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arXiv 0704.0209astro-ph
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超新星1987 A的钱德拉观测

Chandra Observations of Supernova 1987A

Sangwook Park, David N. Burrows, Gordon P. Garmire, Richard McCray, Judith L. Racusin, Svetozar A. Zhekov

摘要:

自1999年以来,我们一直在监测超新星(SN)1987 A与{ \it钱德拉X射线天文台}。我们提出了一个审查以前的结果,从我们的{ \it钱德拉}的观测,并从新的{ \it钱德拉}在2006年和2007年获得的数据的一些初步结果。利用{ \it Chandra}对SN 1987 A进行的高分辨率成像和光谱研究表明,SN 1987 A的X射线辐射来源于超新星爆炸前大质量前身星的赤道恒星风产生的环状致密星周介质(CSM)与爆炸波相互作用产生的高温气体。冲击波现在正扫过内环周围密集的CSM,因此SN 1987 A在软X射线中迅速变亮。在20岁时(截至2007年1月),SN 1987 A在0.5 $-$ 10 keV波段的X射线光度为$L_{\rm X}$ $\sim$ 2.4 $\times$ 10 $^{36}$尔格s $^{-1}$。X射线辐射用两分量平面激波模型描述,电子温度分别为$kT$ 0.3和2 keV。由于激波前缘与内环周围的致密CSM相互作用,X射线残骸现在的膨胀速度比2004年之前慢得多($v$ $\sim$ 1400 km s $^{-1}$ 6000 km s $^{-1}$)。

英文摘要:

We have been monitoring Supernova (SN) 1987A with {\it Chandra X-Ray Observatory} since 1999. We present a review of previous results from our {\it Chandra} observations, and some preliminary results from new {\it Chandra} data obtained in 2006 and 2007. High resolution imaging and spectroscopic studies of SN 1987A with {\it Chandra} reveal that X-ray emission of SN 1987A originates from the hot gas heated by interaction of the blast wave with the ring-like dense circumstellar medium (CSM) that was produced by the massive progenitor's equatorial stellar winds before the SN explosion. The blast wave is now sweeping through dense CSM all around the inner ring, and thus SN 1987A is rapidly brightening in soft X-rays. At the age of 20 yr (as of 2007 January), X-ray luminosity of SN 1987A is $L_{\rm X}$ $\sim$ 2.4 $\times$ 10$^{36}$ ergs s$^{-1}$ in the 0.5$-$10 keV band. X-ray emission is described by two-component plane shock model with electron temperatures of $kT$ $\sim$ 0.3 and 2 keV. As the shock front interacts with dense CSM all around the inner ring, the X-ray remnant is now expanding at a much slower rate of $v$ $\sim$ 1400 km s$^{-1}$ than it was until 2004 ($v$ $\sim$ 6000 km s$^{-1}$).

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