Testing the external-shock model of gamma-ray bursts using the late-time simultaneous optical and X-ray afterglows

Yuji Urata*, Ryo Yamazaki, Takanori Sakamoto, Kuiyun Huang, Weikang Zheng, Goro Sato, Tsutomu Aoki, Jinsong Deng, Kunihito Ioka, WingHuen Ip, Koji S. Kawabata, Yihsi Lee, Xin Liping, Hiroyuki Mito, Takashi Miyata, Yoshikazu Nakada, Takashi Ohsugi, Yulei Qiu, Takao Soyano, Kenichi TarusawaMakoto Tashiro, Makoto Uemura, Jianyan Wei, Takuya Yamashita

*この研究の対応する著者

研究成果査読

21 被引用数 (Scopus)

抄録

We study the "normal" decay phase of the X-ray afterglows of gamma-ray bursts (GRBs), which follows the shallow decay phase, using the events simultaneously observed in the R band. The classical external-shock model - in which neither the delayed energy injection nor time dependency of shock microphysics is consideredshows that the decay indices of the X-ray and R-band light curves, αx and αo, obey a certain relation, and that in particular, αo - αx should be larger than -1/4 unless the ambient density increases with the distance from the central engine. For our selected 14 samples, we have found that four events violate the limit at more than the 3 σ level, so that a fraction of events are outliers of the classical external-shock model at the "normal" decay phase.

本文言語English
ジャーナルAstrophysical Journal
668
2 PART 2
DOI
出版ステータスPublished - 2007

ASJC Scopus subject areas

  • 宇宙惑星科学
  • 天文学と天体物理学

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