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 2005.04626astro-ph.HE
收藏

超新星遗迹N49 X射线光栅谱中共振散射的证据

Evidence for Resonance Scattering in the X-ray Grating Spectrum of the Supernova Remnant N49

Yuki Amano, Hiroyuki Uchida, Takaaki Tanaka, Liyi Gu, Takeshi Go Tsuru

摘要:

共振散射(RS)是天体中的一个重要过程,因为它影响元素丰度的测量并扭曲物体的表面亮度。据预测,RS可以发生在超新星遗迹(SNRs)的等离子体。虽然有几位作者报告了SNR中RS的暗示,但迄今为止还没有强有力的观测证据。我们使用XMM-Newton上的反射光栅光谱仪对SNR N49进行了高分辨率X射线光谱分析。N49的RGS光谱显示O VII He $α$线以及O VIII Ly $β$/$α$和Fe XVII(3s-2p)/(3d-2p)比率的高G比率,这不能用来自薄的热等离子体的发射来解释。这些线比可以很好地解释了RS的影响。我们的结果意味着,RS有很大的影响,特别是对测量的氧丰度。

英文摘要:

Resonance scattering (RS) is an important process in astronomical objects, because it affects measurements of elemental abundances and distorts surface brightness of the object. It is predicted that RS can occur in plasmas of supernova remnants (SNRs). Although several authors reported hints of RS in SNRs, no strong observational evidence has been established so far. We perform a high-resolution X-ray spectroscopy of the SNR N49 with the Reflection Grating Spectrometer aboard XMM-Newton. The RGS spectrum of N49 shows a high G-ratio of O VII He$α$ lines as well as O VIII Ly$β$/$α$ and Fe XVII (3s-2p)/(3d-2p) ratios which cannot be explained by the emission from a thin thermal plasma. These line ratios can be well explained by the effect of RS. Our result implies that RS has a large impact particularly on a measurement of the oxygen abundance.

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。

↑