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Stellar and Quasar Feedback in Concert: Effects on AGN Accretion, Obscuration, and Outflows

Hopkins, Philip F. and Torrey, Paul and Faucher-Giguère, Claude-André and Quataert, Eliot and Murray, Norman (2016) Stellar and Quasar Feedback in Concert: Effects on AGN Accretion, Obscuration, and Outflows. Monthly Notices of the Royal Astronomical Society, 458 (1). pp. 816-831. ISSN 0035-8711.

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We study the interaction of feedback from active galactic nuclei (AGN) and a multiphase interstellar medium (ISM), in simulations including explicit stellar feedback, multiphase cooling, accretion-disc winds, and Compton heating. We examine radii ∼0.1–100 pc around a black hole (BH), where the accretion rate on to the BH is determined and where AGN-powered winds and radiation couple to the ISM. We conclude: (1) the BH accretion rate is determined by exchange of angular momentum between gas and stars in gravitational instabilities. This produces accretion rates ∼0.03–1 M_⊙ yr^(−1), sufficient to power luminous AGN. (2) The gas disc in the galactic nucleus undergoes an initial burst of star formation followed by several million years where stellar feedback suppresses the star formation rate (SFR). (3) AGN winds injected at small radii with momentum fluxes ∼L_(AGN)/c couple efficiently to the ISM and have dramatic effects on ISM properties within ∼100 pc. AGN winds suppress the nuclear SFR by factors ∼10–30 and BH accretion rate by factors ∼3–30. They increase the outflow rate from the nucleus by factors ∼10, consistent with observational evidence for galaxy-scale AGN-driven outflows. (4) With AGN feedback, the predicted column density distribution to the BH is consistent with observations. Absent AGN feedback, the BH is isotropically obscured and there are not enough optically thin sightlines to explain type-I AGN. A ‘torus-like’ geometry arises self-consistently as AGN feedback evacuates gas in polar regions.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hopkins, Philip F.0000-0003-3729-1684
Torrey, Paul0000-0002-5653-0786
Faucher-Giguère, Claude-André0000-0002-4900-6628
Quataert, Eliot0000-0001-9185-5044
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 February 3. Received 2016 February 3. In original form 2015 April 10. First published online February 9, 2016. We thank Todd Thompson for helpful discussions, and the anonymous referee for helpful suggestions. Support for PFH was provided by the Gordon and Betty Moore Foundation through Grant #776 to the Caltech Moore Center for Theoretical Cosmology and Physics, an Alfred P. Sloan Research Fellowship, NASA ATP Grant NNX14AH35G, and NSF Collaborative Research Grant #1411920. Numerical calculations were run on the Caltech compute cluster ‘Zwicky’ (NSF MRI award #PHY-0960291) and allocation TG-AST130039 granted by the Extreme Science and Engineering Discovery Environment (XSEDE) supported by the NSF. EQ is supported in part by NASA ATP Grant 12-ATP12-0183, the David and Lucile Packard Foundation, and a Simons Investigator Award from the Simons Foundation. CAFG was supported by a fellowship from the Miller Institute for Basic Research in Science, by NASA through Einstein Postdoctoral Fellowship Award PF3-140106 and grant 10-ATP10-0187, by NSF through grant AST-1412836, and by Northwestern University funds.
Group:Moore Center for Theoretical Cosmology and Physics
Funding AgencyGrant Number
Gordon and Betty Moore Foundation776
Alfred P. Sloan FoundationUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Simons FoundationUNSPECIFIED
Miller Institute for Basic Research in ScienceUNSPECIFIED
NASA Einstein FellowshipPF3-140106
Northwestern UniversityUNSPECIFIED
Subject Keywords:galaxies: formation, galaxies: evolution, galaxies: active, star formation: general, cosmology: theory
Issue or Number:1
Record Number:CaltechAUTHORS:20150422-112435004
Persistent URL:
Official Citation:Philip F. Hopkins, Paul Torrey, Claude-André Faucher-Giguère, Eliot Quataert, and Norman Murray Stellar and quasar feedback in concert: effects on AGN accretion, obscuration, and outflows MNRAS (May 01, 2016) Vol. 458 816-831 doi:10.1093/mnras/stw289 first published online February 9, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56877
Deposited By: Ruth Sustaita
Deposited On:22 Apr 2015 18:55
Last Modified:09 Mar 2020 13:18

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