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The European Large Area ISO Survey – III. 90-μm extragalactic source counts

Authors:	Andreas Efstathiou Seb Oliver Michael Rowan-Robinson C Surace T Sumner P Héraudeau M J D Linden-Vørnle D Rigopoulou S Serjeant R G Mann C J Cesarsky L Danese A Franceschini R Genzel A Lawrence D Lemke R G McMahon G Miley J-L Puget B Rocca-Volmerange

Institution:	Astrophysics Group, Blackett Laboratory, Imperial College of Science Technology &Medicine, Prince Consort Road, London SW7 2BZ;Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QJ;Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117, Heidelberg, Germany;Danish Space Research Institute, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark;Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany;CEA/SACLAY, 91191 Gif sur Yvette cedex, France;SISSA, International School for Advanced Studies, Via Beirut 2-4, 34014 Trieste, Italy;Dipartimento di Astronomia, Universitàdi Padova, Vicolo Osservatorio 5, I-35122 Padova, Italy;Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ;Institute of Astronomy, The Observatories, Madingley Road, Cambridge CB3 0HA;Leiden Observatory, PO Box 9513, NL-2300 RA Leiden, the Netherlands;Institut d'Astrophysique Spatiale, Bâtiment 121, UniversitéParis XI, 91405 Orsay cedex, France;Institut d'Astrophysique de Paris, 98bis Boulevard Arago, F 75014 Paris, France

Abstract:	We present results and source counts at 90 μm extracted from the preliminary analysis of the European Large Area ISO Survey (ELAIS). The survey covered about 12 deg² of the sky in four main areas and was carried out with the ISOPHOT instrument onboard the Infrared Space Observatory ( ISO ). The survey is at least an order of magnitude deeper than the IRAS 100-μm survey and is expected to provide constraints on the formation and evolution of galaxies. The majority of the detected sources are associated with galaxies on optical images. In some cases the optical associations are interacting pairs or small groups of galaxies, suggesting that the sample may include a significant fraction of luminous infrared galaxies. The source counts extracted from a reliable subset of the detected sources are in agreement with strongly evolving models of the starburst galaxy population.

Keywords:	surveys galaxies: evolution galaxies: formation galaxies: Seyfert galaxies: starburst infrared: galaxies

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