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Far-Infrared Characterization of an Ultraluminous Starburst Associated with a Massively Accreting Black Hole at z = 1.15

Le Floc'h, E. and Willmer, C. N. A. and Noeske, K. and Konidaris, N. P. and Laird, E. S. and Koo, D. C. and Nandra, K. and Bundy, K. and Salim, S. and Maiolino, R. and Conselice, C. J. and Lotz, J. M. and Papovich, C. and Smith, J. D. and Bai, L. and Coil, A. L. and Barmby, P. and Ashby, M. L. N. and Huang, J.-S. and Blaylock, M. and Rieke, G. and Newman, J. A. and Ivison, R. J. and Chapman, S. and Dole, H. and Egami, E. and Elbaz, D. (2007) Far-Infrared Characterization of an Ultraluminous Starburst Associated with a Massively Accreting Black Hole at z = 1.15. Astrophysical Journal Letters, 660 (1). L65-L68. ISSN 2041-8205. doi:10.1086/517916.

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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 (8, 24, 70, and 160 μm), submillimeter (850 μm), and radio wavelengths, from which we derive a bolometric luminosity Lbol ∼ 9 x 10^12 L☉. We find that the AGN clearly dominates the hot dust emission below 40 μm 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 in the buildup of the relationship observed locally between the masses of black holes and stellar spheroids.

Item Type:Article
Related URLs:
URLURL TypeDescription
Konidaris, N. P.0000-0003-1905-2815
Koo, D. C.0000-0003-3385-6799
Nandra, K.0000-0002-7150-9192
Bundy, K.0000-0001-9742-3138
Salim, S.0000-0003-2342-7501
Conselice, C. J.0000-0003-1949-7638
Lotz, J. M.0000-0003-3130-5643
Papovich, C.0000-0001-7503-8482
Smith, J. D.0000-0003-1545-5078
Barmby, P.0000-0003-2767-0090
Ashby, M. L. N.0000-0002-3993-0745
Rieke, G.0000-0003-2303-6519
Newman, J. A.0000-0001-8684-2222
Ivison, R. J.0000-0001-5118-1313
Elbaz, D.0000-0002-7631-647X
Additional Information:© 2007. The American Astronomical Society. Received 2006 May 22; accepted 2006 September 15; published 2007 April 12. We thank Roberto Gilli, Sandy Faber, and Puragra Guhathakurta for their careful reading of the manuscript and their valuable comments, as well as Jim Cadien, Dean Hines, and Jeroen Bouwman for their help in the data reduction. We are also particularly grateful to all AEGIS members for their contributions to the AEGIS database. This work is based on observations made with the Spitzer Space Telescope, which is operated by NASA/JPL/Caltech. Financial support was provided by NASA through contracts 1255094, 1256790, 1263690, 1263834, NNG04GC89G, and HST-GO-10314.18-A, by NASA/Caltech through the Spitzer Space Telescope Fellowship Program, as well as by NSF through contracts AST00-71198, AST00-71048, AST05-07428, and AST05-07483. A.L.C. and J.A.N. are supported by NASA through Hubble Fellowship grants HF-01182.01-A/HF-011065.01-A. We finally wish to recognize the significant cultural role that the summit of Maunea Kea has within the Hawaiian community.
Funding AgencyGrant Number
NASA Hubble FellowshipHF-01182.01-A
NASA Hubble FellowshipHF-011065.01-A
Subject Keywords:cosmology: observations—galaxies: high-redshift—infrared: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:FLOapjl07a
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12740
Deposited By: Archive Administrator
Deposited On:22 Dec 2008 17:52
Last Modified:08 Nov 2021 22:32

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