arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1602.03531astro-ph.HE
收藏

G11.2 - 0.3:一颗剥层超新星的年轻残骸

G11.2-0.3: The Young Remnant of a Stripped-Envelope Supernova

Kazimierz J. Borkowski, Stephen P. Reynolds, Mallory S. E. Roberts

摘要:

我们目前的结果,400-ks钱德拉观测的年轻壳超新星遗迹(SNR)G11.2 - 0.3,包含脉冲星和脉冲星风星云(PWN)。我们测量了自2000年以来壳层的平均膨胀率为每年0.0277 +/-0.0018%,这意味着年龄在1400到2400年之间,使G11.2 - 0.3成为银河系中最年轻的核心塌陷SNR之一。然而,我们发现非常高的吸收($A_V \sim 16^m \pm 2^m$),证实了近红外测定,并排除了与386 CE可能的历史SN的相关性。PWN显示出强烈的喷流和一个微弱的环面,在一个更大、更弥散的射电辐射和非热X射线区域内。中心的软热X射线发射与PWN相关,以及更详细的形态学证据表明,反向冲击已经重新加热了所有喷出物并压缩了PWN。脉冲星特征能量损失时间尺度远远超过了剩余年龄,我们认为明亮的喷流是在再压缩后产生的。相对明显的壳层和内部弥漫的硬X射线发射,在壳层的内缘增强,表明G11.2 - 0.3膨胀进入的直接星周介质是相当各向异性的。我们提出G11.2 - 0.3可能起源于一个剥离的包层祖先,在各向异性风或由于双星相互作用,几乎失去了所有的包层质量,留下了一个紧凑的核心,其快速风将先前失去的质量扫入致密的不规则壳层,并爆炸为cIIb或Ibc型超新星。

英文摘要:

We present results of a 400-ks Chandra observation of the young shell supernova remnant (SNR) G11.2-0.3, containing a pulsar and pulsar-wind nebula (PWN). We measure a mean expansion rate for the shell since 2000 of 0.0277+/-0.0018% per yr, implying an age between 1400 and 2400 yr, and making G11.2-0.3 one of the youngest core-collapse SNRs in the Galaxy. However, we find very high absorption ($A_V \sim 16^m \pm 2^m$), confirming near-IR determinations and ruling out a claimed association with the possible historical SN of 386 CE. The PWN shows strong jets and a faint torus within a larger, more diffuse region of radio emission and nonthermal X-rays. Central soft thermal X-ray emission is anticorrelated with the PWN; that, and more detailed morphological evidence, indicates that the reverse shock has already reheated all ejecta and compressed the PWN. The pulsar characteristic energy-loss timescale is well in excess of the remnant age, and we suggest that the bright jets have been produced since the recompression. The relatively pronounced shell and diffuse hard X-ray emission in the interior, enhanced at the inner edge of the shell, indicate that the immediate circumstellar medium into which G11.2-0.3 is expanding was quite anisotropic. We propose a possible origin for G11.2-0.3 in a stripped-envelope progenitor that had lost almost all its envelope mass, in an anisotropic wind or due to binary interaction, leaving a compact core whose fast winds swept previously lost mass into a dense irregular shell, and which exploded as a Type cIIb or Ibc supernova.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑