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Article: The multiwavelength Doppler factors for a sample of gamma-ray loud blazars

TitleThe multiwavelength Doppler factors for a sample of gamma-ray loud blazars
Authors
KeywordsGalaxies: active
Galaxies: nuclei
Jets: radiation mechanism
Issue Date2002
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, 2002, v. 54 n. 2, p. 159-169 How to Cite?
AbstractThe high luminosity and rapid variability detected in γ-ray loud blazars imply that the beaming effect plays an important role in these sources. The Doppler factor, depending on two unobservable parameters (Lorentz factor and viewing angle), is very important for understanding the basic properties of blazars. Although the viewing angle is unobservable, increasing direct and indirect evidence has shown up to indicate that the jet is bent, and therefore the viewing angle also varies. In this sense, the Doppler factor, which is dependent on the viewing angle and the Lorentz factor, should also vary. In the present paper, using available data of blazars at different (radio, optical, X-ray, and γ-ray) wavebands and assuming that multi-waveband radiation is produced by the radiation of accelerated particles in a jet, we discuss the properties of the Doppler factors of blazars at different wavebands. Our results indicate that the Doppler factor of a blazar is a function of frequency. The Doppler factor decreases with frequency from radio to X-ray bands, but increases with frequency from X-ray to γ-ray bands. The γ-ray Doppler factors found in the present paper are correlated with those by Ghisellini et al. (1998, AAA070.159.155), suggesting that our estimation is reasonable. Furthermore, BL Lacertae objects are found to show lower Doppler factors and higher synchrotron peak frequencies compared with FSRQs; the promising TeV sources are BL Lacertae objects.
Persistent Identifierhttp://hdl.handle.net/10722/80469
ISSN
2015 Impact Factor: 1.961
2015 SCImago Journal Rankings: 0.804
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Len_HK
dc.contributor.authorFan, JHen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-06T08:06:48Z-
dc.date.available2010-09-06T08:06:48Z-
dc.date.issued2002en_HK
dc.identifier.citationPublications Of The Astronomical Society Of Japan, 2002, v. 54 n. 2, p. 159-169en_HK
dc.identifier.issn0004-6264en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80469-
dc.description.abstractThe high luminosity and rapid variability detected in γ-ray loud blazars imply that the beaming effect plays an important role in these sources. The Doppler factor, depending on two unobservable parameters (Lorentz factor and viewing angle), is very important for understanding the basic properties of blazars. Although the viewing angle is unobservable, increasing direct and indirect evidence has shown up to indicate that the jet is bent, and therefore the viewing angle also varies. In this sense, the Doppler factor, which is dependent on the viewing angle and the Lorentz factor, should also vary. In the present paper, using available data of blazars at different (radio, optical, X-ray, and γ-ray) wavebands and assuming that multi-waveband radiation is produced by the radiation of accelerated particles in a jet, we discuss the properties of the Doppler factors of blazars at different wavebands. Our results indicate that the Doppler factor of a blazar is a function of frequency. The Doppler factor decreases with frequency from radio to X-ray bands, but increases with frequency from X-ray to γ-ray bands. The γ-ray Doppler factors found in the present paper are correlated with those by Ghisellini et al. (1998, AAA070.159.155), suggesting that our estimation is reasonable. Furthermore, BL Lacertae objects are found to show lower Doppler factors and higher synchrotron peak frequencies compared with FSRQs; the promising TeV sources are BL Lacertae objects.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.subjectGalaxies: activeen_HK
dc.subjectGalaxies: nucleien_HK
dc.subjectJets: radiation mechanismen_HK
dc.titleThe multiwavelength Doppler factors for a sample of gamma-ray loud blazarsen_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-s2.0-0036379575en_HK
dc.identifier.hkuros68897en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036379575&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume54en_HK
dc.identifier.issue2en_HK
dc.identifier.spage159en_HK
dc.identifier.epage169en_HK
dc.publisher.placeJapanen_HK
dc.identifier.scopusauthoridZhang, L=9432987500en_HK
dc.identifier.scopusauthoridFan, JH=36779855200en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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