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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The complex physics of dusty star-forming galaxies at high redshifts as revealed by herschel and Spitzer
Astrophysical Journal, Volume 762, No. 2, Article 108, Year 2013
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Description
We combine far-infrared photometry from Herschel (PEP/HerMES) with deep mid-infrared spectroscopy from Spitzer to investigate the nature and the mass assembly history of a sample of 31 luminous and ultraluminous infrared galaxies ((U)LIRGs) at z &thk 1 and 2 selected in GOODS-S with 24 μm fluxes between 0.2 and 0.5 mJy. We model the data with a self-consistent physical model (GRASIL) which includes a state-of-the-art treatment of dust extinction and reprocessing. We find that all of our galaxies appear to require massive populations of old (>1 Gyr) stars and, at the same time, to host a moderate ongoing activity of star formation (SFR ≤ 100M yr-1). The bulk of the stars appear to have been formed a few Gyr before the observation in essentially all cases. Only five galaxies of the sample require a recent starburst superimposed on a quiescent star formation history. We also find discrepancies between our results and those based on optical-only spectral energy distribution (SED) fitting for the same objects; by fitting their observed SEDs with our physical model we find higher extinctions (by ΔAV &thk 0.81 and 1.14) and higher stellar masses (by Δlog(M) &thk 0.16 and 0.36 dex) for z &thk 1 and z &thk 2 (U)LIRGs, respectively. The stellar mass difference is larger for the most dust-obscured objects. We also find lower SFRs than those computed from LIR using the Kennicutt relation due to the significant contribution to the dust heating by intermediate-age stellar populations through "cirrus" emission (&thk73% and &thk66% of the total LIR for z &thk 1 and z &thk 2 (U)LIRGs, respectively). © 2013. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Lo Faro, Barbara
Italy, Padua
Università Degli Studi Di Padova
Franceschini, Alberto
Italy, Padua
Università Degli Studi Di Padova
Vaccari, Mattia
Italy, Padua
Università Degli Studi Di Padova
South Africa, Bellville
University of the Western Cape
Silva, Laura
Italy, Trieste
Osservatorio Astronomico Di Trieste
Rodighiero, Giulia
Italy, Padua
Università Degli Studi Di Padova
Berta, Stefano
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Bock, James J.
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Burgarella, Denis
France, Marseille
Laboratoire D'astrophysique de Marseille
Buat, Véronique
France, Marseille
Laboratoire D'astrophysique de Marseille
Cava, Antonio
Spain, Madrid
Universidad Complutense de Madrid
Clements, David L.
United Kingdom, London
Imperial College London
Cooray, Asantha Roshan
United States, Irvine
University of California, Irvine
Farrah, Duncan G.
United Kingdom, Brighton
University of Sussex
United States, Blacksburg
Virginia Polytechnic Institute and State University
Feltre, Anna
Italy, Padua
Università Degli Studi Di Padova
Hurley, Peter Donald
United Kingdom, Brighton
University of Sussex
Lutz, Dieter
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Magdis, Georgios E.
United Kingdom, Oxford
University of Oxford
Magnelli, Benjamin
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Marchetti, Lucia
Italy, Padua
Università Degli Studi Di Padova
Oliver, Seb J.
United Kingdom, Brighton
University of Sussex
Page, Mathew J.
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Popesso, Paola
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Pozzi, Francesca
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Rigopoulou, Dimitra
United Kingdom, Didcot
Ral Space
United Kingdom, Oxford
University of Oxford
Rowan-Robinson, Michael
United Kingdom, London
Imperial College London
Roseboom, Isaac G.
United Kingdom, Brighton
University of Sussex
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Scott, Douglas J.
Canada, Vancouver
The University of British Columbia
Smith, Anthony J.
United Kingdom, Brighton
University of Sussex
Symeonidis, Myrto
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Wang, Lingyu
United Kingdom, Brighton
University of Sussex
Wuyts, Stijn
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Statistics
Citations: 32
Authors: 31
Affiliations: 18
Identifiers
Doi:
10.1088/0004-637X/762/2/108
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental