R. Bacon's research while affiliated with French National Centre for Scientific Research and other places
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Publications (171)
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation VLT panoramic integral-field spectrograph currently in manufacturing, assembly and integration phase. MUSE has a field of 1x1 arcmin2 sampled at 0.2x0.2 arcsec2 and is assisted by the VLT ground layer adaptive optics ESO facility using four laser guide stars. The instrument is a la...
We present the second data release of the MUSE Hubble Ultra-Deep Field surveys, which includes the deepest spectroscopic survey ever performed. The MUSE data, with their 3D content, amazing depth, wide spectral range, and excellent spatial and medium spectral resolution, are rich in information. Their location in the Hubble ultra-deep field area, w...
Aims. We present the Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) selected from MUSE and HST observations of 17 lensing clusters. The sample consists of 603 continuum-faint (−23 < M UV < −14) lensed Lyman- α emitters (producing 959 images) with secure spectroscopic redshifts between 2.9 and 6.7. Combining the power of cluster magnification with 3D...
We present the Lensed Lyman-Alpha MUSE Arcs Sample (LLAMAS) selected from MUSE and HST observations of 17 lensing clusters. The sample consists of 603 continuum-faint (-23<M_UV<-14) lensed Lyman-alpha emitters (producing 959 images) with spectroscopic redshifts between 2.9 and 6.7. Combining the power of cluster magnification with 3D spectroscopic...
[Abbreviated] Rest-frame UV emission lines probe physical parameters of the emitting star-forming galaxies and their environments. The strongest main UV line, Ly$\alpha$, has been instrumental in advancing the general knowledge of galaxy formation in the early universe. However, observing Ly$\alpha$ emission becomes increasingly challenging at $z \...
Rest-frame ultraviolet (UV) emission lines probe electron densities, gas-phase abundances, metallicities, and ionization parameters of the emitting star-forming galaxies and their environments. The strongest main UV emission line, Ly α , has been instrumental in advancing the general knowledge of galaxy formation in the early universe. However, obs...
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We report the discovery of diffuse extended Ly α emission from redshift 3.1 to 4.5, tracing cosmic web filaments on scales of 2.5−4 cMpc. These structures have been observed in overdensities of Ly α emitters in the MUSE Extremely Deep Field, a 140 h deep MUSE observation located in the Hubble Ultra-Deep Field. Among the 22 overdense regions identif...
Here we describe a simple, efficient, and most importantly fully operational point-spread-function(PSF)-reconstruction approach for laser-assisted ground layer adaptive optics (GLAO) in the frame of the Multi Unit Spectroscopic Explorer (MUSE) Wide Field Mode. Based on clear astrophysical requirements derived by the MUSE team and using the function...
Context. Here we describe a simple, efficient, and most importantly fully operational point-spread-function (PSF)-reconstruction approach for laser-assisted ground layer adaptive optics (GLAO) in the frame of the Multi Unit Spectroscopic Explorer (MUSE) wide field mode.
Aims. Based on clear astrophysical requirements derived by the MUSE team and us...
![Fig. 3. Hα/[NII] image of the zoomed-in white square in Fig. 1. Again,...](profile/Ana_Monreal_Ibero/publication/337288945/figure/fig2/AS:958774185570308@1605600987937/Ha-NII-image-of-the-zoomed-in-white-square-in-Fig-1-Again-I-band-contour-levels-are_Q320.jpg)
Aims. NGC 6240 is a well-studied nearby galaxy system in the process of merging. Based on optical, X-ray, and radio observations, it is thought to harbor two active nuclei. We carried out a detailed optical 3D spectroscopic study to investigate the inner region of this system in connection with existing MERLIN and VLBA data.
Methods. We observed NG...
We present an analysis of ${\rm H\,\rm{\small {I}}}$ Lyman $\alpha$ emission in deep VLT/MUSE observations of two highly magnified and extended galaxies at $z=3.5$ and 4.03, including a newly discovered, almost complete Einstein ring. While these Lyman $\alpha$ haloes are intrinsically similar to the ones typically seen in other MUSE deep fields, t...
![Fig. 3. Hα/[NII] image of the zoomed in white square in Figs. 1. Again,...](profile/Martin-Ochmann-3/publication/336869302/figure/fig3/AS:819182979530753@1572319850153/Ha-NII-image-of-the-zoomed-in-white-square-in-Figs-1-Again-I-band-contour-levels-are_Q320.jpg)
NGC6240 is a well studied nearby galaxy system in the process of merging. It has been claimed to harbor two active nuclei based on optical, X-ray and radio observations. We carried out a detailed optical 3D spectroscopic study to investigate the inner region of this system in connection with existing MERLIN/VLBA data. We observed NGC6240 with very...
Newly forming protoplanets are expected to create cavities and substructures in young, gas-rich protoplanetary disks1–3, but they are difficult to detect as they could be confused with disk features affected by advanced image analysis techniques4,5. Recently, a planet was discovered inside the gap of the transitional disk of the T Tauri star PDS 70...
Context. Adaptive optics (AO) systems greatly increase the resolution of large telescopes, but produce complex point spread function (PSF) shapes, varying in time and across the field of view. The PSF must be accurately known since it provides crucial information about optical systems for design, characterization, diagnostics, and image post-proces...
Newly forming proto-planets are expected to create cavities and substructures in young, gas-rich proto-planetary disks, but they are difficult to detect as they could be confused with disk features affected by advanced image-analysis techniques. Recently, a planet was discovered inside the gap of the transitional disk of the T-Tauri star PDS 70. He...
We present the MUSE-Wide survey, a blind, 3D spectroscopic survey in the CANDELS/GOODS-S and CANDELS/COSMOS regions. The final survey will cover 100 × 1 arcmin ² MUSE fields. Each MUSE-Wide pointing has a depth of one hour and hence targets more extreme and more luminous objects over ten times the area of the MUSE-Deep fields. The legacy value of M...
We present the MUSE-Wide survey, a blind, 3D spectroscopic survey in the CANDELS/GOODS-S and CANDELS/COSMOS regions. Each MUSE-Wide pointing has a depth of 1 hour and hence targets more extreme and more luminous objects over 10 times the area of the MUSE-Deep fields (Bacon et al. 2017). The legacy value of MUSE-Wide lies in providing "spectroscopy...
Change history: In this Letter, author M. Akhlaghi should be associated with affiliation (2) rather than (3). This error has been corrected online.
Galaxies are surrounded by large reservoirs of gas, mostly hydrogen, fed by inflows from the intergalactic medium and by outflows due to galactic winds. Absorption-line measurements along the sightlines to bright and rare background quasars indicate that this circumgalactic medium pervades far beyond the extent of starlight in galaxies, but very li...
Aims. As a new approach to the study of resolved stellar populations in nearby galaxies, our goal is to demonstrate in NGC300 that integral field spectroscopy with high spatial resolution and excellent seeing conditions reaches an unprecedented depth in severely crowded fields. Methods. MUSE observations with seven pointings in NGC300 have resulted...
The Lyman alpha (lya) line of Hydrogen is a prominent feature in the spectra of star-forming galaxies, usually redshifted by a few hundreds of km/s compared to the systemic redshift. This large offset hampers follow-up surveys, galaxy pair statistics and correlations with quasar absorption lines when only lya is available. We propose diagnostics th...
We present the deepest study to date of the Lya luminosity function (LF) in a blank field using blind integral field spectroscopy from MUSE. We constructed a sample of 604 Lya emitters (LAEs) across the redshift range 2.91 < z < 6.64 using automatic detection software in the Hubble Ultra Deep Field. We calculate accurate total Lya fluxes capturing...
We present a clustering analysis of a sample of 238 Ly α emitters at redshift 3 ≲ z ≲ 6 from the MUSE-Wide survey. This survey mosaics extragalactic legacy fields with 1h MUSE pointings to detect statistically relevant samples of emission line galaxies.We analysed the first year observations from MUSE-Wide making use of the clustering signal in the...
We provide, for the first time, robust observational constraints on the galaxy major merger fraction up to $z\approx 6$ using spectroscopic close pair counts. Deep Multi Unit Spectroscopic Explorer (MUSE) observations in the Hubble Ultra Deep Field (HUDF) and Hubble Deep Field South (HDF-S) are used to identify 113 secure close pairs of galaxies am...
We tested the performance of photometric redshifts for galaxies in the Hubble Ultra Deep field down to 30th magnitude. We compared photometric redshift estimates from three spectral fitting codes from the literature (EAZY, BPZ and BEAGLE) to high quality redshifts for 1227 galaxies from the MUSE integral field spectrograph. All these codes can retu...
![Fig. 4. Line fluxes of [O ii] λλ3726, 3729 (the red circles), C iii]...](profile/Laurence-Tresse/publication/320344743/figure/fig3/AS:669069007134755@1536529890890/Line-fluxes-of-O-ii-ll3726-3729-the-red-circles-C-iii-ll1907-1909-the-blue_Q320.jpg)
We have conducted a two-layered spectroscopic survey (1'x1' ultra deep and 3'x3' deep regions) in the Hubble Ultra Deep Field (HUDF) with the Multi Unit Spectroscopic Explorer (MUSE). The combination of a large field of view, high sensitivity, and wide wavelength coverage provides an order of magnitude improvement in spectroscopically confirmed red...
We present a clustering analysis of a sample of 238 Ly{$\alpha$}-emitters at redshift 3<z<6 from the MUSE-Wide survey. This survey mosaics extragalactic legacy fields with 1h MUSE pointings to detect statistically relevant samples of emission line galaxies. We analysed the first year observations from MUSE-Wide making use of the clustering signal i...
We present an analysis of MUSE observations obtained on the massive Frontier Fields cluster Abell 2744. This new dataset covers the entire multiply-imaged region around the cluster core. We measure spectroscopic redshifts for HST-selected continuum sources together with line emitters blindly detected in the datacube. The combined catalog consists o...
We use a background quasar to detect the presence of circumgalactic gas around a z = 0.91 low-mass star-forming galaxy. Data from the new Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope show that the galaxy has a dust-corrected star formation rate (SFR) of 4.7 ± 2.0 M⊙ yr-1, with no companion down to 0.22 M⊙ yr-1 (5σ) within 24...
We present the results obtained with MUSE on the core of the lensing cluster A1689. Integral-field observations with MUSE provide a unique view of the central region, allowing us to conduct a complete census on both cluster galaxies and lensed background sources, identified based on their spectral features without preselection. We investigate the m...
We report the detection of extended Ly alpha emission around individual star-forming galaxies at redshifts z = 3-6 in an ultradeep exposure of the Hubble Deep Field South obtained with MUSE on the ESO-VLT. The data reach a limiting surface brightness (1sigma) of ~1 x 10^-19 erg s^-1 cm^-2 arcsec^-2 in azimuthally averaged radial profiles, an order...
(Abridged) We make use of the deepest VLT/MUSE observations performed so far
on the Hubble Deep Field South (HDFS) to characterize the low-mass (<
$10^{10}$M$_\odot$) galaxy population at intermediate redshift. We identify a
sample of 28 spatially-resolved emission-line galaxies in the deep (27h
integration time) MUSE data cube, spread over a redsh...
We report the detection of extended Ly alpha emission around individual
star-forming galaxies at redshifts z = 3-6 in an ultradeep exposure of the
Hubble Deep Field South obtained with MUSE on the ESO-VLT. The data reach a
limiting surface brightness (1sigma) of ~1 x 10^-19 erg s^-1 cm^-2 arcsec^-2 in
azimuthally averaged radial profiles, an order...
We observed the Hubble Deep Field South with the new panoramic integral field
spectrograph MUSE that we built and just commissioned at the VLT. The data cube
resulting from 27 hours of integration covers one arcmin^2 field of view at an
unprecedented depth with a 1 sigma emission line surface brightness limit of
1x$10^{-19}$ erg/s/cm$^2$/arcsec$^2$...
MUSE (Multi Unit Spectroscopic Explorer) is a second generation instrument, built for ESO (European Southern Observatory) and dedicated to the VLT (Very Large Telescope). This instrument is an innovative integral field spectrograph (1x1 arcmin 2 Field of View), operating in the visible wavelength range, from 465 nm to 930 nm. The MUSE project is su...
MUSE (Multi Unit Spectroscopic Explorer) is a second generation instrument built for ESO (European Southern Observatory). The MUSE project is supported by a European consortium of 7 institutes. After the finalisation of its integration in Europe, the MUSE instrument has been partially dismounted and shipped to the VLT (Very Large Telescope) in Chil...
MUSE, the Multi Unit Spectroscopic Explorer, is a 2nd generation
integral-field spectrograph under final assembly to see first light at the Very
Large Telescope in 2013. By capturing ~ 90000 optical spectra in a single
exposure, MUSE represents a challenge for data reduction and analysis. We
summarise here the main features of the Data Reduction Sy...
MUSE (Multi Unit Spectroscopic Explorer) is a second generation VLT
panoramic integral field spectrograph developed for the European
Southern Observatory (ESO), operating in the visible wavelength range
(0.465-0.93 μm). The MUSE instrument is currently under
integration and the commissioning is expected to start at the beginning
of year 2013. T...
Optical coatings are one of the key elements of the VLT’s second
generation instrument MUSE. The Multi Unit Spectroscopic Explorer is
developed for the European Southern Observatory (ESO) and will be
installed in 2013 at the VLT (Very Large Telescope). MUSE is a panoramic
integral field spectrograph (1x1arcmin² Field of View) operating in
the visib...
MUSE (Multi Unit Spectroscopic Explorer) is an integral-field
spectrograph which will be mounted on the Very Large Telescope (VLT).
MUSE is being built for ESO by a European consortium under the
supervision of the Centre de Recherche Astrophysique de Lyon (CRAL). In
this context, CRAL is responsible for the development of dedicated
software to help...
The ATLAS3D sample includes all nearby ETGs observable fr
northern Earth hemisphere, and for this reason we hope its homogeneous
data set will ultimately constitute a legacy for future studies. We
trust that our and other groups will exploit our data and sample well
beyond what we had originally envisioned. Our first steps in the
directions outline...
We propose a simple model for the origin of fast and slow rotator early-type galaxies (ETG) within the hierarchical Λcold dark matter (ΛCDM) scenario, that is based on the assumption that the mass fraction of stellar discs in ETGs is a proxy for the specific angular momentum expressed via λR. Within our model we reproduce the fraction of fast and s...
The second generation instrument MUSE for the VLT has been designed to
profit of the ESO Adaptive Optics Facility (AOF). The two Adaptive
Optics (AO) modes (GLAO in Wide Field Mode [WFM] and LTAO in Narrow
Field Mode [NFM]) will be used. To achieve its key science goals, MUSE
will require information on the full system (Atmosphere, AO, telescope
an...
The HARMONI integral field spectrograph concept is one of the two
instruments chosen to form the first-light instrument complement at the
E-ELT. HARMONI is a work-horse instrument, operating over a large
wavelength range (V to K), with many different spatial scales
(diffraction limited to seeing limited) and moderate to high spectral
resolving powe...
[Abridged] We present ground-based MDM V-band and Spitzer/IRAC 3.6um-band
photometric observations of the 72 representative galaxies of the SAURON
Survey. In combination with the SAURON stellar velocity dispersion measured
within an effective radius (se), this allows us to explore the location of our
galaxies in the main scaling relations. We inves...
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation integral-field spectrograph currently in development for the Very Large Telescope (VLT), consisting of 24 Integral Field Units (IFU). This paper presents the methodology for sky subtraction to be used in the MUSE data reduction pipeline. The method is based on the parameterized sim...
The Atlas3D project is a multi-wavelength survey combined with a theoretical
modeling effort. The observations span from the radio to the millimeter and
optical, and provide multi-colour imaging, two-dimensional kinematics of the
atomic (HI), molecular (CO) and ionized gas (Hbeta, [OIII] and [NI]), together
with the kinematics and population of the...
We report recent results from the photometric follow-up study we are conducting in the context of the SAURON project. We use ground-based MDM V -band and Spitzer/IRAC 3.6 mum imaging to characterise our sample of E, S0 and Sa galaxies photometrically. Combined with SAURON integral-field spectroscopic observations, this information allows us to expl...
In this proceeding we look at the relationship between the photometric nuclear properties of early-type galaxies from Hubble
Space Telescope imaging and their overall kinematics as observed with the SAURON integral-field spectrograph. We compare the inner slope of their photometric profiles and the Slow/Fast rotator classes,
defined by the amplitud...
MUSE (Multi Unit Spectroscopic Explorer) is a second generation instrument developed for ESO (European Southern Observatory) and will be assembled to the VLT (Very Large Telescope) in 2012. The MUSE instrument can simultaneously record 90.000 spectra in the visible wavelength range (465-930nm), across a 1*1arcmin2 field of view, thanks to 24 identi...
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation VLT panoramic integral-field spectrograph currently in manufacturing, assembly and integration phase. MUSE has a field of 1x1 arcmin2 sampled at 0.2x0.2 arcsec2 and is assisted by the VLT ground layer adaptive optics ESO facility using four laser guide stars. The instrument is a la...
MUSE (Multi Unit Spectroscopic Explorer) is a second generation instrument developed for ESO (European Southern Observatory) to be installed on the VLT (Very Large Telescope) in year 2012. The MUSE project is supported by a European consortium of 7 institutes. After a successful Final Design Review the project is now facing a turning point which co...
MUSE (Multi Unit Spectroscopic Explorer) is a second generation instrument developed for ESO (European Southern Observatory) and will be assembled to the VLT (Very Large Telescope) in 2012. The MUSE instrument can simultaneously record 90.000 spectra in the visible wavelength range (465-930nm), across a 1*1arcmin2 field of view, thanks to 24 identi...
The Multi-Unit Spectroscopic Explorer (MUSE) is an integral-field spectrograph for the ESO Very Large Telescope. After completion of the Final Design Review in 2009, MUSE is now in its manufacture and assembly phase. To achieve a relative large field-of-view with fine spatial sampling, MUSE features 24 identical spectrograph-detector units. The acc...
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation VLT panoramic integral-field spectrograph currently in manufacturing, assembly and integration phase. MUSE has a field of 1x1 arcmin(2) sampled at 0.2x0.2 arcsec(2) and is assisted by the VLT ground layer adaptive optics ESO facility using four laser guide stars. The instrument is...
We investigate the accuracy of mass determinations M_BH of supermassive black
holes in galaxies using dynamical models of the stellar kinematics. We compare
10 of our M_BH measurements, using integral-field OASIS kinematics, to
published values. For a sample of 25 galaxies we confront our new M_BH derived
using two modeling methods on the same OASI...
We present the results of an investigation of the local escape velocity (Vesc)– line strength index relationship for 48 early-type galaxies from the SAURON sample, the first such study based on a large sample of galaxies with both detailed integral field observations and extensive dynamical modelling. Values of Vesc are computed using multi-Gaussia...
The Multi Unit Spectroscopic Explorer MUSE [MUSE public web site: http://muse.univ-lyon1.fr] is one of the second generation VLT instruments. MUSE is a wide-field optical integral field spectrograph operating in the
visible wavelength range with improved spatial resolution. The MUSE Consortium consists of groups at Lyon (PI institute, CRAL),
Gottin...
We report the first wide-field mapping of the kinematics and stellar populations in the E3 galaxy NGC 4365. The velocity maps extend previous long-slit work. They show two independent kinematic subsystems: the central 300 pc × 700 pc rotates about the projected minor axis, and the main body of the galaxy, 3 kpc × 4 kpc, rotates almost at right angl...
[Abridged] We analysed two-dimensional maps of 48 early-type galaxies obtained with the SAURON and OASIS integral-field spectrographs using kinemetry, a generalisation of surface photometry to the higher order moments of the line-of-sight velocity distribution (LOSVD). In the SAURON sample, we find that 31% of early-type galaxies are single compone...
We discuss SAURON integral field observations of a sample of 42 spirals, ranging in type from Sa to Sd. Using 2D maps of the stellar velocity, velocity dispersion, and absorption line strength, it is now much easier to understand the nature of nearby galactic bulges and inner disks. Here we briefly present some of our results.
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation instrument in development for the Very Large Telescope
(VLT) of the European Southern Observatory (ESO), due to begin operation in 2011/12. MUSE will be an extremely powerful integral-field
spectrograph fed by a new multiple-laser adaptive optics system on the VLT. In its usual ope...
Motivated by recent progress in the study of early-type galaxies owing to technological advances, the launch of new space telescopes and large ground-based surveys, we attempt a short review of our current understanding of the recent star-formation activity in such intriguing galactic systems.
In this proceeding we make use of the two-dimensional stellar kinematics of a representative sample of E and S0 galaxies obtained with the SAURON integral-field spectrograph to reveal that early-type galaxies appear in two broad flavours, depending on whether they exhibit clear large-scale rotation or not. We measure the level of rotation via a new...
In this proceeding we look at the relationship between the photometric nuclear properties of early-type galaxies from Hubble Space Telescope imaging and their overall kinematics as observed with the SAURON integral-field spectrograph. We compare the inner slope of their photometric profiles and the Slow/Fast rotator classes, defined by the amplitud...