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Article: Gamma-Ray and Multi-Wave Band Emission from Gamma-Ray-loud Blazars

TitleGamma-Ray and Multi-Wave Band Emission from Gamma-Ray-loud Blazars
Authors
KeywordsAstronomy physics
Issue Date2000
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2000, v. 537 n. 1 pt 1, p. 80-90 How to Cite?
AbstractUsing multiwave band data for 61 -rayloud blazars (17 BL Lacertae objects and 44 flat-spectrum radio quasars [FSRQs]), we have studied the possible correlation between flux densities (FR, FK, FO, FX, and F) in the radio, infrared, optical, X-ray, and -ray wave bands, in both the low and high states. For some blazars, it is hard to determine whether they are in a low or a high state because only one data point is available for each of them; initially, we exclude these blazars in our analysis. However, we include these blazars in later analysis by temporarily assuming them to be in a low state or a high state. Our main results are as follows. There are very strong correlations between FX and FO and between FO and FK in both low and high states. However, a strong correlation between FX and FK exists only in the low state. No definite correlation is found between -ray flux density and those of lower energy bands; however, there are hints of anticorrelation between F and FX as well as F and FO and a positive correlation between F and FR. From these results we suggest that (1) photons from infrared to X-rays are emitted by the same particles via synchrotron radiation and (2) if -rays are mainly produced by an inverse Compton scattering mechanism, it seems that the up-scattered soft photons are from external photons rather than synchrotron photons.
Persistent Identifierhttp://hdl.handle.net/10722/43299
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorZhang, Xen_HK
dc.contributor.authorZhang, Len_HK
dc.date.accessioned2007-03-23T04:43:08Z-
dc.date.available2007-03-23T04:43:08Z-
dc.date.issued2000en_HK
dc.identifier.citationThe Astrophysical Journal, 2000, v. 537 n. 1 pt 1, p. 80-90en_HK
dc.identifier.issn0004-637Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/43299-
dc.description.abstractUsing multiwave band data for 61 -rayloud blazars (17 BL Lacertae objects and 44 flat-spectrum radio quasars [FSRQs]), we have studied the possible correlation between flux densities (FR, FK, FO, FX, and F) in the radio, infrared, optical, X-ray, and -ray wave bands, in both the low and high states. For some blazars, it is hard to determine whether they are in a low or a high state because only one data point is available for each of them; initially, we exclude these blazars in our analysis. However, we include these blazars in later analysis by temporarily assuming them to be in a low state or a high state. Our main results are as follows. There are very strong correlations between FX and FO and between FO and FK in both low and high states. However, a strong correlation between FX and FK exists only in the low state. No definite correlation is found between -ray flux density and those of lower energy bands; however, there are hints of anticorrelation between F and FX as well as F and FO and a positive correlation between F and FR. From these results we suggest that (1) photons from infrared to X-rays are emitted by the same particles via synchrotron radiation and (2) if -rays are mainly produced by an inverse Compton scattering mechanism, it seems that the up-scattered soft photons are from external photons rather than synchrotron photons.en_HK
dc.format.extent160549 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/0004-637X/en_HK
dc.relation.ispartofThe Astrophysical Journal-
dc.rightsThe Astrophysical Journal. Copyright © Institute of Physics Publishing, Inc.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAstronomy physicsen_HK
dc.titleGamma-Ray and Multi-Wave Band Emission from Gamma-Ray-loud Blazarsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=537&issue=pt 1&spage=80&epage=90&date=2000&atitle=Gamma-Ray+and+MultiWave+Band+Emission+from+Gamma-Rayloud+Blazarsen_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1086/309003en_HK
dc.identifier.scopuseid_2-s2.0-0034216530-
dc.identifier.hkuros55902-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034216530&selection=ref&src=s&origin=recordpage-
dc.identifier.volume537-
dc.identifier.issue1 pt. 1-
dc.identifier.spage80-
dc.identifier.epage90-
dc.identifier.isiWOS:000088371000010-
dc.publisher.placeUnited Kingdom-
dc.identifier.scopusauthoridCheng, KS=9745798500-
dc.identifier.scopusauthoridCheng, KS=9745798500-
dc.identifier.scopusauthoridZhang, L=38762428100-

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