High energy radiation from jets and accretion disks near rotating 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.contributor.editor Aharonian, Felix A.
dc.contributor.editor Hofmann, Werner
dc.contributor.editor Rieger, Frank M.
dc.date.accessioned 2017-05-12T09:50:33Z
dc.date.available 2017-05-12T09:50:33Z
dc.date.issued 2017-01
dc.identifier.citation O’Riordan, M., Pe’er, A. and McKinney, J.C. (2017) ‘High energy radiation from jets and accretion disks near rotating black holes’, AIP Conference Proceedings 1792, 040042, (6pp). doi: 10.1063/1.4968946 en
dc.identifier.volume 1792 en
dc.identifier.startpage 1 en
dc.identifier.endpage 6 en
dc.identifier.issn 0094-243X
dc.identifier.uri http://hdl.handle.net/10468/3952
dc.identifier.doi 10.1063/1.4968946
dc.description.abstract We model the low/hard state in X-ray binaries as a magnetically arrested accretion flow, and calculate the resulting radiation using a general-relativistic radiative transport code. Firstly, we investigate the origin of the high-energy emission. We find the following indications of a significant jet contribution at high energies: (i) a pronounced γ-ray peak at ∼ 1023 Hz, (ii) a break in the optical/UV band where the spectrum changes from disk to jet dominated, and (iii) a low-frequency synchrotron peak ≲ 1014 Hz implies that a significant fraction of any observed X-ray and γ-ray emission originates in the jet. Secondly, we investigate the effects of black hole spin on the high-energy emission. We find that the X-ray and γ-ray power depend strongly on spin and inclination angle. Surprisingly, this dependence is not a result of the Blandford-Znajek mechanism, but instead can be understood as a redshift effect. For rapidly rotating black holes, observers with large inclinations see deeper into the hot, dense, highly-magnetized inner regions of the accretion flow. Since the lower frequency emission originates at larger radii, it is not significantly affected by the spin. Therefore, the ratio of the X-ray to near-infrared power is an observational probe of black hole spin. en
dc.description.sponsorship Irish Research Council (Grant Number GOIPG/2013/315); National Aeronautics and Space Administration/National Science Foundation/Theoretical and Computational Astrophysics Networks (TCAN)(NNX14AB46G); National Science Foundation/ The Extreme Science and Engineering Discovery Environment/ Texas Advanced Computing Center (TGPHY120005); National Aeronautics and Space Administration/ Pleiades (SMD-14-5451) en
dc.description.uri https://www.mpi-hd.mpg.de/hd2016/pages/news.php en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Institute of Physics Publishing en
dc.relation.ispartof 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma2016)
dc.rights © 2017, the Authors. Reproduced with the permission of AIP Publishing from AIP Conference Proceedings 1792, 040042 (2017); doi: 10.1063/1.4968946 en
dc.subject Spin en
dc.subject Black hole en
dc.subject Radiation en
dc.subject Emission en
dc.title High energy radiation from jets and accretion disks near rotating black holes en
dc.type Conference item 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.check.info Access to this paper is restricted until 12 months after publication by request of the publisher. en
dc.check.date 2018-01-01
dc.date.updated 2017-05-12T09:03:04Z
dc.description.version Published Version en
dc.internal.rssid 394743257
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 AIP Conference Proceedings en
dc.internal.copyrightchecked Yes en
dc.internal.licenseacceptance Yes en
dc.internal.conferencelocation Heidelberg, Germany en
dc.internal.IRISemailaddress a.peer@ucc.ie en
dc.identifier.articleid 040042
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/618499/EU/Transient-Sky/TRANSIENT-SKY

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