A5011335986- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- Impact of Light on Environment and Health
- Pulsars and Gravitational Waves Research
- Atmospheric Ozone and Climate
- Scientific Research and Discoveries
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Remote Sensing in Agriculture
- Superconducting and THz Device Technology
- Molecular Spectroscopy and Structure
- Nuclear physics research studies
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
Ghent University
2016-2025
University College London
2015-2024
Ghent University Hospital
2023
University of Cambridge
2014-2018
Institute of Astronomy
2014-2015
European Southern Observatory
2011-2013
Kingston Health Sciences Centre
2013
Imperial College London
2011
Institut d'Astrophysique de Paris
2011
Vrije Universiteit Brussel
2011
We analyze the applicability of far-infrared fine-structure lines [CII] 158 micron, [OI] 63 micron and [OIII] 88 to reliably trace star formation rate (SFR) in a sample low-metallicity dwarf galaxies from Herschel Dwarf Galaxy Survey compare with broad various types metallicities literature. study trends scatter relation between SFR (as traced by GALEX FUV MIPS 24 micron) line emission, on spatially resolved global galaxy scales, galaxies. assemble measurements literature infer whether can...
We present an updated version of SKIRT, a 3D Monte Carlo radiative transfer code developed to simulate dusty galaxies. The main novel characteristics the SKIRT are use stellar foam generate random positions, efficient combination eternal forced scattering and continuous absorption, new library approach that links DustEM dust emission library. This enables fast, accurate self-consistent calculation arbitrary mixtures transiently heated grains polycyclic aromatic hydrocarbons, even for full...
The Dwarf Galaxy Survey (DGS) program is studying low-metallicity galaxies using 230h of far-infrared (FIR) and submillimetre (submm) photometric spectroscopic observations the Herschel Space Observatory draws to this a rich database wide range wavelengths tracing dust, gas stars. This sample 50 includes largest metallicity achievable in local Universe including lowest (Z) galaxies, 1/50 Zsun, spans 4 orders magnitude star formation rates. survey designed get handle on physics interstellar...
Context. The far-infrared (FIR) lines are important tracers of the cooling and physical conditions interstellar medium (ISM) rapidly becoming workhorse diagnostics for galaxies throughout universe. There clear indications a different behavior these at low metallicity that needs to be explored.
Abstract The Reionization Era Bright Emission Line Survey (REBELS) is a cycle-7 ALMA Large Program (LP) that identifying and performing first characterization of many the most luminous star-forming galaxies known in z > 6.5 universe. REBELS providing this probe by systematically scanning 40 brightest UV-selected identified over 7 deg 2 area for bright [C ii ] 158 μ m [O iii 88 lines dust-continuum emission. Selection targets was done combining our own other photometric selections, each...
ALMA observations have revealed the presence of dust in first generations galaxies Universe. However, temperature $T_d$ remains mostly unconstrained due to few available FIR continuum data at redshift $z>5$. This introduces large uncertainties several properties high-$z$ galaxies, namely their masses, infrared luminosities, and obscured fraction star formation. Using a new method based on simultaneous [CII] 158$\mu$m line underlying measurements, we derive $T_ d$ detected $z\approx 7$ Large...
ABSTRACT We include a fully coupled treatment of metal and dust enrichment into the Delphi semi-analytic model galaxy formation to explain content 13 Lyman break galaxies (LBGs) detected by Atacama Large millimetre Array (ALMA) REBELS Program at z ≃ 7. find that mass, Md, is regulated combination Type II supernova production, astration, shock destruction, ejection in outflows; grain growth (with standard time-scale τ0 = 30 Myr) plays negligible role. The predicts dust-to-stellar mass ratio...
We report 18 dust continuum detections ($\geq 3.3\sigma$) at $\sim88{\rm \mu m}$ and $158{\rm out of 49 ultraviolet(UV)-bright galaxies ($M_{\rm UV} < -21.3$ mag) $z>6.5$, observed by the Cycle-7 ALMA Large Program, REBELS its pilot programs. This has more than tripled number known $z>6.5$. Out these detections, 12 are reported for first time as part REBELS. In addition, 15 detected also show a [CII]$_{\rm 158{\rm m}}$ emission line, providing us with accurate redshifts. anticipate line from...
ABSTRACT We present specific star formation rates (sSFRs) for 40 ultraviolet (UV)-bright galaxies at z ∼ 7–8 observed as part of the Reionization Era Bright Emission Line Survey (REBELS) Atacama Large Millimeter/submillimeter Array (ALMA) large programme. The sSFRs are derived using improved rate (SFR) calibrations and spectral energy distribution (SED)-based stellar masses, made possible by measurements far-infrared (FIR) continuum emission [C ii]-based spectroscopic redshifts. median sSFR...
We analyse FIR dust continuum measurements for 14 galaxies ($z\approx 7$) in the ALMA REBELS LP to derive their physical properties. Our model uses three input data: (a) UV spectral slope, $\beta$, (b) observed flux at $1500$A, $F_{\rm UV}$, (c) $\approx 158\mu$m, $F_{158}$, and considers Milky Way (MW) SMC extinction curves, along with different geometries. find that have (28-90.5)% of star formation obscured; total (UV+IR) rates are range $31.5 < {\rm SFR}/ (M_\odot yr}^{-1}) 129.5$. The...
We present Herschel observations of 62 early-type galaxies (ETGs), including 39 morphologically classified as S0+S0a and 23 ellipticals using SPIRE at 250, 350, 500 μm part the volume-limited Reference Survey (HRS). detect dust emission in 24% 62% S0s. The mean temperature is 〈Td〉 = 23.9 ± 0.8 K, warmer than that found for late-type Virgo Cluster. mass entire detected sample logMd 6.1 0.1 M☉ with a dust-to-stellar-mass ratio log(Md/M*) −4.3 0.1. Including non-detections, these parameters are...
We gather infrared (IR) photometric data from 8 to 500 microns (Spitzer, WISE, IRAS and Herschel) for all of the HRS galaxies. Draine & Li (2007) models are fit which stellar contribution has been carefully removed. find that our coverage is sufficient constrain parameters a strong constraint on 20-60 range mandatory estimate relative photo-dissociation regions IR SED. The SED tend systematically under-estimate observed flux densities, especially low mass systems. provide output galaxies:...
We present an analysis of the dust and gas in Andromeda, using Herschel images sampling entire far-infrared peak. fit a modified-blackbody model to ∼4000 quasi-independent pixels with spatial resolution ∼140 pc find that variable dust-emissivity index (β) is required data. no significant long-wavelength excess above this model, suggesting there cold component. show gas-to-dust ratio varies radially, increasing from ∼20 center ∼70 star-forming ring at 10 kpc, consistent metallicity gradient....
Aims. In this work, we aim to provide a consistent analysis of the dust properties from metal-poor metal-rich environments by linking them fundamental galactic parameters.
We describe the Herschel Virgo Cluster Survey (HeViCS) and first data obtained as part of Science Demonstration Phase (SDP). The cover a central 4x4 sq deg region cluster. use SPIRE PACS photometry to produce 100, 160, 250, 350 500 micron luminosity functions (LFs) for optically bright galaxies that are selected at detected in all bands. compare these LFs with those previously derived using IRAS, BLAST Herschel-ATLAS data. do not have large numbers faint or examples very luminous seen...
The [C ii] 157.74 μm line is an important coolant for the neutral interstellar gas. Since brightest spectral most galaxies, it a potentially powerful tracer of star formation activity. In this paper, we present calibration rate (SFR) as function luminosity sample 24 star-forming galaxies in nearby Universe. This includes objects classified H ii regions or low-ionization nuclear emission-line regions, but omits all Seyfert with significant contribution from active galactic nucleus to...
We present new photometric data from our Herschel Key Programme, the Dwarf Galaxy Survey (DGS), dedicated to observation of gas and dust in 48 low-metallicity environments. They were observed with PACS SPIRE onboard at 70,100,160,250,350, 500 microns. focus on a systematic comparison derived FIR properties (FIR luminosity, mass, temperature emissivity index) more metal-rich galaxies investigate detection potential submm excess. The reduction method is adapted for each galaxy derive most...
We study the spectral energy distribution (SED) of radio continuum emission from KINGFISH sample nearby galaxies to understand energetics and origin this emission. Effelsberg multi-wavelength observations at 1.4GHz, 4.8GHz, 8.5GHz, 10.5GHz combined with archive data allow us, for first time, determine mid-radio (1-10 GHz, MRC) bolometric luminosities further present calibration relations vs. monochromatic luminosities. The 1-10 GHz SED is fitted using a Bayesian Markov Chain Monte Carlo...
Theoretical models predict that core-collapse supernovae (CCSNe) can be efficient dust producers (0.1-1.0 Msun), potentially accounting for most of the production in early Universe. Observational evidence this efficiency is however currently limited to only a few CCSN remnants (e.g., SN1987A, Crab Nebula). In paper, we revisit mass produced Cassiopeia A (Cas A), ~330-year old O-rich Galactic supernova remnant (SNR) embedded dense interstellar foreground and background. We present first...
The Herschel Reference Survey (HRS) is a guaranteed time key project aimed at studying the physical properties of interstellar medium in galaxies nearby universe. This volume limited, K-band selected sample composed spanning whole range morphological types (from ellipticals to late-type spirals) and environments field centre Virgo Cluster). We present flux density measurements 323 HRS three bands Spectral Photometric Imaging Receiver (SPIRE), 250, 350 500 microns. Aperture photometry...
The GALEX Ultraviolet Virgo Cluster Survey (GUViCS) is a complete blind survey of the cluster covering about 40 sq. deg. in far UV (FUV, lambda_eff=1539A, Delta-lambda=442A) and 120 near (NUV, lambda_eff=2316A, Delta-lambda=1060A). goal to study ultraviolet (UV) properties galaxies rich environment, spanning wide luminosity range from giants dwarfs, regardless prior knowledge their star formation activity. data will be combined with those other bands (optical: NGVS; far-infrared - submm:...
The purpose of this work is the characterization radial distribution dust, stars, gas, and star-formation rate (SFR) in a sub-sample 18 face-on spiral galaxies extracted from DustPedia sample. This study performed by exploiting multi-wavelength, UV to sub-mm bands, database, addition molecular (12CO) atomic (HI) gas maps metallicity abundance information available literature. We fitted surface brightness profiles tracers dust mass density total SFR with an exponential curve derived their...