一个与X射线闪光XRF 06021818相关的光学超新星
E Pian1, P A Mazzali, N Masetti
1Istituto Nazionale di Astrofisica, Trieste Astronomical Observatory, via G. B. Tiepolo 11, I-34131 Trieste, Italy. pian@oats.inaf.it
Nature
|September 1, 2006
概括
这项研究将X射线闪光 (XRF) 与较少发光的超新星联系起来,扩大了已知的马射线爆发 (GRB) 与超新星之间的联系. 这表明本质上较弱的XRF事件比以前认为的更常见.
科学领域:
- * 天体物理学 * 天体物理学
- *高能天体物理学 *高能天体物理学
- * 观测宇宙学是一种观测性宇宙学.
背景情况:
- * 长时间的马射线爆发 (GRBs) 通常与发光的Ic型超新星有关,这些超新星以高速度喷射物质.
- * 较弱光度的超新星以前没有与GRB相关,这表明GRB超新星是罕见的.
- *X射线闪光 (XRF) 与超新星的关联及其性质 (本质上是弱的与离轴GRB相比) 仍然不清楚.
研究的目的:
- * 调查X射线闪光和超新星之间的关联.
- * 为了确定XRF是否本质上是弱事件,还是视离轴的经典GRB.
- *将GRB-超新星连接扩展到较弱的事件.
主要方法:
- * 光学发现和对超新星SN 2006aj的后续观测.
- *光谱分析以确定弹射速度.
- * 整合光学数据与XRF 060218.8的现有无线电和X射线观测.
主要成果:
- *与XRF 060218相关的超新星SN 2006aj比典型的GRB超新星亮度低,但比没有GRB的超新星亮度高.
- *SN 2006aj的射出速度是中等的,与较弱的GRB输出和无线电流相一致.
- *数据表明XRF 060218本质上是一个弱和软事件,而不是一个离轴的GRB.
结论:
- * GRB-超新星连接被扩展到包括X射线闪光和较弱亮度的超新星.
- *XRF 060218代表了一个本质上很弱的事件,挑战了以前的假设.
- *像XRF 060218这样的事件可能比经典的GRB超新星更常见,这意味着它们有共同的起源.
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