Volume 381, Number 1, JanuaryI 2002
|Page(s)||L1 - L4|
|Published online||15 January 2002|
Letter to the Editor
ISOCAM mid-infrared detection of HR 10: A distant clone of Arp 220 at = 1.44
CEA Saclay/DSM/DAPNIA/Service d'Astrophysique, Orme des Merisiers, 91191 Gif-sur-Yvette Cedex, France
2 Department of Physics, University of California, Santa Cruz, CA 95064, USA
3 Department of Astronomy & Astrophysics, University of California, Santa Cruz, CA 95064, USA
4 Instituto de Astronomía y Física del Espacio, CONICET, 1428 Ciudad Universitaria, Buenos Aires, Argentina
5 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, 96822 Honolulu, USA
6 European Southern Observatory, Karl-Schwarzchild-Strasse 2, 85748 Garching bei München, Germany
Corresponding author: D. Elbaz, firstname.lastname@example.org
Accepted: 30 October 2001
We report the detection of the extremely red object (ERO), HR 10 (, ), at 4.9 and 6.1 μm (rest-frame) with ISOCAM, the mid-infrared (MIR) camera onboard the Infrared Space Observatory (ISO). HR 10 is the first ERO spectroscopically identified to be associated with an ultra-luminous IR galaxy (ULIG) detected in the radio, MIR and sub-millimeter. The rest-frame spectral energy distribution (SED) of HR 10 is amazingly similar to the one of Arp 220, scaled by a factor . The corresponding 8–1000 μm luminosity (~710) translates into a star formation rate of about yr-1 if HR 10 is mostly powered by star formation. We address the key issue of the origin of the powerful luminosity of HR 10, i.e. starburst versus active galactic nucleus (AGN), by using the similarity with its closeby clone, Arp 220.
Key words: galaxies: evolution / infrared: galaxies
© ESO, 2002
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