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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Herschel unveils a puzzling uniformity of distant dusty galaxies
Astronomy and Astrophysics, Volume 518, No. 7-8, Article L29, Year 2010
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Description
The Herschel Space Observatory enables us to accurately measure the bolometric output of starburst galaxies and active galactic nuclei (AGN) by directly sampling the peak of their far-infrared (IR) emission. Here we examine whether the spectral energy distribution (SED) and dust temperature of galaxies have strongly evolved over the last 80% of the age of the Universe. We discuss possible consequences for the determination of starformation rates (SFR) and any evidence for a major change in their star-formation properties. We use Herschel deep extragalactic surveys from 100 to 500 μ m to compute total IR luminosities in galaxies down to the faintest levels, using PACS and SPIRE in the GOODS-North field (PEP and HerMES key programs). An extension to fainter luminosities is done by stacking images on 24 μ m prior positions. We show that measurements in the SPIRE bands can be used below the statistical confusion limit if information at higher spatial resolution is used, e.g. at 24 μ m, to identify "isolated" galaxies whose flux is not boosted by bright neighbors. Below z ∼ 1.5, mid-IR extrapolations are correct for star-forming galaxies with a dispersion of only 40% (0.15 dex), therefore similar to z ∼ 0 galaxies, over three decades in luminosity below the regime of ultra-luminous IR galaxies (ULIRGs, LIR ≥ 1012 L⊙). This narrow distribution is puzzling when considering the range of physical processes that could have affected the SED of these galaxies. Extrapolations from only one of the 160 μ m, 250 μ m or 350 μ m bands alone tend to overestimate the total IR luminosity. This may be explained by the lack of far-IR constraints around and above ∼150 μ m (rest-frame) before Herschel on those templates. We also note that the dust temperature of luminous IR galaxies (LIRGs, LIR ≥ 1011 L⊙) around z ∼ 1 is mildly colder by 10-15% than their local analogs and up to 20% for ULIRGs at z ∼ 1.6 (using a single modified blackbody-fit to the peak far-IR emission with an emissivity index of β = 1.5). Above z = 1.5, distant galaxies are found to exhibit a substantially larger mid- over far-IR ratio, which could either result from stronger broad emission lines or warm dust continuum heated by a hidden AGN. Two thirds of the AGNs identified in the field with a measured redshift exhibit the same behavior as purely star-forming galaxies. Hence a large fraction of AGNs harbor coeval star formation at very high SFR and in conditions similar to purely star-forming galaxies. © 2010 ESO.
Authors & Co-Authors
Elbaz, David
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Hwang, Ho-seong
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Magnelli, Benjamin
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Daddi, Emmanuele
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Aussel, Hervé
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Altieri, Bruno
Spain, Madrid
European Space Astronomy Centre
Amblard, Alexandre
United States, Irvine
University of California, Irvine
Andreani, Paola M.
Germany, Garching Bei Munchen
European Southern Observatory
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Arumugam, Vinodiran
United Kingdom, Edinburgh
The University of Edinburgh
Auld, Robbie R.
United Kingdom, Cardiff
Cardiff University
Berta, Stefano
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Blain, Andrew W.
United States, Pasadena
California Institute of Technology
Bock, James J.
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Bongiovanni, Ángel Manuel
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Boselli, Alessandro
France, Marseille
Oamp Observatoire Astronomique de Marseille-provence
Buat, Véronique
France, Marseille
Oamp Observatoire Astronomique de Marseille-provence
Burgarella, Denis
France, Marseille
Oamp Observatoire Astronomique de Marseille-provence
Castro-Rodriguéz, Nieves
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Cava, Antonio
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Cepa, J.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Chanial, Pierre F.
United Kingdom, London
Imperial College London
Chary, Ranga Ram
United States, Pasadena
California Institute of Technology
Cimatti, Andrea
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Clements, David L.
United Kingdom, London
Imperial College London
Conley, Alexander J.
United States, Boulder
Planetary Solutions, Inc.
Conversi, Luca
Spain, Madrid
European Space Astronomy Centre
Cooray, Asantha Roshan
United States, Irvine
University of California, Irvine
United States, Pasadena
California Institute of Technology
Dickinson, Mark E.
United States, Tucson
National Optical Astronomy Observatory
Dowell, Charles Darren
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
James S. Dunlop, James S.
United Kingdom, Edinburgh
The University of Edinburgh
Dwek, Eli
United States, Greenbelt
Nasa Goddard Space Flight Center
Eales, Stephen A.
United Kingdom, Cardiff
Cardiff University
Farrah, Duncan G.
United Kingdom, Brighton
University of Sussex
Förster-Schreiber, Natascha M.F.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Franceschini, Alberto
Italy, Padua
Università Degli Studi Di Padova
Gear, Walter K.P.
United Kingdom, Cardiff
Cardiff University
Genzel, Reinhardt
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Glenn, Jason
United States, Boulder
Planetary Solutions, Inc.
Griffin, Matthew J.
United Kingdom, Cardiff
Cardiff University
Gruppioni, Carlotta
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Halpern, Mark
Canada, Vancouver
The University of British Columbia
Hatziminaoglou, Evanthia
Germany, Garching Bei Munchen
European Southern Observatory
Ibar, E.
United Kingdom, Edinburgh
Uk Astronomy Technology Centre
Isaak, Kate G.
United Kingdom, Cardiff
Cardiff University
Ivison, Robert J.
United Kingdom, Edinburgh
The University of Edinburgh
United Kingdom, Edinburgh
Uk Astronomy Technology Centre
Lagache, Guilaine
France, Gif-sur-yvette
Université Paris-saclay
Le Borgne, Damien
France, Paris
Sorbonne Université
Le Floc'H, Émeric
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Levenson, Louis R.
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Lu, Nanyao
United States, Pasadena
California Institute of Technology
Lutz, Dieter
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Madden, Suzanne C.
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Maffei, Bruno
United Kingdom, Manchester
The University of Manchester
Magdis, Georgios E.
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Mainetti, Gabrielle
Italy, Padua
Università Degli Studi Di Padova
Maiolino, Roberto
Italy, Monte Porzio Catone
Osservatorio Astronomico Di Roma
Marchetti, Lucia
Italy, Padua
Università Degli Studi Di Padova
Mortier, Angela M.J.
United Kingdom, London
Imperial College London
Nguyên, Hien Trong
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Nordon, Raanan
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
O'Halloran, Brian
United Kingdom, London
Imperial College London
Okumura, Koryo
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Oliver, Seb J.
United Kingdom, Brighton
University of Sussex
Omont, Alain A.
France, Paris
Sorbonne Université
Page, Mathew J.
United Kingdom, London
University College London
Panuzzo, Pasquale
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Papageorgiou, Andreas
United Kingdom, Cardiff
Cardiff University
Pearson, Christopher P.
United Kingdom, Didcot
Rutherford Appleton Laboratory
Canada, Lethbridge
University of Lethbridge
Pérez-Fournon, Ismael
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Perez Garcia, A. M.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Poglitsch, Albrecht
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Pohlen, Michael
United Kingdom, Cardiff
Cardiff University
Popesso, Paola
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Pozzi, Francesca
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Rawlings, J. I.
United Kingdom, London
University College London
Rigopoulou, Dimitra
United Kingdom, Didcot
Rutherford Appleton Laboratory
United Kingdom, Oxford
University of Oxford
Riguccini, Laurie A.
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Rodighiero, Giulia
Italy, Padua
Università Degli Studi Di Padova
Roseboom, Isaac G.
United Kingdom, Brighton
University of Sussex
Rowan-Robinson, Michael
United Kingdom, London
Imperial College London
Saintonge, Amélie
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Śanchez-Portal, Miguel
Spain, Madrid
European Space Astronomy Centre
Santini, Paola
Italy, Monte Porzio Catone
Osservatorio Astronomico Di Roma
Sauvage, Marc
France, Gif-sur-yvette
Commissariat a L'energie Atomique et Aux Energies Alternatives
Schulz, Bernhard
United States, Pasadena
California Institute of Technology
Scott, Douglas J.
Canada, Vancouver
The University of British Columbia
Seymour, Nick
United Kingdom, London
University College London
Shupe, David L.
United States, Pasadena
California Institute of Technology
Smith, Anthony J.
United Kingdom, Brighton
University of Sussex
Stevens, Jason A.
United Kingdom, Hatfield
University of Hertfordshire
Sturm, Eckhard
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Symeonidis, Myrto
United Kingdom, London
University College London
Tacconi, Linda J.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Trichas, Markos
United Kingdom, London
Imperial College London
Tugwell, K. E.
United Kingdom, London
University College London
Vaccari, Mattia
Italy, Padua
Università Degli Studi Di Padova
Valtchanov, Ivan
Spain, Madrid
European Space Astronomy Centre
Vieira, Joaquin D.
United States, Pasadena
California Institute of Technology
Vigroux, Laurent G.
France, Paris
Sorbonne Université
Wang, Lingyu
United Kingdom, Brighton
University of Sussex
Wright, Gillian S.
United Kingdom, Edinburgh
Uk Astronomy Technology Centre
Xu, Cong Kevin
United States, Pasadena
California Institute of Technology
Zemcov, Michael B.
United States, Pasadena
California Institute of Technology
United States, Pasadena
Jet Propulsion Laboratory
Statistics
Citations: 181
Authors: 103
Affiliations: 31
Identifiers
Doi:
10.1051/0004-6361/201014687
ISSN:
00046361
Research Areas
Environmental
Study Design
Cross Sectional Study