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Emission and absorption lines of gamma-ray bursts affected by the relativistic motion of fireball ejecta | | Yi-Ping Qin
; | | Date: |
11 Dec 2003 | | Journal: | Astron.Astrophys. 407 (2003) 393-402 | | Subject: | astro-ph gr-qc hep-ex | | Abstract: | We display by numerical calculation how rest frame spectral lines appear in the observed spectrum of gamma-ray bursts due to the Doppler effect in the fireball framework. The analysis shows that: a) in the spectrum of a relativistically expanding fireball, all rest frame lines would shift to higher energy bands and would be significantly smoothed; b) rest frame weak narrow emission lines as well as narrow absorption lines and absorption line forests would be smoothed and would hardly be detectable; c) the features of rest frame broad emission lines as well as both strong and weak broad absorption lines would remain almost unchanged and therefore would be easier to detect; d) deep gaps caused by rest frame broad absorption lines would be significantly filled; e) a rest frame emission line forest would form a single broad line feature; f) the observed relative width of the rest frame very narrow line would approach $ 0.162$; g) when the Lorentz factor $Gamma $ is large enough, the observed line frequency $
u_{line}$ and the rest frame line frequency $
u_{0,line} $ would be related by $
u_{line}approx 2Gamma
u_{0,line}$. We also investigate the effect of time dependence of the line intensity and the effect of variation of $Gamma $. We find that the feature of rest frame dimming narrow emission lines would disappear when $Gamma $ is very large. The form of emission lines would be sharp on both edges when $Gamma $ varies with time. This phenomenon depends not only on the initial Lorentz factor but also on the observation time. | | Source: | arXiv, astro-ph/0401179 | | Services: | Forum | Review | PDF | Favorites | |
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