GALAXIES: INFRARED: COLORS; GALAXIES: SURVEYS; GALAXIES: STARBURSTS; ACTIVE
Abstract :
[en] We present the properties of all the galaxies detected by ISO at 7, 15 and 90 microns in ELAIS northern fields. The spectral energy distribution (SED) of those 20 galaxies with IRAS detections can generally be well fitted by a predominant cirrus component plus a modest starburst contribution. Follow-up spectroscopy has shown that all the objects are emission-line galaxies but without a very intense star formation event. Most of the galaxies analyzed by means of optical R band photometry result to host an important exponential disk component, in good agreement with the SED IR modelling. We note that galaxies with morphological signs of perturbations seem to show slightly higher f[SUB]15[/SUB]/f[SUB]6.7[/SUB] ratios, indicating that star formation could be more important in them. One of the objects is a broad-line, radio-quiet quasar at z=1.099; its spectral energy distribution indicates that it is a hyperluminous infrared galaxy (HLIG), the first HLIG detected in the ELAIS areas.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Marquez, I.
Masegosa, J.; Instituto de AstrofÃsica de AndalucÃa, Apdo 3004, 18080 Granada (Spain)
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, UK
Verma, A.; Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London, SW7 2BZ, UK
Vaisanen, P.; Observatory, P.O. Box 14, Tahtitorninmaki, FIN-00014, University of Helsinki, Finland
Alexander, D.; SISSA, International School for Advanced Studies, Via Beirut 2-4, 34014 Trieste, Italy
Heraudeau, P.
Surace, C.; Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London, SW7 2BZ, UK
Perez-Fournon, I.
Cabrera-Guerra, F.; Instituto de AstrofÃsica de Canarias, VÃa Láctea s/n, 38200 La Laguna, Tenerife, Canary Islands, Spain
Gonzalez-Serrano, J. I.
Gonzalez-Solares, E. A.
Serjeant, S.; Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London, SW7 2BZ, UK
Oliver, S. J.; Astronomy Center, University of Sussex, Falmer, Brighton, BN1 9QJ, UK
Rowan-Robinson, M.; Astrophysics Group, Imperial College of Science, Technology and Medicine, Blackett Laboratory, Prince Consort Road, London, SW7 2BZ, UK
