A5058200927- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Cosmology and Gravitation Theories
- Spacecraft and Cryogenic Technologies
- Radio Astronomy Observations and Technology
- Phase Equilibria and Thermodynamics
- Molecular Spectroscopy and Structure
- Superconducting Materials and Applications
- Combustion and flame dynamics
- Physics of Superconductivity and Magnetism
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Evolution and Paleontology Studies
- Bat Biology and Ecology Studies
- Diverticular Disease and Complications
- CCD and CMOS Imaging Sensors
- Particle Accelerators and Free-Electron Lasers
University of Cambridge
2018-2024
University of Bath
2019-2023
Centre de Recherche Astrophysique de Lyon
2016-2023
Institute of Astronomy
2023
Centre National de la Recherche Scientifique
2015-2018
Université Claude Bernard Lyon 1
2016-2018
École Normale Supérieure de Lyon
2017-2018
Observatoire de Lyon
2016-2018
Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères
2014-2016
Sorbonne Université
2016
We propose a novel method to constrain turbulence and bulk motions in massive galaxies, groups clusters, exploring both simulations observations. As emerged the recent picture of top-down multiphase condensation, hot gaseous halos are tightly linked all other phases terms cospatiality thermodynamics. While (10^7 K) perturbed by subsonic turbulence, warm (10^4 ionized neutral filaments condense out turbulent eddies. The peaks into cold molecular clouds (< 100 raining core via chaotic...
We have conducted a two-layered spectroscopic survey (1'x1' ultra deep and 3'x3' regions) in the Hubble Ultra Deep Field (HUDF) with Multi Unit Spectroscopic Explorer (MUSE). The combination of large field view, high sensitivity, wide wavelength coverage provides an order magnitude improvement spectroscopically confirmed redshifts HUDF; i.e., 1206 secure for HST continuum selected objects, which corresponds to 15% total (7904). redshift distribution extends well beyond z>3 HST/F775W...
We report ALMA Early Science observations of the Abell 1835 brightest cluster galaxy (BCG) in CO (3-2) and (1-0) emission lines. detect 5E10 solar masses molecular gas within 10 kpc BCG. Its velocity width ~130 km/s FWHM is too narrow to be supported by dynamical pressure. The may instead a rotating, turbulent disk oriented nearly face-on. forming stars at rate 100-180 per year. Roughly 1E10 projected 3-10 north-west east nucleus with line sight velocities lying between -250 +480 respect...
Abstract We present Atacama Large Millimeter/submillimeter Array and Multi-Unit Spectroscopic Explorer observations of the brightest cluster galaxy in Abell 2597, a nearby ( z = 0.0821) cool core galaxies. The data map kinematics three billion solar mass filamentary nebula that spans innermost 30 kpc galaxy’s core. Its warm ionized cold molecular components are both cospatial comoving, consistent with hypothesis optical traces envelopes many clouds drift velocity field hot X-ray atmosphere....
We present an Integral Field Unit survey of 73 galaxy clusters and groups with the VIsible Multi Object Spectrograph on Very Large Telescope. exploit data to determine H α gas dynamics kpc scales study feedback processes occurring within dense cluster cores. kinematic state ionized show that majority systems (∼2/3) have relatively ordered velocity fields are similar kinematics rotating discs decoupled from stellar brightest galaxy. The flux (>50 per cent) is typically associated these most...
A short 30 minute ALMA observation of the early-type galaxy NGC 5044, which resides at center an X-ray bright group with a moderate cooling flow, has detected 24 molecular structures within central 2.5 kpc. The masses vary from 3e5 to 1e7 Mo3 and CO(2-1) linewidths 15 65 km/s. Given large linewidths, observed are likely giant associations (GMAs) not individual clouds (GMCs). Only few GMAs spatially resolved cycle 0 beam average density these yields GMC volume filling factor about 15%....
We examine the radio properties of brightest cluster galaxies (BCGs) in a large sample X-ray selected galaxy clusters comprising Brightest Cluster Sample (BCS), extended BCS and ROSAT-ESO Flux Limited catalogues. have multifrequency observations BCG using variety data from Australia Telescope Compact Array, Jansky Very Large Array Long Baseline telescopes. The spectral energy distributions these objects are decomposed into component attributed to on-going accretion by active galactic nuclei...
We present a multiwavelength morphological analysis of star-forming clouds and filaments in the central (≲50 kpc) regions 16 low-redshift (z < 0.3) cool core brightest cluster galaxies. New Hubble Space Telescope imaging far-ultraviolet continuum emission from young (≲10 Myr), massive (≳5 M⊙) stars reveals filamentary clumpy morphologies, which we quantify by means structural indices. The FUV data are compared with X-ray, Lyα, narrow-band Hα, broad-band optical/IR, radio maps, providing high...
Abstract To advance our understanding of the fuelling and feedback processes which power Universe’s most massive black holes, we require a significant increase in knowledge molecular gas exists their immediate surroundings. However, behaviour this is poorly understood due to difficulties associated with observing it directly. We report on survey 18 brightest cluster galaxies lying cool cores, from detect core regions eight via carbon monoxide (CO), cyanide (CN) silicon (SiO) absorption...
ABSTRACT We have produced for the first time a detailed velocity map of giant filamentary nebula surrounding NGC 1275, Perseus cluster’s brightest galaxy, and revealed previously unknown rich structure across entire nebula. These new observations were obtained with optical imaging Fourier transform spectrometer SITELLE at CFHT. With its wide field view ( ∼11 arcmin × 11 arcmin), is only integral unit spectroscopy instrument able to cover 80 kpc 55 3.8 2.6 arcmin) large in 1275. Our analysis...
The origin of the cold gas in central galaxies groups is still a matter debate. We present Multi-Unit Spectroscopic Explorer (MUSE) observations 18 optically selected local ( z ≤ 0.017) brightest group (BGGs) to study kinematics and distribution optical emission-line gas. MUSE reveal morphologies including ten complex networks filaments extending up ∼10 kpc two compact (< 3 kpc) five extended (> 5 disk-dominated structures. Some rotating disks show rings elongated structures arising...
Abstract We present new high-spectral-resolution observations ( R = λ /Δ 7000) of the filamentary nebula surrounding NGC 1275, central galaxy Perseus cluster. These have been obtained with SITELLE, an imaging Fourier transform spectrometer installed on Canada–France–Hawai Telescope a field view <?CDATA $11^{\prime} \times 11^{\prime} $?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>11</mml:mn> <mml:mo accent="false">′</mml:mo> <mml:mo>×</mml:mo>...
We present multi-frequency observations of the radio galaxy Hydra-A (3C218) located in core a massive, X-ray luminous cluster. IFU spectroscopy is used to trace kinematics ionised and warm molecular hydrogen which are consistent with ~ 5 kpc rotating disc. Broad, double-peaked lines CO(2-1), [CII]157 $\mu$m [OI]63 detected. estimate mass cold gas within disc be M$_{gas}$ = 2.3 $\pm$ 0.3 x 10$^9$ M$_{\odot}$. These demonstrate that complex line profiles found atomic related or ring gas....
Centaurus A is the most nearby powerful AGN, widely studied at all wavelengths. Molecular gas has been found in halo a distance of ~20 kpc from galaxy centre, associated with HI shells. The molecular lies inside some IR and UV bright star-forming filaments that have recently observed direction radio jets. These archival data show there dust very weak star formation on scales hundreds parsecs. On top analysing combined data, we performed searches HCN(1-0) HCO+(1-0) emission ATCA interaction...
Multi-phase filamentary structures around Brightest Cluster Galaxies are likely a key step of AGN-feedback. We observed molecular gas in 3 cool cluster cores: Centaurus, Abell S1101, and RXJ1539.5 gathered ALMA MUSE data for 12 other clusters. Those observations show clumpy, massive long, 3--25 kpc, filaments, preferentially located the radio bubbles inflated by AGN (Active Galactic Nucleus). Two objects nuclear disks. The optical nebula is certainly tracing warm envelopes cold filaments....
Active galactic nuclei play a crucial role in the accretion and ejection of gas galaxies. Although their outflows are well studied, finding direct evidence has proved very difficult so far been done for few sources. A promising way to study significance cold is by observing absorption an active nucleus's extremely bright radio emission lying along line-of-sight. As such, we present ALMA CO(1-0) CO(2-1) observations Hydra-A brightest cluster galaxy (z=0.054) which reveal existence cold,...
In this work, we investigate the strength and impact of ionised gas outflows within $z \sim 0.04$ MaNGA galaxies. We find evidence for in 322 galaxies ($12\%$ analysed line-emitting sample), 185 which show AGN activity. Most are centrally concentrated with a spatial extent that scales sublinearly $R_{\rm e}$. The incidence is enhanced at higher masses, central surface densities deeper gravitational potentials, as well SFR luminosity. quantify strong correlations between mass outflow rates...
The dust destruction timescales in the cores of clusters galaxies are relatively short given their high central gas densities. However, substantial mid-infrared and sub-mm emission has been detected many brightest cluster galaxies. In this letter we present Herschel PACS SPIRE photometry galaxy three strong cooling flow clusters, A1068, A2597 Zw3146. This indicates that a mass cold is (>3 x 10^7 Mo) at temperatures significantly lower (20-28K) than previously thought based on limited MIR...
There is a strong spatial correlation between brightest clusters galaxies (BCGs) and the peak density cooling rate of intracluster medium (ICM). In this paper we combine integral field spectroscopy, CO observations X‐ray data to study three exceptional (Abell 1991, Abell 3444 Ophiuchus) where there physical dynamical offset BCG investigate connection ICM, cold gas being deposited central galaxy. We find majority optical line emission spatially coincident with in soft X‐rays. case A1991 make...
ABSTRACT This paper investigates the neutral gas phase of galactic winds via Na i Dλλ5890, 5895Å feature within z ∼ 0.04 MaNGA galaxies and directly compares their incidence strength to ionized detected same parent sample. We find evidence for outflows in 127 (∼5 per cent analysed line-emitting sample). ${\rm Na\, \small {\rm I}\ D}$ are preferentially seen with dustier central regions both wind phases more often found systems elevated star formation rate (SFR) surface densities, especially...
The intracluster medium (ICM) in the centers of galaxy clusters is heavily influenced by “feedback” from supermassive black holes (SMBHs). Feedback can drive turbulence ICM and turbulent dissipation potentially be an important source heating. Due to limited spatial spectral resolutions X-ray telescopes, direct observations hot have been challenging. Recently, we developed a new method measure using multiphase filaments as tracers. These are ubiquitous cluster observed at very high resolution...
The question of how much gas cools in the cores clusters galaxies has been focus many, multiwavelength studies past 30 years. In this letter we present first detections strongest atomic cooling lines, [C II], [O I] and [N two strong flow clusters, A1068 A2597, using Herschel PACS. These spectra indicate that substantial mass cold molecular (>10^9 Mo) known to be these systems is being irradiated by intense UV radiation, most probably from young stars. line widths FIR lines they share...