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

Benny Trakhtenbrot, C. Megan Urry, Francesca Civano, David J. Rosario, Martin Elvis, Kevin Schawinski, Hyewon Suh, Angela Bongiorno, Brooke D. Simmons

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)168-171
Number of pages4
JournalScience
Volume349
Issue number6244
DOIs
StatePublished - 10 Jul 2015
Externally publishedYes

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