Maximilien Franco
A5070040151- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Solar and Space Plasma Dynamics
- Superconducting and THz Device Technology
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Pulsars and Gravitational Waves Research
- Advanced Optical Sensing Technologies
- Real-time simulation and control systems
- Cosmology and Gravitation Theories
- Calibration and Measurement Techniques
- Space Exploration and Technology
- Educational Practices and Policies
Astrophysique, Instrumentation et Modélisation
2017-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2017-2024
CEA Paris-Saclay
2017-2024
The University of Texas at Austin
2023-2024
University of Hertfordshire
2019-2023
Centre National de la Recherche Scientifique
2017-2021
Délégation Paris 7
2018-2021
Sorbonne Paris Cité
2018-2021
Université Paris-Saclay
2018-2021
Université Paris Cité
2017-2021
Abstract We present an investigation into the first 500 Myr of galaxy evolution from Cosmic Evolution Early Release Science (CEERS) survey. CEERS, one 13 JWST ERS programs, targets formation z ∼ 0.5 to >10 using several imaging and spectroscopic modes. make use epoch CEERS NIRCam imaging, spanning 35.5 arcmin 2 , search for candidate galaxies at > 9. Following a detailed data reduction process implementing custom steps produce high-quality reduced images, we perform multiband...
We present a new, publicly available library of dust spectral energy distributions (SEDs). These SEDs are characterized by only three parameters: the mass (Mdust), temperature (Tdust), and mid-to-total infrared color (IR8=LIR/L8). The latter measures relative contribution PAH molecules to LIR. used this model star-forming galaxies at 0.5<z<4 in CANDELS fields, using both individual detections stacks Herschel ALMA imaging, extending sample z=0 Reference Survey. At first order, SED galaxy was...
We present a 69 arcmin$^2$ ALMA survey at 1.1mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band part of GOODS-South field. taper 0"24 original image with homogeneous and circular synthesized beam 0"60 to reduce number independent beams - thus reducing purely statistical spurious detections optimize sensitivity point sources. extract catalogue galaxies selected by identify sources without HST counterparts down 5$\sigma$ limiting depth H=28.2 AB (HST/WFC3 F160W). detects 20 brighter than 0.7...
We use high-resolution continuum images obtained at 870microns with the Atacama Large Millimeter Array (ALMA) to probe surface density of star-formation in z~2 galaxies and study different physical properties between within above main sequence galaxies. This sample eight star-forming selected among most massive Herschel GOODS-South field is supplemented eleven from public data 1.3 mm survey Hubble Ultra-Deep Field. ALMA reveals systematically dense concentrations dusty close center stellar...
Abstract We present JWST NIRSpec spectroscopy for 11 galaxy candidates with photometric redshifts of z ≃ 9 − 13 and M UV ∈ [ −21, −18] newly identified in NIRCam images the Cosmic Evolution Early Release Science Survey. confirm emission line 7 galaxies at = 7.762–8.998 using spectra ∼1–5 μ m either prism or its three medium-resolution ( R ∼ 1000) gratings. For candidates, we achieve a high confirmation rate ≃90%, which validates classical dropout selection from photometry. No robust lines...
Abstract We present the survey design, implementation, and outlook for COSMOS-Web, a 255 hr treasury program conducted by James Webb Space Telescope in its first cycle of observations. COSMOS-Web is contiguous 0.54 deg 2 NIRCam imaging four filters (F115W, F150W, F277W, F444W) that will reach 5 σ point-source depths ranging ∼27.5–28.2 mag. In parallel, we obtain 0.19 MIRI one filter (F770W) reaching ∼25.3–26.0 build on rich heritage multiwavelength observations data products available COSMOS...
Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources expected drop out bluer filters while well detected redder filters. However, here we show that dust-enshrouded star-forming galaxies lower redshifts (z<7) may also mimic near-infrared (near-IR) colors LBGs, representing potential contaminants LBG candidate samples. First, analyze...
The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate unprecedented detail nature of optical/near-IR faint, mid-IR bright sources, HST-dark galaxies among them. We gather data from CEERS survey EGS, jointly with HST data, analyze spatially resolved optical-to-mid-IR spectral energy distributions (SEDs) estimate both photometric redshifts 2 dimensions stellar populations properties a pixel-by-pixel basis. select 138 F150W-F356W>1.5 mag, F356W<27.5...
Abstract We present a comprehensive analysis of the evolution morphological and structural properties large sample galaxies at z = 3–9 using early James Webb Space Telescope (JWST) CEERS NIRCam observations. Our consists 850 > 3 detected in both Hubble (HST)/WFC3 JWST/NIRCam images, enabling comparison HST JWST morphologies. conduct set visual classifications, with each galaxy classified three times. also measure quantitative morphologies across all filters. find that have wide diversity...
Stellar bars are key drivers of secular evolution in galaxies and can be effectively studied using rest-frame near-infrared (NIR) images, which trace the underlying stellar mass less impacted by dust star formation than UV or optical images. We leverage power {\it{JWST}} CEERS NIRCam images to present first quantitative identification characterization at $z>1$ based on NIR F444W high resolution (~1.3 kpc z ~ 1-3). identify these criteria ellipse fits. For this pilot study, we six examples...
Abstract We present a sample of 88 candidate z ∼ 8.5–14.5 galaxies selected from the completed NIRCam imaging Cosmic Evolution Early Release Science survey. These data cover ∼90 arcmin 2 (10 pointings) in six broadband filters and one medium-band filter. With this we confirm at higher confidence early JWST conclusions that bright epoch are more abundant than predicted by most theoretical models. construct rest-frame ultraviolet luminosity functions 9, 11, 14 show space density ( M UV = −20)...
Abstract We report the discovery of 15 exceptionally luminous 10 ≲ z 14 candidate galaxies discovered in first 0.28 deg 2 JWST/NIRCam imaging from COSMOS-Web survey. These sources span rest-frame UV magnitudes −20.5 > M −22, and thus constitute most intrinsically ≳ candidates identified by JWST to date. Selected via NIRCam imaging, deep ground-based observations corroborate their detection help significantly constrain photometric redshifts. analyze spectral energy distributions using...
Abstract We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin 2 of publicly available Cycle 1 data from COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) detection MIRI/F770W (∼25 mag), we identify two galaxies, COS-z8M1 CEERS-z7M1, that have best-fit photometric redshifts <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi>...
Abstract Our knowledge of relations between supermassive black holes and their host galaxies at z ≳ 1 is still limited, even though being actively sought out to ∼ 6. Here, we use the high resolution sensitivity JWST measure galaxy properties for 107 X-ray-selected type-I active galactic nuclei (AGNs) 0.68 < 2.5 with rest-frame optical/near-infrared imaging from COSMOS-Web PRIMER. Black hole masses ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...
Abstract We study of the role galaxy–galaxy interactions and disk instabilities in producing starburst activity galaxies out to z = 4. For this, we use a sample 387 with robust total star formation rate measurements from Herschel, gas masses Atacama Large Millimeter/submillimeter Array, stellar redshifts multiband photometry, JWST/NIRCam rest-frame optical imaging. Using mass-controlled samples, find an increased fraction interacting regime at all This increase correlates efficiency (SFE)...
This paper describes the observations and first data release (DR1) of ESO public spectroscopic survey "VANDELS, a deep VIMOS CANDELS CDFS UDS fields". VANDELS' main targets are star-forming galaxies at 2.4<z<5.5 massive passive 1<z<2.5. By adopting strategy ultra-long exposure times, from 20 to 80 hours per source, VANDELS is designed be deepest ever high-redshift Universe. Exploiting red sensitivity spectrograph, has obtained ultra-deep spectra covering wavelength 4800-10000 A with...
VANDELS is a uniquely-deep spectroscopic survey of high-redshift galaxies with the VIMOS spectrograph on ESO's Very Large Telescope (VLT). The has obtained ultra-deep optical (0.48 < lambda 1.0 micron) spectroscopy ~2100 within redshift interval z 7.0, over total area ~0.2 sq. degrees centred CANDELS UDS and CDFS fields. Based accurate photometric pre-selection, 85% targeted by were selected to be at z>=3. Exploiting red sensitivity refurbished spectrograph, fundamental aim provide high...
VANDELS is an ESO Public Spectroscopic Survey designed to build a sample of high-signal-to-noise ratio, medium-resolution spectra galaxies at redshifts between 1 and 6.5. Here we present the final Data Release Survey, comprising 2087 redshift measurements. We provide detailed description selection, observations, data reduction procedures. The catalogue reaches target selection completeness 40% i AB = 25. high signal-to-noise ratio (above 7 in 80% spectra) dispersion 2.5 Å allowed us measure...
Submillimeter/millimeter observations of dusty star-forming galaxies with the Atacama Large Millimeter/submillimeter Array (ALMA) have shown that dust continuum emission generally occurs in compact regions smaller than stellar distribution. However, it remains to be understood how systematic these findings are. Studies often lack homogeneity sample selection, target discontinuous areas inhomogeneous sensitivities, and suffer from modest u v coverage coming single array configurations....
Abstract We select and characterize a sample of massive (log( M * / ⊙ ) > 10.6) quiescent galaxies (QGs) at 3 < z 5 in the latest Cosmological Evolution Survey catalog (COSMOS2020). QGs are selected using new rest-frame color-selection method, based on their probability belonging to group defined by Gaussian mixture model (GMM) trained colors ( NUV − U , V J similarly 2 3. calculate threshold above which galaxy is classified as simulated from shark semi-analytical model. find that, ≥...
Our current understanding of the cosmic star formation history at z>3 is primarily based on UV-selected galaxies (i.e., LBGs). Recent studies H-dropouts have revealed that we may be missing a large proportion taking place in massive z>3. In this work, extend H-dropout criterion to lower masses select optically dark/faint (OFGs), order complete census between LBGs and H-dropouts. (H> 26.5 mag & [4.5] < 25 mag) combined with de-blending technique designed not only extremely dust-obscured but...
Abstract We analyze the evolution of massive (log 10 [ M ⋆ / ⊙ ] > 10) galaxies at z ∼ 1–4 selected from JWST Cosmic Evolution Early Release Survey (CEERS). infer physical properties all in CEERS NIRCam imaging through spectral energy distribution (SED) fitting with dense basis to select a sample high-redshift galaxies. Where available we include constraints additional observing modes, including 18 sources MIRI photometric coverage, and 28 spectroscopic confirmations NIRSpec or WFSS....
Abstract In this Letter, we report the discovery of highest redshift, heavily obscured, radio-loud (RL) active galactic nucleus (AGN) candidate selected using JWST NIRCam/MIRI, mid-IR, submillimeter, and radio imaging in COSMOS-Web field. Using multifrequency observations mid-IR photometry, identify a powerful, RL, growing supermassive black hole with significant spectral steepening energy distribution ( f 1.28 GHz ∼ 2 mJy, q 24 μ m = −1.1, α 1.28−3 − 1.2, Δ 0.4). conjunction ALMA, deep...
Abstract Substantial populations of massive quiescent galaxies at z ≥ 3 challenge our understanding rapid galaxy growth and quenching over short timescales. In order to piece together this evolutionary puzzle, more statistical samples these objects are required. Established techniques for identifying increasingly inefficient unconstrained > 3. As a result, studies report that as much 70% may be missed from existing surveys. work, we propose new empirical color selection technique designed...