arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0706.0880astro-ph
收藏

关于伽马射线暴的X射线辐射

On the X-Ray emission of Gamma Ray Bursts

Shlomo Dado, Arnon Dar, Alvaro De Rujula

摘要:

SWIFT卫星最近收集和触发的数据大大提高了我们对长时间伽马射线暴和X射线闪光的认识。对于X射线数据而言,情况尤其如此。我们表明,整个X射线观测结果与GRB和XRF的“炮弹”模型的预测非常一致,该模型基于简单的物理学,早在SWIFT发射之前就已发表。这些预测有两种机制:逆康普顿散射和同步辐射,通常分别在早期和晚期占主导地位。前一种机制提供了对伽马射线峰值、X射线耀斑、甚至在某些有利情况下看到的光学“驼峰”的统一描述;即它们非常不同的持续时间、通量和峰值时间与预测的精确相关。所观察到的X射线光变曲线的平滑或不平坦的快速衰减被正确地描述为个案,在微小的细节。正如所预言的那样,“正则”X射线平台,以及随后余辉逐渐变陡到渐近幂律衰减。光变曲线的彩色和消色差特性也是如此。

英文摘要:

Recent data gathered and triggered by the SWIFT satellite have greatly improved our knowledge of long-duration gamma ray bursts (GRBs) and X-ray flashes (XRFs). This is particularly the case for the X-ray data at all times. We show that the entire X-ray observations are in excellent agreement with the predictions of the `cannonball' model of GRBs and XRFs, which are based on simple physics and were published long before the launch of SWIFT. Two mechanisms underlie these predictions: inverse Compton scattering and synchrotron radiation, generally dominant at early and late times, respectively. The former mechanism provides a unified description of the gamma-ray peaks, X-ray flares and even the optical `humps' seen in some favourable cases; i.e. their very different durations, fluxes and peak-times are related precisely as predicted. The observed smooth or bumpy fast decay of the X-ray light curve is correctly described case-by-case, in minute detail. The `canonical' X-ray plateau, as well as the subsequent gradual steepening of the afterglow to an asymptotic power-law decay, are as foretold. So are the chromatic and achromatic properties of the light-curves.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑