillation feature clustering galaxies quasar Ly alpha forest, radial velocity search for planets around ~8000 stars. This paper describes first data release SDSS-III (and eighth counting from beginning SDSS). includes five-band imaging roughly 5200 deg^2 Southern Cap, bringing total footprint SDSS to 14,555...
The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in clustering matter over a larger volume than combined efforts all previous spectroscopic surveys large-scale structure. BOSS uses 1.5 million luminous galaxies as faint i = 19.9 10,000 deg2 BAO redshifts z < 0.7. Observations neutral hydrogen Lyα forest more 150,000 quasar spectra (g 22) will constrain redshift range 2.15 3.5. Early results from include first detection...
Abstract The DESI Legacy Imaging Surveys ( http://legacysurvey.org/ ) are a combination of three public projects (the Dark Energy Camera Survey, the Beijing–Arizona Sky and Mayall z -band Survey) that will jointly image ≈14,000 deg 2 extragalactic sky visible from northern hemisphere in optical bands g , r using telescopes at Kitt Peak National Observatory Cerro Tololo Inter-American Observatory. combined survey footprint is split into two contiguous areas by Galactic plane. imaging...
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 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...
We present measurements of galaxy clustering from the Baryon Oscillation Spectroscopic Survey (BOSS), which is part Sloan Digital Sky III (SDSS-III). These use Data Release 9 (DR9) CMASS sample, contains 264 283 massive galaxies covering 3275 square degrees with an effective redshift z = 0.57 and range 0.43 < 0.7. Assuming a concordance ΛCDM cosmological model, this sample covers volume 2.2 Gpc3, represents largest Universe ever surveyed at density, . measure angle-averaged correlation...
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,...
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%...
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 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...
We present spectroscopic redshifts of a large sample galaxies with IAB < 22.5 in the COSMOS field, measured from spectra 10,644 objects that have been obtained first two years observations zCOSMOS-bright redshift survey. These include statistically complete subset 10,109 objects. The average accuracy individual is 110 km s−1, independent redshift. reliability described by Confidence Class has empirically calibrated through repeat over 600 galaxies. There very good agreement between and...
In this paper, we describe a procedure for modelling strong lensing galaxy clusters with parametric methods, and to rank models quantitatively using the Bayesian evidence. We use publicly available Markov chain Monte-Carlo (MCMC) sampler ('bayesys'), allowing us avoid local minima in likelihood functions. To illustrate power of MCMC technique, simulate three galaxies, each composed cluster-scale halo set perturbing galaxy-scale subhalos. ray-trace light beams through model produce catalogue...
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,...
In this paper we present results from an IRAM Plateau de Bure millimetre-wave Interferometer (PdBI) survey for CO emission towards radio-detected submillimetre galaxies (SMGs) with known optical and near-infrared spectroscopic redshifts. Five sources in the redshift range z~1-3.5 were detected, nearly doubling number of SMGs detected CO. We summarise properties all 12 CO-detected SMGs, as well 6 not by our survey, use sample to explore bulk physical SMG population a whole. The median line...
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...
We present new improved constraints on the Hubble parameter H ( z ) in redshift range 0.15 < 1.1, obtained from differential spectroscopic evolution of early-type galaxies as a function redshift. extract large sample ∼ 11000) several surveys, spanning almost 8 billion years cosmic lookback time (0.15 1.42). select most massive, red elliptical galaxies, passively evolving and without signature ongoing star formation. Those can be used standard chronometers, firstly proposed by Jimenez...
We present a striking new Hubble Space Telescope (HST) observation of the rich cluster Abell 2218 taken with Wide Field Planetary Camera 2. HST's restored image quality reveals sizable number gravitationally lensed features in this cluster, significantly more than had been identified by using ground-based telescopes. The brightest arcs are resolved HST and show internal that enable us to identify multiply imaged examples, confirming improving mass models determined from observations....