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Most supermassive black hole growth is obscured by dust

Martínez-Sansigre, A. and Rawlings, S. and Lacy, M. and Fadda, D. and Marleau, F. R. and Simpson, C. and Willott, C. J. and Jarvis, M. J. (2006) Most supermassive black hole growth is obscured by dust. Astronomische Nachrichten, 327 (2-3). pp. 266-269. ISSN 0004-6337. doi:10.1002/asna.200510520.

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We present an alternative method to X-ray surveys for hunting down the high-redshift type-2 quasar population, using Spitzer and VLA data on the Spitzer First Look Survey. By demanding objects to be bright at 24 µm but faint at 3.6 µm, and combining this with a radio criterion, we find 21 type-2 radio-quiet quasar candidates at the epoch at which the quasar activity peaked. Optical spectroscopy with the WHT confirmed 10 of these objects to be type-2s with 1.4 ≤ z ≤ 4.2 while the rest are blank. There is no evidence for contamination in our sample, and we postulate that our 11 blank-spectrum candidates are obscured by kpc-scale dust as opposed to dust from a torus around the accretion disk. By carefully modelling our selection criteria, we conclude that, at high redshift, 50–80% of the supermassive black hole growth is obscured by dust.

Item Type:Article
Related URLs:
URLURL TypeDescription
Lacy, M.0000-0002-3032-1783
Fadda, D.0000-0002-3698-7076
Willott, C. J.0000-0002-4201-7367
Jarvis, M. J.0000-0001-7039-9078
Additional Information:© 2006 Wiley-VCH. Received 12 October 2005; accepted 15 November 2005; published online 20 February 2006. AMS, SR, ML, CS and MJJ would like to thank the organisers of the conference: Montse, Rosa, Enrique and Jose Luis for their kind hospitality. AMS would also like to thank the Council of the European Union for funding, and the Ministerio de Educaciόn y Ciencia for financial support for this conference. SR and CS would like to thank the UK PPARC for a Senior Research Fellowship and an Advanced Fellowship respectively.
Funding AgencyGrant Number
European Research Council (ERC)UNSPECIFIED
Ministerio de Educación y Ciencia (MEC)UNSPECIFIED
Subject Keywords: galaxies: active; galaxies: nuclei; quasars: general
Issue or Number:2-3
Record Number:CaltechAUTHORS:20110722-102417306
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Official Citation:Most supermassive black hole growth is obscured by dust (pages 266–269) A. Martínez-Sansigre, S. Rawlings, M. Lacy, D. Fadda, F. R. Marleau, C. Simpson, C. J. Willott and M. J. Jarvis Article first published online: 3 FEB 2006 | DOI: 10.1002/asna.200510520
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24505
Deposited By: Ruth Sustaita
Deposited On:22 Jul 2011 20:32
Last Modified:09 Nov 2021 16:24

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