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25 April 2024

» arxiv » astro-ph/0609466

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Far-infrared characterization of an ultra-luminous starburst associated with a massively-accreting black hole at z=1.15
E. Le Floc’h ; C. N. A. Willmer ; K. Noeske ; N. P. Konidaris ; E. S. Laird ; D. C. Koo ; K. Nandra ; K. Bundy ; S. Salim ; R. Maiolino ; C. J. Conselice ; J. M. Lotz ; C. Papovich ; J. D. Smith ; L. Bai ; A. L. Coil ; P. Barmby ; M. L. N. Ashby ; J.-S. Huang ; M. Blaylock ; G. Rieke ; J. A. Newman ; R. Ivison ; S. Chapman ; H. Dole ; E. Egami ; D. Elbaz ;
Date:	17 Sep 2006
Abstract:	As part of the "All Wavelength Extended Groth Strip International Survey" (AEGIS), we describe the panchromatic characterization of an X-ray luminous active galactic nucleus (AGN) in a merging galaxy at z=1.15. This object is detected at infrared (8mic, 24mic, 70mic, 160mic), submillimeter (850mic) and radio wavelengths, from which we derive a bolometric luminosity L_bol ~ 9x10^12 Lsol. We find that the AGN clearly dominates the hot dust emission below 40mic but its total energetic power inferred from the hard X-rays is substantially less than the bolometric output of the system. About 50% of the infrared luminosity is indeed produced by a cold dust component that probably originates from enshrouded star formation in the host galaxy. In the context of a coeval growth of stellar bulges and massive black holes, this source might represent a ``transition’’ object sharing properties with both quasars and luminous starbursts. Study of such composite galaxies will help address how the star formation and disk-accretion phenomena may have regulated each other at high redshift and how this coordination may have participated to the build-up of the relationship observed locally between the masses of black holes and stellar spheroids.
Source:	arXiv, astro-ph/0609466
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