ISOCAM Mid-InfraRed Detection of HR 10: A Distant Clone of Arp 220 at z=1.44

Details ISOCAM Mid-InfraRed Detection of HR 10: A Distant Clone of Arp 220 at z=1.44 ISOCAM Mid-InfraRed Detection of HR 10: A Distant Clone of Arp 220 at z=1.44

2001-11-13

arxiv.org/abs/astro-ph/0111243v1

Astron.Astrophys. 381 (2002) L1-L4

Astronomy and Astrophysics

Astrophysics

accepted for publication in Astronomy and Astrophysics Letter (4 pages, 2 figures)

Scientific paper

10.1051/0004-6361:20011520

We report the detection of the extremely red object (ERO), HR 10 (I-K= 6.5, z=1.44), at 4.9 and 6.1 microns (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 3.8+/-1.3. The corresponding 8-1000 microns luminosity (~ 7x10^12 h70^{-2} Lsol) translates into a star formation rate of about 1200 h70^{-2} Msol/yr 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.

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