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arXiv 1107.4844astro-ph.HE
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GRB 090926 B与MAXI和Fermi/GBM的特殊窄SED

Peculiarly Narrow SED of GRB 090926B with MAXI and Fermi/GBM

Motoko Serino, Atsumasa Yoshida, Nobuyuki Kawai, Yujin E. Nakagawa, Yoshihiro Ueda, Tatehiro Mihara, Satoshi Nakahira, Satoshi Eguchi, Kazuo Hiroi, Masaki Ishik… 展开作者

Motoko Serino, Atsumasa Yoshida, Nobuyuki Kawai, Yujin E. Nakagawa, Yoshihiro Ueda, Tatehiro Mihara, Satoshi Nakahira, Satoshi Eguchi, Kazuo Hiroi, Masaki Ishikawa, Naoki Isobe, Masashi Kimura, Hiroki Kitayama, Mitsuhiro Kohama, Takanori Matsumura, Masaru Matsuoka, Mikio Morii, Motoki Nakajima, Hitoshi Negoro, Megumi Shidatsu, Tetsuya Sootome, Kousuke Sugimori, Mutsumi Sugizaki, Fumitoshi Suwa, Takahiro Toizumi, Hiroshi Tomida, Yohko Tsuboi, Hiroshi Tsunemi, Shiro Ueno, Ryuichi Usui, Takayuki Yamamoto, Kazutaka Yamaoka, Makoto Yamauchi, Kyohei Yamazaki, the MAXI Collaboration

摘要:

2009年9月26日,国际空间站(ISS)上的全天空X射线图像(MAXI)气体狭缝相机(GSC)监测到一次伽马射线暴(GRB\,090926 B)。这种伽玛射线暴在X射线能量范围内具有非常硬的光谱。与费米伽玛射线空间望远镜上的伽马射线暴监测器的联合谱拟合表明,该暴具有特殊的窄谱能量分布,可用康普顿化黑体模型表示。这一光谱可以解释为来自低重子负荷伽玛暴火球的光球辐射。通过对火球参数的计算,我们得到了流底的大小$r_0 = (4.3 \pm 0.9) \times 10^{9} \, Y^{\prime \, -3/2}$ cm和等离子体的洛伦兹因子$Γ= (110 \pm 10) \, Y^{\prime \, 1/4}$,其中$Y^{\prime}$是火球总能量与γ射线发射黑体分量能量的比值。这个$r_0$比光谱中有黑体分量的其他爆发大几倍,而110的洛伦兹因子也比光谱中有黑体分量的其他爆发小几倍。

英文摘要:

The monitor of all-sky X-ray image (MAXI) Gas Slit Camera (GSC) on the International Space Station (ISS) detected a gamma-ray burst (GRB) on 2009, September 26, GRB\,090926B. This GRB had extremely hard spectra in the X-ray energy range. Joint spectral fitting with the Gamma-ray Burst Monitor on the Fermi Gamma-ray Space Telescope shows that this burst has peculiarly narrow spectral energy distribution and is represented by Comptonized blackbody model. This spectrum can be interpreted as photospheric emission from the low baryon-load GRB fireball. Calculating the parameter of fireball, we found the size of the base of the flow $r_0 = (4.3 \pm 0.9) \times 10^{9} \, Y^{\prime \, -3/2}$ cm and Lorentz factor of the plasma $Γ= (110 \pm 10) \, Y^{\prime \, 1/4}$, where $Y^{\prime}$ is a ratio between the total fireball energy and the energy in the blackbody component of the gamma-ray emission. This $r_0$ is factor of a few larger, and the Lorentz factor of 110 is smaller by also factor of a few than other bursts that have blackbody components in the spectra.

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