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Dust grain growth in the interstellar medium of 5 < z < 6.5 quasars

Michałowski, M. J. and Murphy, E. J. and Hjorth, J. and Watson, D. and Gall, C. and Dunlop, J. S. (2010) Dust grain growth in the interstellar medium of 5 < z < 6.5 quasars. Astronomy and Astrophysics, 522 . Art. No. A15. ISSN 0004-6361.

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Aims. We investigate whether stellar dust sources i.e. asymptotic giant branch (AGB) stars and supernovae (SNe) can account for dust detected in 5 < z < 6.5 quasars (QSOs). Methods. We calculate the required dust yields per AGB star and per SN using the dust masses of QSOs inferred from their millimeter emission and stellar masses approximated as the difference between the dynamical and the H_2 gas masses of these objects. Results. We find that AGB stars are not efficient enough to form dust in the majority of the z > 5 QSOs, whereas SNe may be able to account for dust in some QSOs. However, they require very high dust yields even for a top-heavy initial mass function. Conclusions. This suggests additional non-stellar dust formation mechanism e.g. significant dust grain growth in the interstellar medium of at least three out of nine z > 5 QSOs. SNe (but not AGB stars) may deliver enough heavy elements to fuel this growth.

Item Type:Article
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Murphy, E. J.0000-0001-7089-7325
Hjorth, J.0000-0002-4571-2306
Additional Information:© 2010 ESO. Received 30 April 2010, Accepted 28 June 2010, Published online 27 October 2010. We thank Joanna Baradziej, Karina Caputi, Eli Dwek and our anonymous referee for help with improving this paper. The Dark Cosmology Centre is funded by the Danish National Research Foundation.
Funding AgencyGrant Number
Danish National Research FoundationUNSPECIFIED
Subject Keywords:dust, extinction – galaxies: high-redshift – galaxies: ISM – submillimeter: galaxies – quasars: general
Record Number:CaltechAUTHORS:20110111-155057965
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Official Citation:Dust grain growth in the interstellar medium of 5 < z < 6.5 quasars M. J. Michałowski, E. J. Murphy, J. Hjorth, D. Watson, C. Gall and J. S. Dunlop A&A 522 A15 (2010) DOI: 10.1051/0004-6361/201014902
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21718
Deposited By: Benjamin Perez
Deposited On:12 Jan 2011 16:02
Last Modified:09 Mar 2020 13:19

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