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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Spectral properties of gamma-ray bursts observed by the Suzaku wide-band all-sky monitor
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Spectral properties of gamma-ray bursts observed by the Suzaku wide-band all-sky monitor

机译：苏崎宽带全天监测器观察伽马射线突发的光谱特性

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摘要

We have systematically studied the spectral properties of 302 localized gamma-ray bursts (GRBs) observed by the Suzaku wide-band all-sky monitor (WAM) from 2005 August to 2010 December. The energy spectra in the 100-5000keV range integrated over the entire emission and the 1s peak were fitted by three models: a single power law, a power law with an exponential cutoff (CPL), and the GRB Band function (GRB). Most of the burst spectra were well fitted by a single power law. The average photon index alpha was -2.11 and -1.73 for long and short bursts, respectively. For the CPL and GRB models, the low-energy and high-energy photon indices (alpha and beta) for the entire emission spectra were consistent with previous measurements. The averages of the alpha and beta were -0.90 and -2.65 for long-duration GRBs, while the average alpha was -0.55 and the beta was not well constrained for short-duration GRBs. However, the average peak energy E-peak was 645 and 1286keV for long- and short-duration GRBs respectively, which are higher than previous Fermi/GBM measurements (285keV and 736keV). The alpha and E-peak of the 1s peak spectra were larger, i.e., the spectra were harder, than the total fluence spectra. Spectral simulations based on Fermi-GBM results suggest that the higher E(peak)s measured by the Suzaku WAM could be due to detector selection bias, mainly caused by the limited energy range above 100keV.
机译：我们系统地研究了由2005年8月至2010年12月观察到的苏崎宽带全天监测器（WAM）观察到的302局部伽马射线爆发（GRB）的光谱特性。 100-5000KeV范围内的能谱集成在整个发射和1S峰值上，由三种模型安装：单个电力法，具有指数截止（CPL）和GRB带功能（GRB）的电力法。大部分突发光谱都被单一的电力法齐全。平均光子指数α分别为-2.11和-1.73，分别为长短爆发。对于CPL和GRB模型，整个发射光谱的低能量和高能量光子指数（α和β）与先前的测量一致。对于长持续时间GRB，α和β的平均值为-0.90和-2.65，而平均α为-0.55，并且β对短持续时间GRB没有很好地限制。然而，平均峰值能量峰值为645和1286KeV，分别高于和短持续时间GRBS，其高于先前的Fermi / GBM测量（285KeV和736KeV）。 1S峰光谱的α和e-峰值较大，即，光谱比总均衡光谱更难。基于FERMI-GBM结果的光谱仿真表明，Suzaku WAM测量的较高的E（峰值）S可能是由于探测器选择偏压，主要由100keV高于100ke的能量范围引起。

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    Ohmori Norisuke; Yamaoka Kazutaka; Yamauchi Makoto; Urata Yuji; Ohno Masanori; Sugita Satoshi; Hurley Kevin; Tashiro Makoto S.; Fukazawa Yasushi; Iwakiri Wataru; Katsukura Daisuke; Kokubun Motohide; Makishima Kazuo; Murakami Souta; Nakagawa Yujin E.; Nakazawa Kazuhiro; Odaka Katsuya; Takahashi Kaito; Takahashi Tadayuki; Terada Yukikatsu;

  • 作者单位

    Univ Miyazaki Dept Appl Phys 1-1 Gakuen Kibanadai Nishi Miyazaki Miyazaki 8892192 Japan;

    Nagoya Univ Inst Space Earth Environm Res ISEE Chikusa Ku Furo Cho Nagoya Aichi 4648601 Japan;

    Univ Miyazaki Dept Appl Phys 1-1 Gakuen Kibanadai Nishi Miyazaki Miyazaki 8892192 Japan;

    Natl Cent Univ Inst Astron Chungli 32054 Taiwan;

    Hiroshima Univ Dept Phys 1-3-1 Kagamiyama Hiroshima 7398526 Japan;

    Aoyama Gakuin Univ Dept Math &

    Phys Chuo Ku 5-10-1 Fuchinobe Sagamihara Kanagawa 2525258 Japan;

    Univ Calif Berkeley Space Sci Lab 7 Gauss Way Berkeley CA 94720 USA;

    Saitama Univ Dept Phys Sakura Ku 255 Shimo Okubo Saitama Saitama 3388570 Japan;

    Hiroshima Univ Dept Phys 1-3-1 Kagamiyama Hiroshima 7398526 Japan;

    Chuo Univ Dept Phys Bunkyo Ku 1-13-27 Kasuga Tokyo 1128551 Japan;

    Saitama Univ Dept Phys Sakura Ku 255 Shimo Okubo Saitama Saitama 3388570 Japan;

    Japan Aerosp Explorat Agcy JAXA ISAS Dept High Energy Astrophys Chuo Ku 3-1-1 Yoshinodai Sagamihara Kanagawa 2525210 Japan;

    RIKEN Inst Phys &

    Chem Res 2-1 Hirosawa Wako Saitama 3510198 Japan;

    Saitama Univ Dept Phys Sakura Ku 255 Shimo Okubo Saitama Saitama 3388570 Japan;

    Japan Agcy Marine Earth Sci &

    Technol Ctr Earth Informat Sci &

    Technol Kanazawa Ku 3173-25 Showa Machi Yokohawa Kanagawa 2360001 Japan;

    Nagoya Univ KMI Chikusa Ku Furo Cho Nagoya Aichi 4648602 Japan;

    Saitama Univ Dept Phys Sakura Ku 255 Shimo Okubo Saitama Saitama 3388570 Japan;

    Saitama Univ Dept Phys Sakura Ku 255 Shimo Okubo Saitama Saitama 3388570 Japan;

    Univ Tokyo Inst Adv Study Kavli Inst Phys &

    Math Universe WPI 5-1-5 Kashiwa No Ha Kashiwa Chiba 2778583 Japan;

    Saitama Univ Dept Phys Sakura Ku 255 Shimo Okubo Saitama Saitama 3388570 Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

    gamma-ray bursts: general; methods: statistical; radiation mechanisms: non-thermal;

    机译：伽马射线爆发：一般;方法：统计;辐射机制：非热;

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