Herschel-Astrophysical Terahertz Large Area Survey: detection of a far-infrared population around galaxy clusters★
| Autor: | K. E. K. Coppin, J. E. Geach, Ian Smail, L. Dunne, A. C. Edge, R. J. Ivison, S. Maddox, R. Auld, M. Baes, S. Buttiglione, A. Cava, D. L. Clements, A. Cooray, A. Dariush, G. De Zotti, S. Dye, S. Eales, J. Fritz, R. Hopwood, E. Ibar, M. Jarvis, M. J. Michałowski, D. N. A. Murphy, M. Negrello, E. Pascale, M. Pohlen, E. Rigby, G. Rodighiero, D. Scott, S. Serjeant, D. J. B. Smith, P. Temi, P. van der Werf |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
education.field_of_study Active galactic nucleus 010308 nuclear & particles physics Star formation Population Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Radius Astrophysics 01 natural sciences Galaxy Far infrared Space and Planetary Science 0103 physical sciences Cluster (physics) education 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy cluster |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. |
| ISSN: | 0035-8711 |
| DOI: | 10.1111/j.1365-2966.2011.19084.x |
| Popis: | We report the detection of a significant excess in the surface density of far-infrared sources from the Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) within ∼ 1 Mpc of the centres of 66 optically-selected clusters of galaxie s in the SDSS with hzi ∼0.25. From the analysis of the multiwavelength properties of their cou nterparts we conclude that the farinfrared emission is associated with dust-obscured star fo rmation and/or active galactic nuclei within galaxies in the clusters themselves. The excess reaches a maximum at a radius of ∼ 0.8 Mpc, where we find 1.0±0.3 S250 >34 mJy sources on average per cluster above what would be expected for random field locations. If the far-infr ared emission is dominated by star formation (as opposed to AGN) then this corresponds to an average star formation rate of ∼7 M⊙ yr −1 per cluster in sources with LIR > 5×10 10 L⊙. Although lensed sources make a negligible contribution to the excess signal, a fraction of the sources around the clusters could be gravitationally lensed, and we have identified a sample of potential cases of cluster-lensed Herschel sources that could be targeted in follow-up studies. |
| Databáze: | OpenAIRE |
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