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首页> 外文期刊>The Astrophysical journal >Chandra Observations of the X-Ray Environs of SN?1998bw/GRB?980425
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Chandra Observations of the X-Ray Environs of SN?1998bw/GRB?980425

机译:SN?1998bw / GRB?980425的X射线环境的Chandra观测

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We report X-ray studies of the environs of SN 1998bw and GRB 980425 using the Chandra X-Ray Observatory 1281 days after the gamma-ray burst (GRB). Eight X-ray point sources were localized, three and five each in the original error boxes, S1 and S2, assigned for variable X-ray counterparts to the GRB by BeppoSAX. The sum of the discrete X-ray sources plus continuous emission in S2 observed by Chandra on day 1281 is within a factor of 1.5 of the maximum and the upper limits seen by BeppoSAX. We conclude that S2 is the sum of several variable sources that have not disappeared and therefore is not associated with the GRB. Within S1, clear evidence is seen for a decline of approximately a factor of 12 between day 200 and day 1281. One of the sources in S1, S1a, is coincident with the well-determined radio location of SN 1998bw and is certainly the remnant of that explosion. The nature of the other sources is also discussed. Combining our observation of the supernova with others of the GRB afterglow, a smooth X-ray light curve, spanning ~1400 days, is obtained by assuming that the burst and supernova were coincident at 35.6 Mpc. When this X-ray light curve is compared with those of the X-ray "afterglows" of ordinary GRBs, X-ray flashes, and ordinary supernovae, evidence emerges for at least two classes of light curves, perhaps bounding a continuum. By 3-10 yr, all these phenomena seem to converge on a common X-ray luminosity, possibly indicative of the supernova underlying them all. This convergence strengthens the conclusion that SN 1998bw and GRB 980425 took place in the same object. One possible explanation for the two classes is that a (nearly) standard GRB was observed at different angles, in which case X-ray afterglows with intermediate luminosities should eventually be discovered. Finally, we comment on the contribution of GRB afterglows to the ultraluminous X-ray source population.
机译:我们在γ射线爆发(GRB)后1281天使用Chandra X射线天文台报告了SN 1998bw和GRB 980425周围环境的X射线研究。定位了八个X射线点源,分别在原始错误框S1和S2中分别为三个和五个,由BeppoSAX分配给GRB的可变X射线副本。 Chandra在第1281天观察到的离散X射线源加上S2中的连续发射的总和,是BeppoSAX看到的最大值和上限的1.5倍。我们得出的结论是,S2是尚未消失的几个变量源的总和,因此与GRB不相关。在S1内,可以看到清晰的证据表明在200天到1281天之间大约下降了12倍。S1a的一个信号源S1a与SN 1998bw的确定无线电位置一致,并且肯定是S1b的残余。那爆炸。还讨论了其他来源的性质。结合我们对超新星的观测和其他GRB余辉,通过假设爆发和超新星在35.6 Mpc处重合,获得了跨越1400天的平滑X射线光曲线。当将此X射线光曲线与普通GRB,X射线闪光和普通超新星的X射线“余辉”相比较时,至少有两类光曲线出现了证据,可能会限制一个连续体。到3-10年,所有这些现象似乎都集中在一个共同的X射线光度上,这可能表明它们背后都存在超新星。这种融合强化了SN 1998bw和GRB 980425发生在同一对象中的结论。对于这两种类型的一种可能解释是,在不同角度观察到了(近乎)标准GRB,在这种情况下,最终应发现具有中等发光度的X射线余辉。最后,我们评论了GRB余辉对超发光X射线源群体的贡献。

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