One of the youngest known remnants of a core-collapse supernova (SN) in our Galaxy is G320.4−1.2/MSH 15-5 2 , containing an energetic pulsar with a very short (1700 yr) spindown age and likely produced by a stripped-envelope SN Ibc. Bright X-ray and radio emission north of the pulsar overlaps with an H α nebula RCW 89. The bright X-rays there have a highly unusual and quite puzzling morphology, consisting of both very compact thermally emitting knots and much more diffuse emission of nonthermal origin. We report new X-ray observations of RCW 89 in 2017 and 2018 with Chandra that allowed us to measure the motions of many knots and filaments on decade-long time baselines. We identify a fast blast wave with a velocity of ##IMG## [http://ej.iop.org/images/2041-8205/895/2/L32/apjlab91c0ieqn1.gif] {$(4000\pm 500){d}_{5.2}$} km s −1 ( ##IMG## [http://ej.iop.org/images/2041-8205/895/2/L32/apjlab91c0ieqn2.gif] {${d}_{5.2}$} ...

中文翻译：

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年轻核心坍缩超新星残留MSH 15-5 2 / RCW 89中的快速爆炸波和抛射

G320.4−1.2 / MSH 15-5 2是我们银河系中最年轻的已知的核塌陷超新星遗迹之一，其中含有一个能量极高的脉冲星，其旋转寿命很短（1700年），很可能是由剥离信封SN Ibc。脉冲星以北的明亮的X射线和无线电发射与Hα星云RCW 89重叠。那里的明亮的X射线具有非常不寻常且令人费解的形态，包括非常紧凑的热结和非扩散的更多散射。起源。我们用钱德拉报告了2017年和2018年RCW 89的新X射线观察结果，这使我们能够在长达十年的基线上测量许多结和细丝的运动。我们以## IMG ## [http://ej.iop.org/images/2041-8205/895/2/L32/apjlab91c0ieqn1.gif] {$（4000 \ pm 500） {d} _ {5.2} $} km s -1（## IMG ## [http：// ej。