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Are some breaks in GRB afterglows caused by their spectra?
Wei, DM; Lu, T
AbstractSharp breaks have been observed in the afterglow light curves of several GRBs; this is generally explained by the jet model. However, there are still some uncertainties concerning this interpretation due to the unclear hydrodynamics of jet sideways expansion. Here we propose an alternative explanation to these observed breaks. If we assume that the multiwavelength spectra of GRB afterglows are not made of exact power law segments but their slope changes smoothly, i.e. dbeta/dlognu < 0, where Beta is the spectral index, we find that this fact can very nicely explain the afterglow light curves showing breaks. Therefore we suggest that some breaks in the afterglow light curves may be caused by their curved spectra. The main feature of this interpretation is that the break time is dependent on the observed frequency, while the jet model produces achromatic breaks in the light curves. In addition, it is very important to know the position of the characteristic frequency ν(c) in the multiwavelength spectrum at the time of the break, since it is a further discriminant between our model and the jet model. We find that although the optical light curves of seven GRB afterglows can be well fitted by the model we propose, in fact only one of them (i.e. GRB 000926) can be explained in this framework, since for the others the characteristic frequency nu(c) is either above the optical after the break or below the optical before the break.
KeywordGamma Rays : Bursts
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000173343100032
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100864, Peoples R China
3.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
4.Chinese Acad Sci, Inst High Energy Phys, Lab Cosmic Ray & High Energy Astrophys, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Wei, DM,Lu, T. Are some breaks in GRB afterglows caused by their spectra?[J]. ASTRONOMY & ASTROPHYSICS,2002,381(2):731-735.
APA Wei, DM,&Lu, T.(2002).Are some breaks in GRB afterglows caused by their spectra?.ASTRONOMY & ASTROPHYSICS,381(2),731-735.
MLA Wei, DM,et al."Are some breaks in GRB afterglows caused by their spectra?".ASTRONOMY & ASTROPHYSICS 381.2(2002):731-735.
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