γ暴研究的重大突破:余辉的发现与观测研究

New Breakthrough in Υ-ray Burst Research: Afterglows Being Observed

由于BeppoSAX卫星的独特贡献，最近观测到了若于Υ暴在X射线、光学甚至射电波段上的对应体，一度陷入困境的Υ暴研究再次取得了突破性的进展。目前已经观测到了Υ暴GRB970228持续六个月以上的光学余辉，发现它可能位于一个暗弱的宿主星系中；GRB970508的光学余辉有较为复杂的表现，并测出其红移范围0．85＜z＜2．1。在该暴发生约五、六天之后，还观测到了射电耀发现象。观测上的重大突破比较有力地支持了Υ暴的宇宙学起源及火球模型。

Thanks to the prominent operations of BeppoSAX satellite, X-ray, optical and even radio afterglows from several γ-ray bursts were observed recently, leading to a great breakthrough in the field. GRB 970228 seems to be associated with a faint host galaxy, and its optical afterglow kept detectable for more than six months; GRB 970508 shows complex behaviour in optical bands, its red shift has been determined to be 0.835 ≤ z ≤ 2.1, and a radio flare was observed about five days after the burst. These observations strongly suggest a cosmological origin for Υ-ray bursts and the so called fireball model is favored currently.