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Article: Transient optical emission from a nonstationary accretion disk: A model for optical afterglow of gamma ray bursts

TitleTransient optical emission from a nonstationary accretion disk: A model for optical afterglow of gamma ray bursts
Authors
KeywordsAccretion disk: Instability
Black holes
Galaxies
Gamma-ray bursts
Radiation mechanism
Issue Date2000
PublisherNihon Tenmon Gakkai. The Journal's web site is located at http://www.asj.or.jp/pasj/
Citation
Publications Of The Astronomical Society Of Japan, 2000, v. 52 n. 4, p. 711-723 How to Cite?
AbstractWe consider the time-dependent behavior of nonstationary accretion disk which is formed by the capture and disruption of a main-sequence star around a massive black hole. If an instability is developed in the inner edge of the nonstationary disk and produces a strong magnetic field, a large amount of the black hole rotational energy can be extracted via the Blandford-Znajek process, which results in a Gamma-Ray Burst (GRB) with a typical duration ∼ 10-102 s. Other parameters related to a typical GRB including burst energy, rise time of the burst, number of sub-burst etc are also estimated. The vertical structure and thermal stability properties of the disk are investigated in detail. In the early stage of forming transient accretion disk, the material supplied by the tidally disrupted star is clumped in the relatively cool disk. This eventually leads to a thermal instability, which results in an increase of the viscosity of the disk. As the instability propagates across the disk, the stability of a time-dependent disk and variability of the mass-deposition rate provide a possible explanation for transient optical emission. We speculate that this transient optical emission from a nonstationary accretion disk may relate to the behavior of GRB optical afterglow, and the transient optical afterglow can be reproduced if one takes into account the effect of an evolving viscous parameter, α.
Persistent Identifierhttp://hdl.handle.net/10722/80723
ISSN
2015 Impact Factor: 1.961
2015 SCImago Journal Rankings: 0.804
References

 

DC FieldValueLanguage
dc.contributor.authorLu, Yen_HK
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorZhao, Gen_HK
dc.date.accessioned2010-09-06T08:09:35Z-
dc.date.available2010-09-06T08:09:35Z-
dc.date.issued2000en_HK
dc.identifier.citationPublications Of The Astronomical Society Of Japan, 2000, v. 52 n. 4, p. 711-723en_HK
dc.identifier.issn0004-6264en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80723-
dc.description.abstractWe consider the time-dependent behavior of nonstationary accretion disk which is formed by the capture and disruption of a main-sequence star around a massive black hole. If an instability is developed in the inner edge of the nonstationary disk and produces a strong magnetic field, a large amount of the black hole rotational energy can be extracted via the Blandford-Znajek process, which results in a Gamma-Ray Burst (GRB) with a typical duration ∼ 10-102 s. Other parameters related to a typical GRB including burst energy, rise time of the burst, number of sub-burst etc are also estimated. The vertical structure and thermal stability properties of the disk are investigated in detail. In the early stage of forming transient accretion disk, the material supplied by the tidally disrupted star is clumped in the relatively cool disk. This eventually leads to a thermal instability, which results in an increase of the viscosity of the disk. As the instability propagates across the disk, the stability of a time-dependent disk and variability of the mass-deposition rate provide a possible explanation for transient optical emission. We speculate that this transient optical emission from a nonstationary accretion disk may relate to the behavior of GRB optical afterglow, and the transient optical afterglow can be reproduced if one takes into account the effect of an evolving viscous parameter, α.en_HK
dc.languageengen_HK
dc.publisherNihon Tenmon Gakkai. The Journal's web site is located at http://www.asj.or.jp/pasj/en_HK
dc.relation.ispartofPublications of the Astronomical Society of Japanen_HK
dc.subjectAccretion disk: Instabilityen_HK
dc.subjectBlack holesen_HK
dc.subjectGalaxiesen_HK
dc.subjectGamma-ray burstsen_HK
dc.subjectRadiation mechanismen_HK
dc.titleTransient optical emission from a nonstationary accretion disk: A model for optical afterglow of gamma ray burstsen_HK
dc.typeArticleen_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0034344920en_HK
dc.identifier.hkuros55904en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034344920&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume52en_HK
dc.identifier.issue4en_HK
dc.identifier.spage711en_HK
dc.identifier.epage723en_HK
dc.publisher.placeJapanen_HK
dc.identifier.scopusauthoridLu, Y=7405476987en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridZhao, G=7403296400en_HK

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