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Article: The spectral flattening of the low-energy component in gamma-ray bursts
Title | The spectral flattening of the low-energy component in gamma-ray bursts |
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Authors | |
Keywords | Gamma-rays: bursts Radiation mechanisms: nonthermal |
Issue Date | 1996 |
Publisher | Blackwell 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? |
Abstract | Observations 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 Identifier | http://hdl.handle.net/10722/80537 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Cheng, KS | en_HK |
dc.contributor.author | Wei, DM | en_HK |
dc.date.accessioned | 2010-09-06T08:07:32Z | - |
dc.date.available | 2010-09-06T08:07:32Z | - |
dc.date.issued | 1996 | en_HK |
dc.identifier.citation | Monthly Notices Of The Royal Astronomical Society, 1996, v. 283 n. 4, p. L133-L137 | en_HK |
dc.identifier.issn | 0035-8711 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/80537 | - |
dc.description.abstract | Observations 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.language | eng | en_HK |
dc.publisher | Blackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/MNR | en_HK |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | en_HK |
dc.rights | Monthly Notices Letters of the Royal Astronomical Society. Copyright © Blackwell Publishing Ltd. | en_HK |
dc.subject | Gamma-rays: bursts | en_HK |
dc.subject | Radiation mechanisms: nonthermal | en_HK |
dc.title | The spectral flattening of the low-energy component in gamma-ray bursts | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://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+Bursts | en_HK |
dc.identifier.email | Cheng, KS: hrspksc@hkucc.hku.hk | en_HK |
dc.identifier.authority | Cheng, KS=rp00675 | en_HK |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1093/mnras/283.4.L133 | - |
dc.identifier.scopus | eid_2-s2.0-1542604190 | en_HK |
dc.identifier.hkuros | 21212 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-1542604190&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 283 | en_HK |
dc.identifier.issue | 4 | en_HK |
dc.identifier.spage | L133 | en_HK |
dc.identifier.epage | L137 | en_HK |
dc.identifier.isi | WOS:A1996WA23500007 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Cheng, KS=9745798500 | en_HK |
dc.identifier.scopusauthorid | Wei, DM=7202908906 | en_HK |
dc.identifier.issnl | 0035-8711 | - |