H. M. Courtois
A5091590493- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Impact of Light on Environment and Health
- Calibration and Measurement Techniques
- History and Developments in Astronomy
- Remote Sensing in Agriculture
- Astro and Planetary Science
- Advanced Vision and Imaging
- Spectroscopy and Laser Applications
- Spectroscopy and Chemometric Analyses
- Advanced Physical and Chemical Molecular Interactions
- Computational Physics and Python Applications
- Pituitary Gland Disorders and Treatments
Université Claude Bernard Lyon 1
2015-2025
Centre National de la Recherche Scientifique
2015-2025
Institut de Physique des 2 Infinis de Lyon
2019-2025
Institute of Nuclear Physics of Lyon
2015-2025
Institut National de Physique Nucléaire et de Physique des Particules
2014-2025
University of Cambridge
2023
Institut de Physique
2009-2020
University of Hawaii System
2007-2016
Centre de Recherche Astrophysique de Lyon
2004-2010
École Normale Supérieure de Lyon
2010
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...
A database can be accessed on the Web at http://edd.ifa.hawaii.edu that was developed to promote access information related galaxy distances. The has three functional components. First, tables from many literature sources have been gathered and enhanced with links through a distinct naming convention. Second, comparisons of results both levels parameters techniques begun are continuing, leading increasing homogeneity consistency distance measurements. Third, new material is presented arising...
ABSTRACT The Cosmicflows database of galaxy distances that in the second edition contained 8188 entries is now expanded to 17,669 entries. major additions are 2257 we have derived from correlation between rotation and luminosity with photometry at <?CDATA $3.6\,\mu {\rm{m}}$?> obtained Spitzer Space Telescope 8885 based on Fundamental Plane methodology Six Degree Field Galaxy Survey collaboration. There minor augmentations Tip Red Giant Branch Type I a supernova compilations. A zero-point...
We present the compilation catalogue of redshift-independent distances included in HyperLEDA database. It is actively maintained to be up-to-date, and current version counts 6640 distance measurements for 2335 galaxies compiled from 430 published articles. Each individual series recalibrated onto a common scale based on carefully selected set high-quality measurements. This information together with data HI line-width, central velocity dispersion, magnitudes, diameters, redshift used derive...
The peculiar velocity of the Local Group galaxies manifested in Cosmic Microwave Background dipole is found to decompose into three dominant components. components are clearly separated because they arise on distinct spatial scales and fortuitously almost orthogonal their influences. nearest, which distinguished by a discontinuity at ~7 Mpc, arises from evacuation Void. We lie Sheet that bounds void. Random motions within small. Our Galaxy participates bulk motion away component our an...
Cosmicflows-2 is a compilation of distances and peculiar velocities for over 8000 galaxies. Numerically the largest contributions come from luminosity–line width correlation spirals, Tully–Fisher relation (TFR), related fundamental plane E/S0 systems, but 1000 are contributed by methods that provide more accurate individual distances: Cepheid, tip red giant branch (TRGB), surface brightness fluctuation, Type Ia supernova, several miscellaneous procedures. Our collaboration making important...
The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct expansion history Universe growth cosmic structures. Estimation expected performance experiment, in terms predicted constraints on cosmological parameters, has so far relied different methodologies numerical implementations, developed for observational probes their combination. In this paper we present validated forecasts, that combine both theoretical expertise probes. This is presented provide...
We introduce SoFiA, a flexible software application for the detection and parametrization of sources in 3D spectral line data sets. SoFiA combines first time single piece set new source-finding algorithms developed on way to future H i surveys with ASKAP (WALLABY, DINGO) APERTIF. It is designed enable general use these by community broad range The key advantages are ability to: search emission multiple scales detect complete reliable way, taking into account noise level variations presence...
We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), fast and accurate predictor for nonlinear correction matter power spectrum. Percent-level emulation is now supported in eight-dimensional parameter space $w_0w_a$CDM$+\sum m_\nu$models between redshift $z=0$ $z=3$ spatial scales within range 0.01 $h$/Mpc $\leq k \leq$ 10 $h$/Mpc. In order to achieve this level accuracy, we have had improve quality underlying N-body simulations used as training data: (1) use...
With Cosmicflows-4, distances are compiled for 55,877 galaxies gathered into 38,065 groups. Eight methodologies employed, with the largest numbers coming from correlations between photometric and kinematic properties of spiral (TF) elliptical (FP). Supernovae that arise degenerate progenitors (type Ia Sne) an important overlapping component. Smaller contributions come distance estimates surface brightness fluctuations luminosities expansion rates core collapse supernovae (SNII). Cepheid...
will provide deep near-infrared (NIR) imaging to ∼26.5 AB magnitude over ∼59 deg^2 in its and auxiliary fields. The Cosmic DAWN survey combines dedicated archival UV--NIR observations matched depth multiwavelength of the consistently measured NIR-selected photometric catalogues, accurate redshifts, measurements galaxy properties a redshift z∼ 10. catalogues include Spitzer IRAC data that are critical for stellar mass at z ≳ 2.5 high-z science. These complement standard which not data. In...
The Spitzer Survey of Stellar Structure in Galaxies (S4G) is the largest available database deep, homogeneous middle-infrared (mid-IR) images galaxies all types. survey, which includes 2352 nearby galaxies, reveals galaxy morphology only minimally affected by interstellar extinction. This paper presents an atlas and classifications S4G Comprehensive de Vaucouleurs revised Hubble-Sandage (CVRHS) system. CVRHS system follows precepts classical (1959) morphology, modified to include recognition...
The Spitzer Survey of Stellar Structure in Galaxies is a volume, magnitude, and size-limited survey 2352 nearby galaxies with deep imaging at 3.6 4.5 μm.In this paper, we describe our surface photometry pipeline showcase the associated data products that have released to community.We also identify physical mechanisms leading different levels central stellar mass concentration for same total mass.Finally, derive local mass-size relation μm morphologies.Our radial profiles reach densities...
This paper involves a data release of the observational campaign: Cosmicflows with Spitzer (CFS). Surface photometry 1270 galaxies constituting survey is presented. An additional ∼400 from various other surveys are also analysed. CFS complements Survey Stellar Structure in Galaxies, that provides for an 2352 galaxies, by extending observations to low galactic latitudes (|b| < 30°). Among these calibrators, selected K band, Tully–Fisher relation. The addition new calibrators demonstrates...
Recent observational studies have demonstrated that the majority of satellite galaxies tend to orbit their hosts on highly flattened, vast, possibly corotating planes. Two nearly parallel planes satellites been confirmed around M31 galaxy and Centaurus A galaxy, while Milky Way also sports a plane satellites. It has argued such an alignment vast is unexpected in standard Λ cold dark matter (ΛCDM) model cosmology if not even contradiction its generic predictions. Guided by ΛCDM numerical...
Abstract This study is a part of the Cosmicflows-4 project with aim measuring distances more than ∼10,000 spiral galaxies in local universe up to ∼15,000 <?CDATA $\mathrm{km}\,{{\rm{s}}}^{-1}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>km</mml:mi> <mml:mspace width="0.25em" /> <mml:msup> <mml:mrow> <mml:mi mathvariant="normal">s</mml:mi> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:msup> </mml:math> . New H i line width information has...
We present the Hestia simulation suite: High-resolutions Environmental Simulations of The Immediate Area, a set cosmological simulations Local Group. Initial conditions constrained by observed peculiar velocity nearby galaxies are employed to accurately simulate local cosmography. Halo pairs that resemble Group found in low resolutions constrained, dark matter only simulations, and selected for higher resolution magneto hydrodynamic using Arepo code. Baryonic physics follows Auriga model...
Abstract Tools are provided at the Extragalactic Distance Database website which provide relationships between distances and velocities of galaxies based on smoothed versions velocity fields derived by Cosmicflows program.
Abstract Separating the components of redshift due to expansion and peculiar motion in nearby universe ( z < 0.1) is critical for using Type Ia Supernovae (SNe Ia) measure Hubble constant H 0 ) equation-of-state parameter dark energy w ). Here, we study two dominant “motions” contributing velocities: large-scale, coherent-flow (CF) motions small-scale gravitationally associated galaxies deemed be a galaxy group. We use set 584 low- SNe from Pantheon+ sample, evaluate efficacy corrections...
Primordial features, in particular oscillatory signals, imprinted the primordial power spectrum of density perturbations represent a clear window opportunity for detecting new physics at high-energy scales. Future spectroscopic and photometric measurements from $Euclid$ space mission will provide unique constraints on spectrum, thanks to redshift coverage high-accuracy measurement nonlinear scales, thus allowing us investigate deviations standard power-law spectrum. We consider two models...
An important component of the Extragalactic Distance Database (EDD) at http://edd.ifa.hawaii.edu is a group catalogs related to measurement HI line profile parameters. One these All Digital catalog which contains an amalgam information from new data and old. The results observations with Arecibo Parkes telescopes Green Bank Telescope (GBT), including continuing input since award NRAO Cosmic Flows Large Program. old has been collected archives, wherever available, particularly Cornell...
This paper presents an analysis of the local peculiar velocity field based on Wiener Filter reconstruction method. We used our currently available catalog distance measurements containing 1,797 galaxies within 3000 km/s: Cosmicflows-1. The method is to recover full 3D from observed map radial velocities and underlying linear density field. a data zone km/s decomposed into component that generated tidal one by mass distribution outside zone. characterized coherent flow toward...