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arXiv 1104.4825astro-ph.HE
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超新星遗迹1987 A的一个新演化相

A New Evolutionary Phase of Supernova Remnant 1987A

Sangwook Park, Svetozar A. Zhekov, David N. Burrows, Judith L. Racusin, Daniel Dewey, Richard McCray

摘要:

自1999年以来,我们一直在用{ \it Chandra}观测超新星遗迹(SNR)1987 A。本文报道了SNR 1987 A的软X射线光变曲线的最新变化。对于最近的$\sim$ 1.5年(自$\sim$ 8000日起),软X射线通量已显著变平,在0.5--2 keV波段停留在(在不确定性范围内)$f_{\rm X}$ $\sim$ 5.7 $\times$ 10 $^{-12}$ erg cm $^{-2}$ s $^{-1}$(对应于$L_{\rm X}$ $\sim$ 3.6 $\times$ 10 $^{36}$ erg s $^{-1}$)。最近软X射线光变曲线的这种显著变化表明,在$\sim$ 8000天之前的10年里,前向激波与$\sim$上的密度梯度增加的结构相互作用后,现在正与密度减小的结构相互作用。可能包括激波现在传播超过内环的密度峰值的情况。我们简要地讨论了一些可能的影响的性质的祖和未来的前景,我们的{ \it钱德拉}监测观测。

英文摘要:

We have been monitoring the supernova remnant (SNR) 1987A with {\it Chandra} observations since 1999. Here we report on the latest change in the soft X-ray light curve of SNR 1987A. For the last $\sim$1.5 yr (since day $\sim$8000), the soft X-ray flux has significantly flattened, staying (within uncertainties) at $f_{\rm X}$ $\sim$ 5.7 $\times$ 10$^{-12}$ erg cm$^{-2}$ s$^{-1}$ (corresponding to $L_{\rm X}$ $\sim$ 3.6 $\times$ 10$^{36}$ erg s$^{-1}$) in the 0.5--2 keV band. This remarkable change in the recent soft X-ray light curve suggests that the forward shock is now interacting with a decreasing density structure, after interacting with an increasing density gradient over $\sim$10 yr prior to day $\sim$8000. Possibilities may include the case that the shock is now propagating beyond a density peak of the inner ring. We briefly discuss some possible implications on the nature of the progenitor and the future prospects of our {\it Chandra} monitoring observations.

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