主要内容:
分别在不同的时间注入不能的能量，来解释余辉中的增亮。
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文章信息:
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- · arXiv e-print (arXiv:1312.0794)
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| Title: |
| Fall back accretion and energy injections in the ultra-long GRB 111209A |
| Authors: |
| Yu, Y. B.; Wu, X. F.; Huang, Y. F.; Coward, D. M.; Stratta, G.; Gendre, B.; Howell, E. J. |
| Publication: |
| eprint arXiv:1312.0794 |
| Publication Date: |
| 12/2013 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 18 pages, 2 figures, submitted to APJ. v2: replaced, references added, Conclusions unchanged |
| Bibliographic Code: |
| 2013arXiv1312.0794Y |
Abstract
The ultra-long Gamma Ray Burst 111209A, which occurred at a
redshift of
$z = 0.677$, is the longest duration burst ever observed due to a rest
frame prompt emission duration of order of $10^
{4
}$ s. The very early
X-ray afterglow of Gamma Ray Burst 111209A showed unusual behavior, with
a significant bump observed at about 2000 s after the BAT trigger. One
possible explanation is that the bump resulted from mass fall back. In
this paper, we present a detailed numerical study of the fall back
process to interpret the very early X-ray afterglow light curve of Gamma
Ray Burst 111209A. For the afterglow at
late times, we apply external
shock by adding an energy injection. In our model, we assume two periods
of energy injection, each with a constant injection power. One injection
starts at $8.0\times10^{3}$ s and lasts for about 8000 s, with an
injection power of $9.0\times10^{47}$ ${\rm erg
}$ ${\rm s^
{-1}
}$; this
energy injection accounts for the plateau at X-ray wavelength in the
early stage. The other injection starts at $6.5\times10^{4}$ s and lasts
for about 16
ks with an injection power of $6.0\times10^{46}$ ${\rm
erg
}$ ${\rm s^
{-1}
}$. This second energy injection can help to explain
the other plateau at X-ray wavelengths and the
rebrightening in the
optical band at about $10^
{5
}$ s. We argue that the two periods of
energy injection can be produced by the
infall of clumpy mass onto the
central compact object of the burster, which leads to an enhancement of
the accretion rate and results in a strong temporary outflow.
