A5009829679- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Particle accelerators and beam dynamics
- Scientific Research and Discoveries
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Aging, Elder Care, and Social Issues
- Ship Hydrodynamics and Maneuverability
- Historical Art and Architecture Studies
- Fluid Dynamics Simulations and Interactions
- Space Exploration and Technology
- Iterative Learning Control Systems
- Astrophysics and Cosmic Phenomena
- Historical and Architectural Studies
- Geological and Geophysical Studies
Observatoire de la Côte d’Azur
2016-2023
Université Côte d'Azur
2016-2023
Centre National de la Recherche Scientifique
2016-2023
Instituto de Astrofísica de Canarias
2006-2021
Max Planck Institute for Astronomy
2018
Max Planck Society
2018
Lagrange Laboratory
2017
University of Edinburgh
2010-2016
Royal Observatory
2010-2016
Shanghai Astronomical Observatory
2016
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
We present an analysis of the large-scale structure halo Andromeda galaxy, based on Pan-Andromeda Archeological Survey (PAndAS), currently most complete map resolved stellar populations in any galactic halo. Despite presence copious substructures, global follow closely power-law profiles that become steeper with increasing metallicity. divide sample into stream-like and a smooth component (defined as population cannot be spatially distinct substructures PAndAS). Fitting three-dimensional...
We present the discovery of three new Milky Way satellites from our search for compact stellar overdensities in photometric catalog Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS 1, or PS1) 3pi survey. The first satellite, Laevens 3, is located at a heliocentric distance d=67+/-3 kpc. With total magnitude Mv=-4.4+/-0.3 half-light radius rh=7+/-2 pc, its properties resemble those outer halo globular clusters. second system, Draco II/Laevens 4 (Dra II), closer fainter...
We present the Pristine survey, a new narrow-band photometric survey focused on metallicity-sensitive Ca H & K lines and conducted in northern hemisphere with wide-field imager MegaCam Canada-France-Hawaii Telescope (CFHT). This paper reviews our overall strategy discusses data processing metallicity calibration. Additionally we review application of these to main aims which are gather large sample most metal-poor stars Galaxy, further characterise faintest Milky Way satellites, map...
WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for William Herschel Telescope, will see first light in late 2022. WEAVE comprises a 2-degree field-of-view prime-focus corrector system, nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and single large IFU. These systems feed dual-beam spectrograph covering wavelength range 366$-$959\,nm at $R\sim5000$, or two shorter ranges $R\sim20\,000$. After summarising...
We use deep HST/ACS observations to calculate the star formation history (SFH) of Cetus dwarf spheroidal (dSph) galaxy. Our photometry reaches below oldest main-sequence turnoffs, which allows us estimate age and duration main episode in Cetus. This is well approximated by a single that peaked roughly 12 ± 0.5 Gyr ago lasted no longer than about 1.9 (FWHM). solution also suggests essentially stars formed during past 8 Gyr. makes Cetus' SFH comparable Milky Way dSphs. Given current isolation...
We present the discovery of a faint Milky Way satellite, Laevens 2/Triangulum II, found in Panoramic Survey Telescope And Rapid Response System 3π imaging data and confirmed with follow-up wide-field photometry from Large Binocular Cameras. The stellar system, an absolute magnitude MV = −1.8 ± 0.5, heliocentric distance , half-mass–radius shows remarkable similarity to faint, nearby, small satellites such as Willman 1, Segue 2, Boötes II. II further populates region parameter space for which...
The Pan-Andromeda Archaeological Survey is a survey of $>400$ square degrees centered on the Andromeda (M31) and Triangulum (M33) galaxies that has provided most extensive panorama $L_\star$ galaxy group to large projected galactocentric radii. Here, we collate summarise current status our knowledge substructures in stellar halo M31, discuss connections between these features. We estimate 13 distinctive were produced by at least 5 different accretion events, all last 3 or 4 Gyrs. suggest few...
RR Lyrae stars may be the best practical tracers of Galactic halo (sub-)structure and kinematics. The PanSTARRS1 (PS1) $3\pi$ survey offers multi-band, multi-epoch, precise photometry across much sky, but a robust identification in this data set poses challenge, given PS1's sparse, asynchronous multi-band light curves ($\lesssim 12$ epochs each five bands, taken over 4.5-year period). We present novel template fitting technique that uses well-defined physically motivated stars, demonstrate...
We discuss how knowledge of the whole evolutionary history dwarf galaxies, including details on early star formation events, can provide insight origin different galaxy types. suggest that these types may be imprinted by conditions rather than being only result a recent morphological transformation driven environmental effects. present precise histories sample Local Group derived from colour-magnitude diagrams reaching oldest main-sequence turnoffs. argue galaxies assigned to two basic...
We present an analysis of the star formation history (SFH) transition-type (dIrr/dSph) Local Group galaxy \objectname[]{LGS-3} (Pisces) based on deep photometry obtained with {\it Advanced Camera for Surveys} onboard Hubble Space Telescope}. Our shows that SFH is dominated by a main episode $\sim 11.7$ Gyr ago duration $\sim$ 1.4 which formed 90%$ stars. Subsequently, continued forming stars until present, although at much lower rate. The lack early chemical enrichment in contrast to...
We present a panoramic map of the entire Milky Way halo north |$\delta \sim -30{^\circ }$| (∼30 000 deg2), constructed by applying matched-filter technique to Pan-STARRS1 3π Survey data set. Using single-epoch photometry reaching g ∼22, we are sensitive stellar substructures with heliocentric distances between 3.5 and ∼35 kpc. recover almost all previously reported streams in this volume demonstrate that several these significantly more extended than earlier sets have indicated. In addition,...
We present a detailed study of the star formation history (SFH) Tucana dwarf spheroidal galaxy. High quality, deep HST/ACS data, allowed us to obtain deepest color-magnitude diagram date, reaching old main sequence turnoff (F814 ~ 29) with good photometric accuracy. Our analysis, based on three different SFH codes, shows that is an and metal-poor stellar system, which experienced strong initial burst at very early epoch (~ 13 Gyr ago) lasted maximum 1 (sigma value). are not able...
We present a new satellite in the outer halo of Galaxy, first Milky Way found stacked photometric catalog Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1) Survey. From follow-up photometry obtained with WFI on MPG/ESO 2.2m telescope, we argue that object, located at heliocentric distance 145+/-17 kpc, is most distant globular cluster yet known. With total magnitude M_V=-4.3+/-0.2 half-light radius 20+/-2 pc, it shares properties extended clusters our Galaxy Andromeda...
We present a detailed kinematic analysis of the outer halo globular cluster (GC) system M31. Our basis for this is set new spectroscopic observations 78 clusters lying at projected distances between Rproj ~20-140 kpc from M31 centre. These are largely drawn recent PAndAS catalogue; 63 our targets have no previous velocity data. Via Bayesian maximum likelihood we find that GCs with > 30 exhibit coherent rotation around minor optical axis M31, in same direction as more centrally- located GCs,...
The Canada-France Imaging Survey (CFIS) will map the northern high Galactic latitude sky in $u$-band ("CFIS-u", 10,000$\, {\rm deg^2}$) and $r$-band ("CFIS-r", 5,000$\, deg^2}$), enabling a host of stand-alone science investigations, providing some ground-based data necessary for photometric redshift determination Euclid mission. In this first contribution we present component survey, describe observational strategy, discuss highlight results, based on approximately one third final area. We...
We report the discovery of two new dwarf galaxies, Lacerta I/Andromeda XXXI (Lac I/And XXXI) and Cassiopeia III/Andromeda XXXII (Cas III/And XXXII), in stacked Pan-STARRS1 r_P1- i_P1-band imaging data. Both are luminous systems (M_V ~ -12) located at projected distances 20.3° 10.5° from M31. Lac I Cas III likely satellites Andromeda galaxy with heliocentric 756^{+44}_{-28} kpc 772^{+61}_{-56} kpc, respectively, corresponding M31-centric 275+/-7 144^{+6}_{-4} . The brightest recent Local...
While wide-field surveys of M31 have revealed much substructure at large radii, understanding the nature and origin this material is not straightforward from morphology alone. Using deep HST/ACS data, we derived further constraints in form quantitative star formation histories (SFHs) for 14 inner halo fields which sample diverse substructures. In agreement with our previous analysis colour-magnitude diagram morphologies, find resultant behaviours can be broadly separated into two categories....
We present the first kinematic analysis of far outer halo globular cluster (GC) population in Local Group galaxy M31. Our sample contains 53 objects with projected radii ~20-130 kpc, which 44 have no previous spectroscopic information. GCs >30 kpc are found to exhibit net rotation around minor axis M31, same sense as inner GCs, albeit a smaller amplitude 79 +/-19 km/s. The rotation-corrected velocity dispersion full GC is 106 +/-12 km/s, we observe decrease increasing radius. find compelling...
ABSTRACT We present a comprehensive analysis of the structural properties and luminosities 23 dwarf spheroidal galaxies that fall within footprint Pan-Andromeda Archaeological Survey (PAndAS). These represent large majority Andromeda’s known satellite cover wide range in luminosity ( <?CDATA $-11.6\lesssim {M}_{V}\lesssim -5.8$?> or ${10}^{4.2}\lesssim L\lesssim {10}^{6.5}\,{L}_{\odot }$?> ) surface brightness $25.1\lesssim {\mu }_{0}\lesssim 29.3$?> mag arcsec −2 ). confirm most previous...
Despite the huge amount of photometric and spectroscopic efforts targetting Galactic bulge over past few years, its age distribution remains controversial owing to both complexity determining individual stars difficult observing conditions. Taking advantage recent release very deep, proper-motion-cleaned colour--magnitude diagrams (CMDs) four low reddening windows obtained with Hubble Space Telescope (HST), we used CMD-fitting technique calculate star formation history (SFH) at -2deg > b...
ABSTRACT We use the SMASH survey to obtain unprecedented deep photometry reaching down oldest main-sequence turn-offs in colour–magnitude diagrams (CMDs) of Small Magellanic Cloud (SMC) and quantitatively derive its star formation history (SFH) using CMD fitting techniques. identify five distinctive peaks last 3.5 Gyr, at ∼3, ∼2, ∼1.1, ∼0.45 Gyr ago, one presently. compare these SFH Large (LMC), finding unequivocal synchronicity, with both galaxies displaying similar periods enhanced over...