A5066439202- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Spectroscopy and Laser Applications
- Dark Matter and Cosmic Phenomena
- Molecular Spectroscopy and Structure
- Advanced Measurement and Metrology Techniques
- Image and Signal Denoising Methods
- Advanced Fluorescence Microscopy Techniques
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Superconducting and THz Device Technology
- Impact of Light on Environment and Health
- Plant Water Relations and Carbon Dynamics
- COVID-19 diagnosis using AI
- Computational Physics and Python Applications
Centre National de la Recherche Scientifique
2021-2024
University of Sussex
2024
Aix-Marseille Université
2021-2024
Laboratoire d’Astrophysique de Marseille
2021-2024
Château Gombert
2023-2024
China University of Petroleum, East China
2024
Université Grenoble Alpes
2022
Institut polytechnique de Grenoble
2022
Institut National de Physique Nucléaire et de Physique des Particules
2022
Nanjing University
2016-2021
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...
Over the past decade, existence of a substantial population optically invisible, massive galaxies at $z\gtrsim3$ has been implied from mid-infrared to millimeter observations. With unprecedented sensitivity JWST, such extremely galaxy candidates have immediately identified even $z>7$, in much larger numbers than expected. These discoveries raised hot debate. If confirmed, early, high-mass challenge current models formation. However, lack spectroscopic confirmations leads uncertain stellar...
ABSTRACT The PRobe far-Infrared Mission for Astrophysics (PRIMA) concept aims to perform mapping with spectral coverage and sensitivities inaccessible previous FIR space telescopes. PRIMA’s imaging instrument, PRIMAger, provides unique hyperspectral simultaneously covering 25–235 µm. We synthesize images representing a deep, 1500 h deg−2 PRIMAger survey, realistic instrumental confusion noise. demonstrate that we can construct catalogues of galaxies high purity (&gt;95 per cent) at...
To understand early star formation, it is essential to determine the dust mass budget of high-redshift galaxies. Sub-millimeter rest-frame emission, dominated by cold dust, an unbiased tracer mass. The New IRAM KID Arrays 2 (NIKA2) conducted a deep blank field survey at 1.2 and 2.0,mm in GOODS-N as part NIKA2 Cosmological Legacy Survey (N2CLS), detecting 65 sources with S/N Thanks dedicated interferometric program NOEMA other high-angular resolution data, we identified multi-wavelength...
We report the discovery of an ultra-massive grand-design red spiral galaxy, named Zhúlóng (Torch Dragon), at z_ phot in JWST PANORAMIC survey; it is most distant bulge+disk galaxy candidate with arms known to date. displays extraordinary combination properties: (1) a classical bulge centered large, face-on exponential stellar disk (half-light radius R_ e = 3.7 ± 0.1 kpc ) extending across 19 kpc; (2) clear transition from red, quiescent core (F150W-F444W=3.1 mag) high mass surface density...
Abstract We analyse the intrinsic velocity dispersion properties of 648 star-forming galaxies observed by Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, to explore relation gas dispersions with star formation rates (SFRs), SFR surface densities ($\rm {\Sigma _{SFR}}$), stellar masses, and mass _{*}}$). By combining high z galaxies, we found that there is a good correlation between as well $\rm _{SFR}}$. But _{*}}$ moderate. comparing our results predictions theoretical...
In this work, we revisit the size-luminosity relation of extended narrow line regions (ENLRs) using a large sample nearby active galactic nuclei (AGN) from Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. The ENLRs ionized by AGN are identified through spatially resolved BPT diagram, which results in 152 AGN. By combining our with literature high-luminosity quasars, found tight log-linear between size ENLR and [O III]{\lambda}5007{\AA} luminosity over four orders magnitude...
Aims. Deep millimeter surveys are necessary to probe the dust-obscured galaxies at high redshift. We conducted a large observing program 1.2 and 2 mm with NIKA2 camera installed on IRAM 30-meter telescope. This Cosmological Legacy Survey (N2CLS) covers two emblematic fields: GOODS-N COSMOS. introduce N2CLS survey present new number count measurements based tiered observations from October 2017 May 2021. Methods. develop an end-to-end simulation that combines input sky model instrument noise...
ABSTRACT Galaxy mergers and interactions are expected to play a significant role leading offsets between gas stellar motions in galaxies. Herein, we cross-match galaxies Mapping Nearby Galaxies at Apache Point Observatory MPL-8 with the Dark Energy Spectroscopic Instrument Legacy Surveys identify 311 merging that have reliable measurements of ΔPA, difference kinematic position angles, investigate impacts on gas–stellar rotation misalignments. We find fractions misaligned (30$^\circ \,...
Context. As the millimeter wavelength range remains a largely unexplored spectral region for galaxies, IMEGIN large program aims to map continuum emission of 22 nearby galaxies at 1.15 and 2 mm. Aims. Using high-resolution maps produced by NIKA2 camera, we explore existence very cold dust take possible contamination free–free synchrotron into account. We study IR-to-radio coming from different regions along galactic plane vertical distances. Methods. New observations NGC 891, using camera on...
One of the most prominent features galaxy clusters is presence a dominant population massive ellipticals in their cores. Stellar archaeology suggests that these gigantic beasts assembled stars early Universe via starbursts. However, role dense environments and detailed physical mechanisms triggering starburst activities remain unknown. Here we report spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) observations CO $J= 3-2$ emission line, with resolution about 2.5...
Negative feedback from accretion on to supermassive black holes (SMBHs), that is remove gas and suppress star formation in galaxies, has been widely suggested. However, for Seyfert galaxies which harbour less active, moderately accreting SMBHs the local Universe, capability of their hole activity elusive. We present spatially resolved H α measurements trace ongoing compare specific rate with a sample star-forming whose global galaxy properties are controlled be same as Seyferts. From...
This study presents the first millimeter continuum mapping observations of two nearby galaxies, starburst spiral galaxy NGC2146 and dwarf NGC2976, at 1.15 mm 2 using NIKA2 camera on IRAM 30m telescope, as part Guaranteed Time Large Project IMEGIN. These provide robust resolved information about physical properties dust in galaxies by constraining their FIR-radio SED domain. After subtracting contribution from CO line emission, SEDs are modeled spatially a Bayesian approach. Maps mass surface...
Changing-look Active Galactic Nuclei (CL-AGNs) are a subset of AGNs in which the broad Balmer emission lines appear or disappear within few years. We use Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey to identify five CL-AGNs. The 2-D photometric and kinematic maps reveal common features as well some unusual properties CL-AGN hosts compared AGN general. All MaNGA CL-AGNs reside star-forming main sequence, similar non-changing-look (NCL-AGNs). $80\% \pm 16\%$ our do...
The NIKA2 Guaranteed-Time SZ Large Program (LPSZ) is dedicated to the high-angular resolution mapping of a representative sample 45 SZ-selected galaxy clusters drawn from catalogues Planck satellite, or Atacama Cosmology Telescope. LPSZ spans mass range 3 11 × 10 14 M ⊙ and redshift 0:5 0:9, extending higher lower previous samples cluster calibration universal properties estimation. main goals are measurement average radial profile ICM pressure up R 500 by combining with ACT data, estimation...
Dust polarization observations are a powerful, practical tool to probe the geometry (and some extent, strength) of magnetic fields in star-forming regions. In particular, Planck data have revealed importance on large scales molecular clouds. However, due insufficient resolution, unable constrain B-field prestellar and protostellar scales. The high angular resolution 11.7 arcsec provided by NIKA2-Pol 1.15 mm polarimetric imaging, corresponding $\sim$ 0.02 pc at distance Orion cloud (OMC),...
Context. The thermodynamical properties of the intracluster medium (ICM) are driven by scale-free gravitational collapse, but they also reflect rich astrophysical processes at play in galaxy clusters. At low masses (∼10 14 M ⊙ ) and high redshift ( z ≳ 1), these remain poorly constrained, observationally speaking, due to difficulty obtaining resolved sensitive data. Aims. We aim investigate inner structure ICM as seen through Sunyaev–Zel’dovich (SZ) effect this regime mass redshift. focused...
In the past decade filaments have been recognised as a major structural element of interstellar medium, densest these hosting formation most stars. some star-forming molecular clouds converging networks filaments, also known hub filament systems, can be found. These hubs are believed to preferentially associated massive star formation. As today, there no metrics that allow systematic quantification network convergence. Here, we used IRAM 30m NIKA2 observations Galactic plane from GASTON...
We propose to build an integral field unit (IFU) for the Robert Stobie Spectrograph (RSS) on Southern African Large Telescope (SALT). This IFU (PSI) will employ scrambling properties of fibers address fundamental problems in achieving photon-limited sky subtraction due variations pupil illumination during observations. PSI be fully encapsulated with a compact folding scheme standard long slit mask—far thinner than any previous fiber-based implementation. The cover 14 x 24 arcsec sky,...
In cluster cosmology, masses are the main parameter of interest. They needed to constrain cosmological parameters through number count. As mass is not an observable, a scaling relation link integrated Compton Y, i.e. Sunyaev-Zeldovich observable (SZ). Planck results obtained with counts based on measured clusters at low redshift ($z$<0.5) observed in SZ and X-ray. Large Program (LPSZ) NIKA2 collaboration, will be sample 38 intermediate high ($0.5<z<0.9$) angular resolution both Thanks...
The NIKA2 camera operating at the IRAM 30-m telescope excels in high-angular resolution mapping of thermal Sunyaev-Zel’dovich effect towards galaxy clusters intermediate and high-redshift. As part guaranteed-time, SZ Large Program (LPSZ) aims tSZ-mapping a representative sample SZ-selected catalogues Planck satellite Atacama Cosmology Telescope, also observed X-ray with XMM-Newton or Chandra . Having completed observations January 2023, we present tSZ maps 38 spanning targeted mass (3 < M...
High-resolution mapping of the hot gas in galaxy clusters is a key tool for cluster-based cosmological analyses. Taking advantage NIKA2 millimeter camera operated at IRAM 30-m telescope, SZ Large Program seeks to get high-resolution follow-up 38 covering wide mass range intermediate high redshift. The measured fluxes will be essential calibrate scaling relation and mean pressure profile, needed exploitation surveys. We present this study method infer profile from cluster observations. have...
Aims. High-redshift dusty star-forming galaxies (DSFGs) are proposed to be the progenitors of massive quiescent arising at cosmic noon, providing a crucial insight into formation, assembly, and early quenching in Universe. However, their high redshift combined with dust obscuration adds significant difficulties measurement, which is mandatory for detailed studies physical properties. Blind mm spectral scans most unbiased way prinicple obtaining accurate spectroscopic redshifts these sources,...
We develop a new framework to constrain the source redshift. The method jointly accounts for detection/non-detection of spectral lines and prior information from photometric redshift total infrared luminosity energy distribution analysis. uses estimated predict line fluxes at given redshifts generates model spectra. redshift-dependent models are then compared with observed spectra find Results. apply aforementioned joint analysis four high-z dusty star-forming galaxy candidates selected...