A5060804995- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Advanced Image Fusion Techniques
- Infrared Target Detection Methodologies
- Gamma-ray bursts and supernovae
- Advanced Measurement and Metrology Techniques
- Spectroscopy and Laser Applications
- Advanced Statistical Methods and Models
- Remote-Sensing Image Classification
- African history and culture studies
- Impact of Light on Environment and Health
- Historical and Contemporary Political Dynamics
- Astronomical Observations and Instrumentation
- Plant Water Relations and Carbon Dynamics
- Adaptive optics and wavefront sensing
- Satellite Image Processing and Photogrammetry
University of Sheffield
2014-2022
Université Paris Cité
2014
Centre National de la Recherche Scientifique
2014
Astrophysique, Instrumentation et Modélisation
2014
Délégation Paris 7
2014
CEA Paris-Saclay
2014
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014
[abridged] We use the latest release of CIGALE, a galaxy SED fitting model relying on energy balance, to study influence an AGN in estimating both SFR and stellar mass galaxies, as well contribution power output host. Using formation SAM GALFORM, we create mock SEDs using realistic star histories (SFH) add Type 1, 2, or intermediate type whose bolometric luminosity can be variable. perform these catalogues with CIGALE assuming three different SFHs: single- double-exponentially-decreasing,...
Abstract Using deep Herschel and ALMA observations, we investigate the star formation rate (SFR) distributions of X-ray-selected active galactic nucleus (AGN) host galaxies at 0.5 < z 1.5 4, comparing them to that normal, star-forming (i.e. ‘main-sequence’, or MS) galaxies. We find 34–55 per cent AGNs in our sample have SFRs least a factor 2 below average MS galaxy, compared ≈15 all galaxies, suggesting significantly different SFR distributions. Indeed, when both are modelled as...
ABSTRACT We investigate the contribution of clumps and satellites to galaxy mass assembly. analysed spatially resolved HubbleSpace Telescope observations (imaging slitless spectroscopy) 53 star-forming galaxies at z ∼ 1–3. created continuum emission line maps pinpointed residual ‘blobs’ detected after subtracting disc. Those were separated into compact (unresolved) extended (resolved) components. Extended components have sizes ∼2 kpc comparable stellar age as discs, whereas are 1.5 dex less...
We explore the distribution of RMS=SFR/SFR_MS (where SFR_MS is star formation rate "Main Sequence" star-forming galaxies) for AGN hosts at z=1. split our sample into two bins X-ray luminosity divided Lx=2x10^43erg s-1 to investigate whether RMS changes as a function power. Our main results suggest that, when modelled log-normal (i.e. same shape that MS galaxies), galaxies hosting more powerful AGNs Lx>2x10^43erg s-1) display narrower shifted higher values compared their lower Lx...
We investigate the star-forming properties of 1620 X-ray selected AGN host galaxies as a function their specific luminosity (i.e., per unit stellar mass) -- proxy Eddington ratio. Our motivation is to determine whether there any evidence suppression star-formation at high ratios, which may hint toward "AGN feedback" effects. Star-formation rates (SFRs) are derived from fits Herschel-measured far-infrared spectral energy distributions, taking into account contamination AGN....
We present high angular resolution (0.13–0.4 arcsec) ALMA CO(2–1) and 1.7 mm continuum observations of the far-infrared-bright galaxy PKS 0023−26 ( z = 0.32), which hosts a young radio source as well luminous optical active galactic nucleus (AGN). Although young, powerful has already grown to size few kiloparsec, making it potentially capable affecting interstellar medium (ISM) host galaxy. detect very extended distribution molecular gas with mass between 0.3 3 × 10 M ⊙ , depending on X CO...
Using a phenomenological approach, we self-consistently model the redshift evolution of ultraviolet (UV) and infrared (IR) luminosity functions across cosmic time, as well range observed IR properties UV-selected galaxy population. This is an extension 2SFM (2 star-formation modes) formalism, which based on "main-sequence" star-forming galaxies, i.e. strong correlation between their stellar mass star formation rate (SFR), secondary population starbursts with excess formation. The balance UV...
Measuring the star-forming properties of AGN hosts is key to our understanding galaxy formation and evolution. However, this topic remains debated, partly due difficulties in separating infrared (i.e. 1--1000 $\mu$m) emission into components. Taking advantage archival far-infrared data from Herschel, we present a new set templates, introduce spectral energy distribution fitting code IRAGNSEP. Both can be used measure host properties, free contamination. To build these, sample 100 local ($z$...
ABSTRACT Studies investigating the relationship between active galactic nucleus (AGN) power and star formation rates (SFRs) of their host galaxies often rely on averaging techniques – such as stacking to incorporate information from non-detections. However, averages, especially means, can be strongly affected by outliers therefore give a misleading indication ‘typical’ case. Recently, number studies have taken step further binning sample in terms AGN (approximated 2–10 keV luminosity AGN),...
Supermassive black holes (SMBHs) are tightly correlated with their hosts but the origin of such connection remains elusive. To explore cosmic build-up this scaling relation, we present an empirically-motivated model that tracks galaxy and SMBH growth down to z=0. Starting from a random mass seed distribution at z=10, assume each evolves on star-forming "main sequence" (MS) BH follows recently-derived stellar (M$_{\star}$) dependent ratio between accretion rate star formation rate, going as...
The lack of a strong correlation between AGN X-ray luminosity ($L_X$; proxy for power) and the star formation rate (SFR) their host galaxies has recently been attributed to stochastic variability. Studies using population synthesis models have incorporated this by assuming broad, universal (i.e. does not depend on galaxy properties) probability distribution specific luminosities ratio $L_X$ stellar mass; common Eddington ratio). However, recent studies demonstrated that fails reproduce...
We use deep Herschel observations of the complete 2Jy sample powerful radio AGNs in local universe (0.05 < z 0.7) to probe their cool interstellar medium (ISM) contents and star-forming properties, comparing them against other samples nearby luminous quiescent galaxies. This allows us investigate triggering feedback mechanisms. find that dust masses strong-line galaxies (SLRGs) our are similar those radio-quiet quasars, median mass (Mdust = 2 x 10^7 Msun) is enhanced by a factor ~200...
We present a new modeling of the X-ray luminosity function (XLF) active galactic nuclei (AGNs) out to z ∼ 3, dissecting contributions main-sequence (MS) and starburst (SB) galaxies. For each galaxy population, we convolved observed stellar mass (M⋆) with grid M⋆-independent Eddington ratio (λEDD) distributions, normalized via empirical black hole accretion rate (BHAR) star formation (SFR) relations. Our simple approach yields an excellent agreement XLF since 3. find that redshift evolution...
We infer and compare the specific X-ray luminosity distributions for a sample of massive (i.e. $\log_{10} (M*/M\odot) > 10.5$) galaxies split according to their far-infrared-derived star-forming properties (i.e., starburst non-starburst) redshift. model each distribution as power-law with an upper lower turnover, adopt maximum likelihood method include information from non-detections in form limits. When we use our inferred calculate ratios high low sLx AGN (corresponding above below...
With the increasing number of ongoing space missions for Earth Observation (EO), there is a need to enhance data products by combining observations from various remote sensing instruments. We introduce new Transformer-based approach fusion, achieving up 10- to-30-fold increase in spatial resolution our hyperspectral data. trained network on synthetic set Sentinel-2 (S2) and Sentinel-3 (S3) images, simulated mission EnMAP (30 m resolution), leading fused product 21 bands at 30 ground...
Abstract CSS/GPS objects represent a key stage in the evolution of powerful radio AGN which jets are expanding through denser, kpc‐scale ISM host galaxies. Therefore, it is important both to understand how such triggered as galaxies evolve and directly quantify impact outflows induced by jet‐cloud interactions. Here, we show that sources likely be galaxy mergers, just like general. However, they more gas‐rich have higher star formation rates on average than their extended counterparts. Also,...
ABSTRACT The far-IR/sub-mm wavelength range contains a wealth of diagnostic information that is important for understanding the role active galactic nuclei (AGN) in galaxy evolution. Here we present results Herschel PACS and SPIRE observations complete sample 46 powerful 2 Jy radio AGN at intermediate redshifts (0.05 &lt; z 0.7), which represent deepest pointed major undertaken by Herschel. In order to assess importance non-thermal synchrotron emission far-IR wavelengths, also new APEX...