An over-massive black hole in a typical star-forming galaxy, 2 billion years after the Big Bang

Trakhtenbrot, B. and Urry, C. M. and Civano, F. and Rosario, D. J. and Elvis, M. and Schawinski, K. and Suh, H. and Bongiorno, A. and Simmons, B. D. (2015) An over-massive black hole in a typical star-forming galaxy, 2 billion years after the Big Bang. Science, 349 (6244). pp. 168-171. ISSN 0036-8075

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Abstract

Supermassive black holes (SMBHs) and their host galaxies are generally thought to coevolve, so that the SMBH achieves up to about 0.2 to 0.5% of the host galaxy mass in the present day. The radiation emitted from the growing SMBH is expected to affect star formation throughout the host galaxy. The relevance of this scenario at early cosmic epochs is not yet established. We present spectroscopic observations of a galaxy at redshift z = 3.328, which hosts an actively accreting, extremely massive BH, in its final stages of growth. The SMBH mass is roughly one-tenth the mass of the entire host galaxy, suggesting that it has grown much more efficiently than the host, contrary to models of synchronized coevolution. The host galaxy is forming stars at an intense rate, despite the presence of a SMBH-driven gas outflow.

Item Type:
Journal Article
Journal or Publication Title:
Science
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1000
Subjects:
ID Code:
127629
Deposited By:
Deposited On:
20 Sep 2018 10:04
Refereed?:
Yes
Published?:
Published
Last Modified:
26 May 2020 07:10