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arXiv 1107.2121astro-ph.HE
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SGR J0501 +4516爆发的费米/GBM观测

Fermi/GBM Observations of SGR J0501+4516 Bursts

Lin Lin, Chryssa Kouveliotou, Matthew G. Baring, Alexander J. van der Horst, Sylvain Guiriec, Peter M. Woods, Ersin Gogus, Yuki Kaneko, Jeffrey Scargle, Jonatha… 展开作者

Lin Lin, Chryssa Kouveliotou, Matthew G. Baring, Alexander J. van der Horst, Sylvain Guiriec, Peter M. Woods, Ersin Gogus, Yuki Kaneko, Jeffrey Scargle, Jonathan Granot, Robert Preece, Andreas von Kienlin, Vandiver Chaplin, Anna L. Watts, Ralph A. M. J. Wijers, Shuang Nan Zhang, Narayan Bhat, Mark H. Finger, Neil Gehrels, Alice Harding, Lex Kaper, Victoria Kaspi, Julie Mcenery, Charles A. Meegan, William S. Paciesas, Asaf Pe'er, Enrico Ramirez-Ruiz, Michiel van der Klis, Stefanie Wachter, Colleen Wilson-Hodge

摘要:

我们提出了我们的时间和光谱分析的29个爆发SGR J 0501 +4516,检测到的伽马射线暴监视器板载费米伽玛射线太空望远镜在13天的源激活在2008年(8月22日至9月3日)。我们发现,爆发的T90持续时间可以用平均值为~ 123 ms的对数正态分布拟合。我们还估计了光子空间中软伽马重复(SGR)爆发的第一时间事件持续时间(即,使用它们的去卷积光谱),并发现这些与在计数空间中估计的T90非常相似(遵循对数正态分布,平均值为~ 124 ms)。我们用几种模型拟合了每个爆发的时间积分谱和五个最亮爆发的时间分辨谱。我们发现,一个单一的指数截止模型的幂律拟合所有29个爆发,而18个事件也可以与两个黑体函数。我们扩大这两个模型的物理解释,我们比较它们的参数,并讨论它们的演变。我们发现,时间积分和时间分辨光谱显示,Epeak降低能量通量(和注量)的最小值~30 keV的F= 8.7 e-6 erg/cm 2/s,之后稳步增加。另外两个来源也表现出类似的趋势:SGRs J1550-5418和1806-20。对应于这些通量值的各向同性光度对于所有源(0.4-1.5 e40 erg/s)大致相似。

英文摘要:

We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the Gamma-ray Burst Monitor onboard the Fermi Gamma-ray Space Telescope during the 13 days of the source activation in 2008 (August 22 to September 3). We find that the T90 durations of the bursts can be fit with a log-normal distribution with a mean value of ~ 123 ms. We also estimate for the first time event durations of Soft Gamma Repeater (SGR) bursts in photon space (i.e., using their deconvolved spectra) and find that these are very similar to the T90s estimated in count space (following a log-normal distribution with a mean value of ~ 124 ms). We fit the time-integrated spectra for each burst and the time-resolved spectra of the five brightest bursts with several models. We find that a single power law with an exponential cutoff model fits all 29 bursts well, while 18 of the events can also be fit with two black body functions. We expand on the physical interpretation of these two models and we compare their parameters and discuss their evolution. We show that the time-integrated and time-resolved spectra reveal that Epeak decreases with energy flux (and fluence) to a minimum of ~30 keV at F=8.7e-6 erg/cm2/s, increasing steadily afterwards. Two more sources exhibit a similar trend: SGRs J1550-5418 and 1806-20. The isotropic luminosity corresponding to these flux values is roughly similar for all sources (0.4-1.5 e40 erg/s).

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