The European Large Area ISO Survey - VI. Discovery of a new hyperluminous infrared galaxy
English
Morel, Thierry[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ > > > >]
Efstathiou, A.[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ]
Serjeant, S.[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ ; Unit for Space Sciences and Astrophysics, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NR]
Surace, C.[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ]
Verma, A.[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ ; Max-Planck-Institut für Extraterrestrische Physik, Postfach 1312, D-85741 Garching, Germany]
Oliver, S.[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ ; Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QJ]
Rowan-Robinson, M.[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ]
Georgantopoulos, I.[Astronomical Institute, National Observatory of Athens, Lofos Koufou, Palaia Penteli, Athens, GR-15236, Greece]
Farrah, D.[Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London SW7 2BZ]
Alexander, D. M.[SISSA, International School for Advanced Studies, Via Beirut 2-4, 34014 Trieste, Italy ; Pennsylvania State University, Astronomy and Astrophysics, Davey Laboratory, University Park, PA 16802, USA]
Willott, C. J.[Astrophysics, Department of Physics, Keble Road, Oxford OX1 3RH]
Cabrera-Guerra, F.[Instituto de AstrofÃsica de Canarias, Via Lactea, 38200 La Laguna, Tenerife, Canary Islands, Spain]
Gonzalez-Solares, E. A.[Instituto de AstrofÃsica de Canarias, Via Lactea, 38200 La Laguna, Tenerife, Canary Islands, Spain]
Cabrera-Lavers, A.[Instituto de AstrofÃsica de Canarias, Via Lactea, 38200 La Laguna, Tenerife, Canary Islands, Spain]
Gonzalez-Serrano, J. I.[Instituto de AstrofÃsica de Canarias, Via Lactea, 38200 La Laguna, Tenerife, Canary Islands, Spain ; Instituto de FÃsica de Cantabria (CSIC - Univ. de Cantabria), Facultad de Ciencias, Univ. de Cantabria, 39005 Santander, Spain]
Ciliegi, P.[Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy]
Pozzi, F.[Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy]
Matute, I.[Dipartimento di Fisica, Universita degli Studi ``Roma TRE'', Via della Vasca Navale 84, I-00146 Roma, Italy]
Flores, H.[CEA/SACLAY, 91191 Gif sur Yvette cedex, France]
[en] We report the discovery of the first hyperluminous infrared galaxy (HyLIG) in the course of the European Large Area ISO Survey (ELAIS). This object has been detected by ISO at 6.7, 15 and 90μm, and is found to be a broad-line, radio-quiet quasar at a redshift [formmu4]z=1.099. From a detailed multicomponent model fit of the spectral energy distribution, we derive a total IR luminosity L[SUB]IR[/SUB] [formmu5](1-1000μm)~1.0à 10[SUP]13[/SUP]h65-2L[SUB]solar[/SUB] [formmu6](q[SUB]0[/SUB]=0.5), and discuss the possible existence of a starburst contributing to the far-IR output. Observations to date present no evidence for lens magnification. This galaxy is one of the very few HyLIGs with a X-ray detection. On the basis of its soft X-ray properties, we suggest that this broad-line object may be the face-on analogue of narrow-line, Seyfert-like HyLIGs.
