A5014596652- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Radio Astronomy Observations and Technology
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Advanced optical system design
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Optical Polarization and Ellipsometry
- Cosmology and Gravitation Theories
- Planetary Science and Exploration
- Plant Water Relations and Carbon Dynamics
- Optical Coatings and Gratings
- Astro and Planetary Science
- Semiconductor Lasers and Optical Devices
Observatoire de Lyon
2011-2024
Université Claude Bernard Lyon 1
2015-2024
Centre de Recherche Astrophysique de Lyon
2015-2024
Centre National de la Recherche Scientifique
2015-2024
École Normale Supérieure de Lyon
2011-2023
Université de Lyon
2019
Centre de Recherche en Linguistique Appliquée
2019
Innowep (Germany)
2014
Leibniz Institute for Astrophysics Potsdam
2014
University of Oxford
2014
We investigate with unprecedented accuracy the correlations between dynamical mass-to-light ratio M/L and other global observables of E S0 galaxies. construct two-integral Jeans three-integral Schwarzschild models for a sample 25 E/S0 galaxies SAURON integral-field stellar kinematics. find tight correlation form (M/L)=(3.80+/-0.14)*(sigma/200 km/s)^(0.84+/-0.07) (in I-band) luminosity-weighted second moment (sigma) line-of-sight velocity-distribution within Re. The observed rms scatter in...
The ATLAS3D project is a multiwavelength survey combined with theoretical modelling effort. observations span from the radio to millimetre and optical, provide multicolour imaging, two-dimensional kinematics of atomic (H i), molecular (CO) ionized gas (Hβ, [O iii] [N i]), together population stars Fe5015 Mg b), for carefully selected, volume-limited (1.16 × 105 Mpc3) sample 260 early-type (elliptical E lenticular S0) galaxies (ETGs). models include semi-analytic, N-body binary mergers...
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation VLT panoramic integral-field spectrograph currently in manufacturing, assembly and integration phase. MUSE has field of 1x1 arcmin2 sampled at 0.2x0.2 arcsec2 assisted by the ground layer adaptive optics ESO facility using four laser guide stars. instrument large 24 identical high performance integral units, each one composed an advanced image slicer, 4kx4k detector. In this paper we review progress manufacturing report...
We present the emission-line fluxes and kinematics of 48 representative elliptical lenticular galaxies obtained with our custom-built integral-field spectrograph SAURON. Hb, [OIII], [NI] emission lines were measured using a new procedure that simultaneously fits both stellar spectrum lines. Using this technique we can detect down to an equivalent width 0.1A set by current limitations in describing galaxy spectra synthetic real templates, rather than quality spectra. Emission is detected 75%...
2D stellar kinematics of 48 representative E and S0 galaxies obtained with the SAURON IFS reveal that early-type appear in two broad flavours, depending on whether they exhibit clear large-scale rotation or not. We define a new parameter LambdaR which involves luminosity weighted averages over full kinematic field, as proxy to quantify observed projected angular momentum per unit mass. use it basis for classification: are separated into slow fast rotators (SRs, FRs), have values within their...
We analyse the orbital distribution of E and S0 galaxies using SAURON integral-field stellar kinematics. construct anisotropy (V/sigma,epsilon) diagram, for 48 E/S0 from survey. For a subsample 24 consistent with axisymmetry, we use three-integral axisymmetric Schwarzschild dynamical models to recover detailed find good agreement derived diagram. In companion Paper IX show that early-type can be subdivided into two classes systems or without significant amount specific angular momentum. Here...
Early results are reported from the SAURON survey of kinematics and stellar populations a representative sample nearby E, S0 Sa galaxies. The is aimed at determining intrinsic shape galaxies, their orbital structure, mass-to-light ratio as function radius, age metallicity populations, frequency kinematically decoupled cores nuclear black holes. construction described, its properties illustrated. A comparison with long-slit spectroscopic data establishes that measurements comparable to, or...
A new integral-field spectrograph, SAURON, is described. It based on the TIGER principle, and uses a lenslet array. SAURON has large field of view high throughput, allows simultaneous sky subtraction. Its design optimized for studies stellar kinematics, gas line-strength distributions nearby early-type galaxies. The instrument specifications are described, as well extensive analysis software which was developed to obtain fully calibrated spectra, associated kinematic measurements. companion...
We present the stellar kinematics of 48 representative elliptical and lenticular galaxies obtained with our custom-built integral-field spectrograph SAURON operating on William Herschel Telescope. The data were homogeneously processed through a dedicated reduction analysis pipeline. All resulting cubes spatially binned to constant minimum signal-to-noise ratio. have measured an optimized (penalized pixel-fitting) routine which fits spectra in pixel space, via use optimal templates, prevents...
We present a stellar population analysis of the absorption line strength maps for 48 early-type galaxies from SAURON sample. Using index Hβ, Fe5015 and Mg b, measured in Lick/IDS system spatially binned to constant signal-to-noise ratio, together with predictions up-to-date models, we estimate simple population-equivalent (SSP-equivalent) age, metallicity abundance ratio [α/Fe] over two-dimensional field extending up approximately one effective radius. A discussion calibrations differences...
We present the MUSE Hubble Ultra Deep Survey, a mosaic of nine fields covering 90\% entire HUDF region with 10-hour deep exposure time, plus deeper 31-hour in single 1.15 arcmin2 field. The improved observing strategy and advanced data reduction results datacubes sub-arcsecond spatial resolution (0.65 arcsec at 7000 A) accurate astrometry (0.07 rms). compare broadband photometric properties to HST photometry, finding good agreement zeropoint up mAB=28 but an increasing scatter for faint...
We introduce Zurich Atmosphere Purge (ZAP), an approach to sky subtraction based on principal component analysis (PCA) that we have developed for the Multi Unit Spectrographic Explorer (MUSE) integral field spectrograph. ZAP employs filtering and data segmentation enhance inherent capabilities of PCA subtraction. Extensive testing shows reduces emission residuals while robustly preserving flux line shapes astronomical sources. The method works in a variety observational situations from...
Processing of raw data from modern astronomical instruments is nowadays often carried out using dedicated software, so-called "pipelines" which are largely run in automated operation. In this paper we describe the reduction pipeline Multi Unit Spectroscopic Explorer (MUSE) integral field spectrograph operated at ESO's Paranal observatory. This a complex machine: it records 1152 separate spatial elements on detectors its 24 units. Efficiently handling such requires sophisticated high degree...
We observed the Hubble Deep Field South with new panoramic integral field spectrograph MUSE that we built and just commissioned at VLT. The data cube resulting from 27 hours of integration covers one arcmin^2 view an unprecedented depth a 1 sigma emission line surface brightness limit 1x$10^{-19}$ erg/s/cm$^2$/arcsec$^2$ contains ~90,000 spectra. present combined calibrated cube, perform first-pass analysis sources detected in HDF-S imaging. measured redshifts 189 up to magnitude F814W =...
We report the detection of extended Lyman-alpha (Lya) haloes around 145 individual star-forming galaxies at redshifts 3 M_{UV}> -22) Lya emitters (LAEs). Using a 2D, two-component decomposition emission assuming circular exponential distributions, we measure scale lengths and luminosities haloes. find that 80% our objects having reliable halo measurements show is significantly more than UV continuum detected by HST (by factor ~4 to >20). The median length in sample ~4.5 kpc. By...
This is the first of a series papers presenting results from our survey 25 Galactic globular clusters with MUSE integral-field spectrograph. In combination dedicated algorithm for source deblending, provides unique multiplex capabilities in crowded stellar fields and allows us to acquire samples up 20 000 stars within half-light radius each cluster. The present paper focuses on analysis internal dynamics 22 out clusters, using about 500 spectra 200 individual stars. Thanks large per cluster,...
We present the design, rationale, properties, and catalogues of MusE Gas FLOw Wind survey (MEGAFLOW) cool gaseous halos z≃1.0 galaxies, using low-ionisation absorption systems. The consists 22 quasar fields selected from Sloan Digital Sky Survey (SDSS), including multiple (≥3) strong lines over redshift range $0.3<z<1.5$. Each was observed with Multi-Unit Spectroscopic Explorer (MUSE) Ultraviolet Visual Echelle Spectrograph (UVES), for a total 85 hours 63 hours, respectively. UVES data...
The Nearby Supernova Factory (<i>Snfactory</i>) is an international experiment designed to lay the foundation for next generation of cosmology experiments (such as <i>CFHTLS</i>, <i>w</i>P, <i>SNAP</i> and <i>LSST</i>) which will measure expansion history Universe using Type Ia supernovae. <i>Snfactory</i> discover obtain frequent lightcurve spectrophotometry covering 3200-10000Å roughly 300 supernovae at low-redshift end smooth Hubble flow. quantity, quality, breadth galactic...
Following our study on the incidence, morphology and kinematics of ionised gas in early-type galaxies we now address question what is powering observed nebular emission. To constrain likely sources excitation, resort to a variety ancillary data, draw from complementary information kinematics, stellar populations galactic potential SAURON use SAURON-specific diagnostic diagram juxtaposing [OIII]/Hb [NI]/Hb line ratios. We find tight correlation between surface brightness flux Hb recombination...
We present observations of the stellar and gas kinematics for a representative sample 24 Sa galaxies obtained with our custom-built integral-field spectrograph SAURON operating on William Herschel Telescope. The data have been homogeneously reduced analysed by means dedicated pipeline. All resulting cubes were spatially binned to minimum mean signal-to-noise ratio 60 per spatial spectral resolution element. Our maps typically cover bulge-dominated region. find significant fraction...
We analysed two-dimensional maps of 48 early-type galaxies obtained with the SAURON and OASIS integral-field spectrographs using kinemetry, a generalization surface photometry to higher order moments line-of-sight velocity distribution (LOSVD). The include: reconstructed image, mean velocity, dispersion, h3 h4 Gauss–Hermite moments. Kinemetry is good method recognize structures otherwise missed by photometry, such as embedded discs kinematic subcomponents. In sample, we find that 31 per cent...
We present high spatial resolution integral-field spectroscopy of 28 elliptical (E) and lenticular (S0) galaxies from the SAURON representative survey obtained with OASIS spectrograph during its operation at CFHT. These seeing-limited observations explore central 8"x10" (typically one kiloparsec diameter) regions these using a sampling four times higher than (0.27" vs. 0.94" elements), resulting in almost factor two improvement median PSF. data allow accurate study to complement large-scale...
We report the detection of extended Lyα emission around individual star-forming galaxies at redshifts z = 3−6 in an ultradeep exposure Hubble Deep Field South obtained with MUSE on ESO-VLT. The data reach a limiting surface brightness (1σ) ~1 × 10-19 erg s-1 cm-2 arcsec-2 azimuthally averaged radial profiles, order magnitude improvement over previous narrowband imaging. Our sample consists 26 spectroscopically confirmed Lyα-emitting, but mostly continuum-faint (mAB ≳ 27) galaxies. In most...