A5087074418- 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
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- Radio Astronomy Observations and Technology
- Plant Water Relations and Carbon Dynamics
- Photocathodes and Microchannel Plates
- Phase Equilibria and Thermodynamics
- Veterinary Equine Medical Research
- Dark Matter and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Mathematics and Applications
- Optical Coatings and Gratings
- Computational Physics and Python Applications
- Particle accelerators and beam dynamics
- Advanced Mathematical Theories and Applications
Aix-Marseille Université
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Laboratoire d’Astrophysique de Marseille
2015-2024
Canada–France–Hawaii Telescope
2022-2024
Gemini North Observatory
2023
Université Toulouse III - Paul Sabatier
2010-2021
Institut de Recherche en Astrophysique et Planétologie
2010-2021
Université de Toulouse
2009-2021
Trinity House
2014
Roche (France)
2011
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...
Disk galaxies at high redshift (z~2) are characterized by fractions of cold gas, strong turbulence, and giant star-forming clumps. Major mergers disk should then generally involve such turbulent clumpy disks. Merger simulations, however, model the ISM as a stable, homogeneous, thermally pressurized medium. We present first merger simulations with cold, turbulent, gas. discuss major new features these models compared to where gas is artificially stabilized warmed. Gas which already in...
The Vela supernova remnant (SNR) is a complex region containing number of sources non-thermal radiation. inner section this SNR, within 2 degrees the pulsar PSR B0833-45, has been observed by HESS γ-ray atmospheric Cherenkov detector in 2004 and 2005. A strong signal seen from an extended to south pulsar, integration radius around position (, J2000.0). excess coincides with hard X-ray emission ROSAT ASCA satellites. energy spectrum source between 550 GeV 65 TeV well fit power law function...
[Abridged] Due to their large distances, high-z galaxies are observed at a very low spatial resolution. In order disentangle the evolution of galaxy kinematics from resolution effects, we have used Fabry-Perot 3D Ha data-cubes 153 nearby isolated GHASP survey simulate z=1.7. We show that inner velocity gradient is lowered and responsible for peak in dispersion map. Toy-models rotating disks been built recover parameters data. The poor makes kinematical inclination uncertain center difficult...
Star-forming disk galaxies at high redshift are often subject to violent instability, characterized by giant clumps whose fate is yet be understood. The main question whether the disrupt within their dynamical timescale (<50Myr), like molecular clouds in today's galaxies, or they survive stellar feedback for more than a orbital time (~300Myr) which case can migrate inward and help building central bulge. We present 3.5-7pc resolution AMR simulations of high-redshift disks including...
Context. Identifying the main processes of galaxy assembly at high redshifts is still a major issue to understand formation and evolution early epochs in history Universe. Aims. This work aims provide first insight into dynamics mass galaxies 1.2<z<1.6, epoch just before sharp decrease cosmic star rate. Methods. We use near-infrared integral field spectrograph SINFONI on ESO-VLT under 0.65 seeing obtain spatially resolved spectroscopy nine emission line with 1.2<z<1.6 from VIMOS VLT Deep...
We aim at addressing the questions related to galaxy mass assembly through major and minor wet merging processes in redshift range 1<z<2. A consequent fraction of Milky Way like galaxies are thought have undergone an unstable clumpy phase this early stage. Using adaptive mesh refinement code RAMSES, with a recent physically-motivated implementation stellar feedback, we build Merging Isolated high-Redshift Adaptive Galaxies (MIRAGE) sample. It is composed 20 mergers 3 isolated idealized disks...
We use a background quasar to detect the presence of circum-galactic gas around $z=0.91$ low-mass star forming galaxy. Data from new Multi Unit Spectroscopic Explorer (MUSE) on VLT show that host galaxy has dust-corrected star-formation rate (SFR) 4.7$\pm$0.2 Msun/yr, with no companion down 0.22 Msun/yr (5 $\sigma$) within 240 kpc (30"). Using high-resolution spectrum (UVES) quasar, which is fortuitously aligned major axis (with an azimuth angle $\alpha$ only $15^\circ$), we find, in...
We present the second data release of MUSE Hubble UDF surveys, which includes deepest spectroscopic survey ever performed. The data, with their 3D content, amazing depth, wide spectral range, and excellent spatial medium resolution, are rich in information. This update first incorporates a new 141-hour adaptive-optics-assisted MXDF field (1' diameter FoV) addition to reprocessed 10-hour mosaic (3'x3') single 31-hour deep (1'x1'). have securely identified measured redshift 2221 sources, an...
Quaoar is a classical Trans-Neptunian Object (TNO) with an area equivalent diameter of 1,100 km and orbital semi-major axis 43.3 astronomical units. Based on stellar occultations observed between 2018 2021, inhomogeneous ring (Q1R, Quaoar's first ring) was detected around this body. Aims. A new occultation by August 9th, 2022 aiming to improve shape models the physical parameters Q1R while searching for additional material Methods. The provided nine effective chords across Quaoar, pinning...
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...
We present a MUSE and KMOS dynamical study 405 star-forming galaxies at redshift z=0.28-1.65 (median z=0.84). Our sample are representative of star-forming, main-sequence galaxies, with star-formation rates SFR=0.1-30Mo/yr stellar masses M=10^8-10^11Mo. For 49+/-4% our sample, the dynamics suggest rotational support, 24+/-3% unresolved systems 5+/-2% appear to be early-stage major mergers components on 8-30kpc scales. The remaining 22+/-5% dynamically complex, irregular (or face-on systems)....
Aims. Whereas the evolution of gas kinematics massive galaxies is now relatively well established up to redshift z ~ 3, little known about lower mass (M⋆≤ 1010M⊙) galaxies. We use MUSE, a powerful wide-field, optical integral-field spectrograph (IFS) recently mounted on VLT, characterize this galaxy population at intermediate redshift.
We provide, for the first time, robust observational constraints on galaxy major merger fraction up to $z\approx 6$ using spectroscopic close pair counts. Deep Multi Unit Spectroscopic Explorer (MUSE) observations in Hubble Ultra Field (HUDF) and South (HDF-S) are used identify 113 secure pairs of galaxies among a parent sample 1801 spread over large redshift range ($0.2<z<6$) stellar masses ($10^7-10^{11} M_\odot$), thus probing about 12 Gyr evolution. Stellar estimated from spectral energy...
We present spatially resolved stellar kinematic maps, for the first time, a sample of 17 intermediate redshift galaxies (0.2 < z 0.8). used deep MUSE/VLT integral field spectroscopic observations in Hubble Deep Field South (HDFS) and Ultra (HUDF), resulting from ~30h integration time per field, each covering 1'x1' view, with ~0.65" spatial resolution. selected all brighter than 25mag I band which continuum is detected over an area that at least two times larger The contains mostly late-type...
Galaxies at low-redshift typically possess negative gas-phase metallicity gradients (centres more metal-rich than their outskirts). Whereas, it is not uncommon to observe positive in higher-redshift galaxies ($z \gtrsim 0.6$). Bridging these epochs, we present of 84 star-forming between $0.08 < z 0.84$. Using the with reliably determined gradients, measure median gradient be ($-0.039^{+0.007}_{-0.009}$ dex/kpc). Underlying this, however, significant scatter: $(8\pm3)\%\ [7]$ have...
Understanding how galaxies evolve and assemble their mass across cosmic time is still a fundamental unsolved issue. To get insight into the various processes of galaxy assembly, Mass Assembly Survey with SINFONI in VVDS (MASSIV) aims at probing kinematical chemical properties significant representative sample high-redshift (0.9 < z 1.8) star-forming galaxies. This paper presents selection function, observing strategy global MASSIV sample. contains 84 galaxies, selected from VIMOS VLT Deep...
We aim to measure the major merger rate of star-forming galaxies at 0.9 < z <1.8, using close pairs identified from integral field spectroscopy (IFS). use velocity maps obtained with SINFONI/VLT on MASSIV sample, selected population in VVDS. identify physical measurement relative and projected separation (r_p) pair. Using well constrained selection function sample we derive gas-rich fraction (luminosity ratio mu = L_2/L_1 >= 1/4), and, time scales cosmological simulations, a mean redshift up...