Black hole - galaxy correlations without self-regulation

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dc.contributor.authorAngles-Alcazar, Daniel
dc.contributor.authorOzel, Feryal
dc.contributor.authorDave, Romeel
dc.date.accessioned2016-04-19T20:36:07Z
dc.date.available2016-04-19T20:36:07Z
dc.date.issued2013
dc.description.abstractRecent models of black hole growth in a cosmological context have forwarded a paradigm in which the growth is self-regulated by feedback from the black hole itself. Here we use cosmological zoom simulations of galaxy formation down to z =2 to show that such strong self-regulation is required in the popular spherical Bondi accretion model, but that a plausible alternative model in which black hole growth is limited by galaxy-scale torques does not require self-regulation. Instead, this torque-limited accretion model yields black holes and galaxies evolving on average along the observed scaling relations by relying only on a fixed, 5% mass retention rate onto the black hole from the radius at which the accretion flow is fed. Feedback from the black hole may (and likely does) occur, but does not need to couple to galaxy-scale gas in order to regulate black hole growth. We show that this result is insensitive to variations in the initial black hole mass, stellar feedback, or other implementation details. The torque-limited model allows for high accretion rates at very early epochs (unlike the Bondi case), which if viable can help explain the rapid early growth of black holes, while by z ∼ 2 it yields Eddington factors of ∼1%–10%. This model also yields a less direct correspondence between major merger events and rapid phases of black hole growth. Instead, growth is more closely tied to cosmological disk feeding, which may help explain observational studies showing that, at least at z >~ 1, active galaxies do not preferentially show merger signatures.en_US
dc.description.accreditationWeb of Scienceen_US
dc.identifier.citationAngles-Alcazar, D. et al. (2013). Black hole - galaxy correlations without self-regulation. Astrophysical Journal, 770(5): 1-18en_US
dc.identifier.issn1538-4357
dc.identifier.urihttp://hdl.handle.net/10566/2126
dc.identifier.urihttp://dx.doi.org/10.1088/0004-637X/770/1/5
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherAmerican Astronomical Societyen_US
dc.rightsAAS grants back to authors the non-exclusive right of republication, subject only to giving appropriate credit to the journal in which the article was published. This non-exclusive right of republication gives authors the right to approve or deny reproduction of all or part of the article and to post the final published version online.
dc.status.ispeerreviewedtrue
dc.subjectBlack hole physicsen_US
dc.subjectGalaxiesen_US
dc.subjectQuasarsen_US
dc.subjectGalaxies evolutionen_US
dc.titleBlack hole - galaxy correlations without self-regulationen_US
dc.typeArticleen_US

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