Qin Yiping; Zhang Fuwen
Source Publicationchinesejournalofastronomyandastrophysics
AbstractAppearing in the composite spectral data of BATSE, EGRET and COMPTEL for GRB 910503, there is a bump at around 1600 keV. We perform a statistical analysis on the spectral data, trying to find out if the bump could be accounted for by a blue-shifted and significantly broadened rest frame line due to the Doppler effect of an expanding fireball surface. We made an F-test and adopted previously proposed criteria. The study reveals that the criteria are well satisfied and the feature can be interpreted as the blue shifted 6.4 keV line. From the fit with this line taken into account, we find the Lorentz factor of this source to be Gamma =- 116(-9)(+9) (at the 68% confident level, Delta chi(2) = 1) and the rest frame spectral peak energy to be E-0,E-p = 2.96(-0.18)(+0.24) keV. Although the existence of the emission line feature requires other independent tests to confirm, the analysis suggests that it is feasible to detect emission line features in the high energy range of GRB spectra when taking into account the Doppler effect of fireball expansion.
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qin Yiping,Zhang Fuwen. canthebumpinthecompositespectrumofgrb910503beanemissionlinefeatureofgammaraybursts[J]. chinesejournalofastronomyandastrophysics,2005,5(6):627.
APA Qin Yiping,&Zhang Fuwen.(2005).canthebumpinthecompositespectrumofgrb910503beanemissionlinefeatureofgammaraybursts.chinesejournalofastronomyandastrophysics,5(6),627.
MLA Qin Yiping,et al."canthebumpinthecompositespectrumofgrb910503beanemissionlinefeatureofgammaraybursts".chinesejournalofastronomyandastrophysics 5.6(2005):627.
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