Effects of spin on high-energy radiation from accreting black holes

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dc.contributor.author O'Riordan, Michael
dc.contributor.author Pe'er, Asaf
dc.contributor.author McKinney, Jonathan C.
dc.date.accessioned 2016-12-02T12:43:23Z
dc.date.available 2016-12-02T12:43:23Z
dc.date.issued 2016-11-01
dc.identifier.citation O' Riordan, M., Pe'er, A. and McKinney, J. C. (2016) ‘Effects of spin on high-energy radiation from accreting black holes’, The Astrophysical Journal, 831 (62), pp. 1-11. doi: 10.3847/0004-637X/831/1/62 en
dc.identifier.volume 831 en
dc.identifier.issued 62 en
dc.identifier.startpage 1 en
dc.identifier.endpage 11 en
dc.identifier.issn 0004-637X
dc.identifier.uri http://hdl.handle.net/10468/3346
dc.identifier.doi 10.3847/0004-637X/831/1/62
dc.description.abstract Observations of jets in X-ray binaries show a correlation between radio power and black hole spin. This correlation, if confirmed, points toward the idea that relativistic jets may be powered by the rotational energy of black holes. In order to examine this further, we perform general relativistic radiative transport calculations on magnetically arrested accretion flows, which are known to produce powerful jets via the Blandfordâ Znajek (BZ) mechanism. We find that the X-ray and γ-ray emission strongly depend on spin and inclination angle. Surprisingly, the high-energy power does not show the same dependence on spin as the BZ jet power, but instead can be understood as a redshift effect. In particular, photons observed perpendicular to the spin axis suffer little net redshift until originating from close to the horizon. Such observers see deeper into the hot, dense, highly magnetized inner disk region. This effect is largest for rapidly rotating black holes due to a combination of frame dragging and decreasing horizon radius. While the X-ray emission is dominated by the near horizon region, the near-infrared (NIR) radiation originates at larger radii. Therefore, the ratio of X-ray to NIR power is an observational signature of black hole spin. en
dc.description.sponsorship Irish Research Council (Grant Number GOIPG/2013/315); NASA/NSF/TCAN (NNX14AB46G); NSF/XSEDE/TACC (TGPHY120005); NASA/Pleiades (SMD-14-5451). en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher IOP Publishing en
dc.rights © 2016. The American Astronomical Society. All rights reserved. en
dc.subject Accretion en
dc.subject Accretion disks en
dc.subject Black hole physics en
dc.subject Radiative transfer en
dc.subject Relativistic processes en
dc.subject X-rays: binaries en
dc.title Effects of spin on high-energy radiation from accreting black holes en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Asaf Pe'er, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: a.peer@ucc.ie en
dc.internal.availability Full text available en
dc.date.updated 2016-12-02T12:16:32Z
dc.description.version Published Version en
dc.internal.rssid 355792912
dc.contributor.funder Irish Research Council en
dc.contributor.funder Seventh Framework Programme en
dc.contributor.funder National Aeronautics and Space Administration en
dc.contributor.funder National Science Foundation en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Astrophysical Journal en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.IRISemailaddress a.peer@ucc.ie en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/618499/EU/Transient-Sky/TRANSIENT-SKY en


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