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Article: The spectral flattening of the low-energy component in gamma-ray bursts

TitleThe spectral flattening of the low-energy component in gamma-ray bursts
Authors
KeywordsGamma-rays: bursts
Radiation mechanisms: nonthermal
Issue Date1996
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR
Citation
Monthly Notices Of The Royal Astronomical Society, 1996, v. 283 n. 4, p. L133-L137 How to Cite?
AbstractObservations from BATSE show that the spectra of gamma-ray bursts are very wide, which cannot be described by a simple law. The distribution of the peak energy Ep [defined as the maximum of the Eγ 2N(Eγ) spectrum], and of the spectral indices below and above Ep, is wide. In particular, the slope below Ep lies mainly between 0.5 and 1, which is inconsistent with the 4/3 predicted by the simple synchrotron radiation spectrum. Here we discuss the emission model for gamma-ray bursts based on the shock model proposed by Mészáros & Rees. We find that the synchrotron radiation of relativistic electrons accelerated by a strong shock, together with the finite lifetime of synchrotron radiation and the non-uniform magnetic field distribution, can explain the gamma-ray burst spectra, and the spectral index below the peak energy Ep can be flattened by the non-uniform magnetic field distribution; this flattening is insensitive to the specific form of the magnetic field variance. Furthermore, the peak energy Ep∝Γ4 is sensitively dependent on the bulk Lorentz factor.
Persistent Identifierhttp://hdl.handle.net/10722/80537
ISSN
2015 Impact Factor: 4.952
2015 SCImago Journal Rankings: 2.806
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorWei, DMen_HK
dc.date.accessioned2010-09-06T08:07:32Z-
dc.date.available2010-09-06T08:07:32Z-
dc.date.issued1996en_HK
dc.identifier.citationMonthly Notices Of The Royal Astronomical Society, 1996, v. 283 n. 4, p. L133-L137en_HK
dc.identifier.issn0035-8711en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80537-
dc.description.abstractObservations from BATSE show that the spectra of gamma-ray bursts are very wide, which cannot be described by a simple law. The distribution of the peak energy Ep [defined as the maximum of the Eγ 2N(Eγ) spectrum], and of the spectral indices below and above Ep, is wide. In particular, the slope below Ep lies mainly between 0.5 and 1, which is inconsistent with the 4/3 predicted by the simple synchrotron radiation spectrum. Here we discuss the emission model for gamma-ray bursts based on the shock model proposed by Mészáros & Rees. We find that the synchrotron radiation of relativistic electrons accelerated by a strong shock, together with the finite lifetime of synchrotron radiation and the non-uniform magnetic field distribution, can explain the gamma-ray burst spectra, and the spectral index below the peak energy Ep can be flattened by the non-uniform magnetic field distribution; this flattening is insensitive to the specific form of the magnetic field variance. Furthermore, the peak energy Ep∝Γ4 is sensitively dependent on the bulk Lorentz factor.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNRen_HK
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen_HK
dc.rightsMonthly Notices Letters of the Royal Astronomical Society. Copyright © Blackwell Publishing Ltd.en_HK
dc.subjectGamma-rays: burstsen_HK
dc.subjectRadiation mechanisms: nonthermalen_HK
dc.titleThe spectral flattening of the low-energy component in gamma-ray burstsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1745-3925&volume=283&spage=L133&epage=L137&date=1996&atitle=The+Spectral+Flattening+of+the+Low-energy+Component+in+Gamma-ray+Burstsen_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-s2.0-1542604190en_HK
dc.identifier.hkuros21212en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-1542604190&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume283en_HK
dc.identifier.issue4en_HK
dc.identifier.spageL133en_HK
dc.identifier.epageL137en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridWei, DM=7202908906en_HK

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