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Article: Escape of TeV gamma rays from anisotropic thermal photon fields in active galactic nuclei

TitleEscape of TeV gamma rays from anisotropic thermal photon fields in active galactic nuclei
Authors
KeywordsAccretion, accretion disks
Galaxies: active
Gamma rays: theory
Issue Date1997
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 1997, v. 475 n. 2 PART I, p. 534-544 How to Cite?
AbstractWe calculate the optical depth of TeV γ-rays that result from the anisotropic IR-UV thermal radiation of the α-disk model proposed by Shakura & Sunyaev. Our calculations yield the dependences of the optical depth of high-energy γ-rays on the disk parameters (i.e., α, M8, and M26), photon energy, and Φ, the angle between the propagation direction and the rotation axis of the accretion disk. Our results indicate that TeV γ-rays can escape more easily from the central engine with lower values of & (≲0.01) and Φ. We conclude that the optical depth of TeV γ-rays in the anisotropic thermal radiation field places certain constraints on the possible values of the parameter a and the position of the emission region. © 1997. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/43193
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Len_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2007-03-23T04:41:03Z-
dc.date.available2007-03-23T04:41:03Z-
dc.date.issued1997en_HK
dc.identifier.citationAstrophysical Journal Letters, 1997, v. 475 n. 2 PART I, p. 534-544en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43193-
dc.description.abstractWe calculate the optical depth of TeV γ-rays that result from the anisotropic IR-UV thermal radiation of the α-disk model proposed by Shakura & Sunyaev. Our calculations yield the dependences of the optical depth of high-energy γ-rays on the disk parameters (i.e., α, M8, and M26), photon energy, and Φ, the angle between the propagation direction and the rotation axis of the accretion disk. Our results indicate that TeV γ-rays can escape more easily from the central engine with lower values of & (≲0.01) and Φ. We conclude that the optical depth of TeV γ-rays in the anisotropic thermal radiation field places certain constraints on the possible values of the parameter a and the position of the emission region. © 1997. The American Astronomical Society. All rights reserved.en_HK
dc.format.extent370732 bytes-
dc.format.extent12158 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsThe Astrophysical Journal. Copyright © University of Chicago Press.en_HK
dc.subjectAccretion, accretion disksen_HK
dc.subjectGalaxies: activeen_HK
dc.subjectGamma rays: theoryen_HK
dc.titleEscape of TeV gamma rays from anisotropic thermal photon fields in active galactic nucleien_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=475&issue=pt 1&spage=534&epage=544&date=1997&atitle=Escape+of+TeV+Gamma+Rays+from+Anisotropic+Thermal+Photon+Fields+in+Active+Galactic+Nucleien_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/303584en_HK
dc.identifier.scopuseid_2-s2.0-21744437403en_HK
dc.identifier.hkuros22307-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-21744437403&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume475en_HK
dc.identifier.issue2 PART Ien_HK
dc.identifier.spage534en_HK
dc.identifier.epage544en_HK
dc.identifier.isiWOS:A1997WE35500015-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhang, L=38762428100en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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