| HAL : hal-00662135, version 1 |
| arXiv : 1005.1072 |
| Fiche détaillée | Récupérer au format |
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| The far-infrared/radio correlation as probed by Herschel |
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| R. J. Ivison 1B. Magnelli 2 |
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| (06/05/2010) |
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| We set out to determine the ratio, q(IR), of rest-frame 8-1000um flux, S(IR), to monochromatic radio flux, S(1.4GHz), for galaxies selected at far-IR and radio wavelengths, to search for signs that the ratio evolves with redshift, luminosity or dust temperature, and to identify any far-IR-bright outliers - useful laboratories for exploring why the far-IR/radio correlation is generally so tight when the prevailing theory suggests variations are almost inevitable. We use flux-limited 250-um and 1.4-GHz samples, obtained in GOODS-N using Herschel (HerMES; PEP) and the VLA. We determine bolometric IR output using ten bands spanning 24-1250um, exploiting data from PACS and SPIRE, as well as Spitzer, SCUBA, AzTEC and MAMBO. We also explore the properties of an L(IR)-matched sample, designed to reveal evolution of q(IR) with z, spanning log L(IR) = 11-12 L(sun) and z=0-2, by stacking into the radio and far-IR images. For 1.4-GHz-selected galaxies, we see tentative evidence of a break in the flux ratio, q(IR), at L(1.4GHz) ~ 10^22.7 W/Hz, where AGN are starting to dominate the radio power density, and of weaker correlations with z and T(d). From our 250-um-selected sample we identify a small number of far-IR-bright outliers, and see trends of q(IR) with L(1.4GHz), L(IR), T(d) and z, noting that some of these are inter-related. For our L(IR)-matched sample, there is no evidence that q(IR) changes significantly as we move back into the epoch of galaxy formation: we find q(IR) goes as (1+z)^gamma, where gamma = -0.04 +/- 0.03 at z=0-2; however, discounting the least reliable data at z<0.5 we find gamma = -0.26 +/- 0.07, modest evolution which may be related to the radio background seen by ARCADE2, perhaps driven by <10uJy radio activity amongst ordinary star-forming galaxies at z>1. |
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| 1 : | Royal Observatory Edinburgh |
| Royal Observatory Edinburgh | |
| 2 : | Institut d'astrophysique spatiale (IAS) |
| CNRS : UMR8617 – INSU – Université Paris XI - Paris Sud | |
| 3 : | Autres |
| AUTRE | |
| 4 : | Astrophysics |
| CEA | |
| 5 : | XMM-Newton Science Operations Centre |
| European Space Agency | |
| 6 : | Laboratoire d'Astrophysique de Marseille (LAM) |
| CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I | |
| 7 : | Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA) |
| CEA : DSM/DAPNIA | |
| 8 : | Department of Astronomy and Astrophysics |
| University of Toronto | |
| 9 : | Station de Pathologie Végétale |
| Institut national de la recherche agronomique (INRA) | |
| 10 : | Laboratoire Colloïdes et Matériaux Divisés (LCMD) |
| CNRS : UMR7195 – ESPCI ParisTech | |
| 11 : | Max Planck Institute for Extraterrestrial Physics (MPE) |
| MPE - Garching | |
| 12 : | Department of Physics [Berkeley] |
| University of California, Berkeley | |
| 13 : | School of Physics & Astronomy |
| Cardiff University | |
| 14 : | Division of Engineering |
| Colorado School of Mines | |
| 15 : | Max-Planck-Institut für extraterrestrische Physik |
| Max-Planck-Institut | |
| 16 : | Service de Chimie Physique (SCP) |
| CEA : DEN/DPC/SCP | |
| 17 : | Science et Ingénierie des Matériaux et Procédés (SIMAP) |
| CNRS : UMR5266 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG) | |
| 18 : | Laboratoire de photonique et de nanostructures (LPN) |
| CNRS : UPR20 | |
| 19 : | Centre de recherches Paul Pascal (CRPP) |
| CNRS : UPR8641 | |
| 20 : | Institut d'Astrophysique de Paris (IAP) |
| CNRS : UMR7095 – INSU – Université Pierre et Marie Curie [UPMC] - Paris VI | |
| 21 : | National Radio Astronomy Observatory (NRAO) |
| NRAO | |
| 22 : | Department of Chemistry and Biochemistry |
| University of California at Los Angeles | |
| 23 : | National Institute of Water and Atmospheric Research |
| National Institute of Water and Atmospheric Research | |
| 24 : | Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA) |
| CNRS : UMR5509 – Université Claude Bernard - Lyon I – Ecole Centrale de Lyon – Institut National des Sciences Appliquées (INSA) - Lyon | |
| 25 : | British Antarctic Survey (BAS) |
| Natural Environment Research Council | |
| 26 : | GoLP/Instituto Plasmas e Fusa˜o Nuclear |
| Instituto Superior Tecnico de Lisboa | |
| 27 : | Laboratoire de Mathématiques Raphaël Salem (LMRS) |
| CNRS : UMR6085 – Université de Rouen | |
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| Domaine | : | Planète et Univers/Astrophysique/Astrophysique galactique Physique/Astrophysique/Astrophysique galactique |
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| Lien vers le texte intégral : |
| hal-00662135, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00662135 | |
| oai:hal.archives-ouvertes.fr:hal-00662135 | |
| Contributeur : Catherine Beaussier | |
| Soumis le : Lundi 23 Janvier 2012, 12:14:04 | |
| Dernière modification le : Lundi 30 Janvier 2012, 10:24:08 | |