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arXiv 2106.13482astro-ph.GAastro-ph.HE
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M82星暴区的X射线超新星遗迹

X-ray supernova remnants in the starburst region of M82

K. Iwasawa

摘要:

我们使用钱德拉X射线天文台的存档数据,在M82的星爆区寻找X射线超新星遗迹(SNRs),总有效曝光时间为620 ks,X射线光谱选择。Fe xxv在6.7 keV处的强线发射是年轻SNR的热冲击气体的特征光谱特征,并且在由X射线双星填充的区域中的离散源中是独特的。我们选择了候选人使用窄带成像针对线过剩,并确定了六个(可能是第七个)X射线SNR。两个以前已知的例子被我们的选择恢复。其中五颗有射电对应物,包括2008年发现的射电超新星SN 2008 iz。它的硬X射线谱具有蓝移的Fe K特征,v ~ -2700 km/s,这两个特征都表明它的年轻。所选信噪比的4-8 keV亮度范围为(0.3-3)e38 erg/s。我们粗略估计了超新星速率,假设更明亮的SNR是年轻的,发现0.06(0.03-0.13)/年,与无线电观测估计的超新星速率和普遍认为的M82恒星形成速率一致,尽管假设的有效性值得怀疑。由选定的X射线信噪比产生的Fe xxv光度之和占M82中心区域观测到的Fe xxv总光度的一半。我们简要地讨论了它的影响,星暴风和Fe二十五排放更明亮的星暴星系。

英文摘要:

We searched for X-ray supernova remnants (SNRs) in the starburst region of M82, using archival data from the Chandra X-ray Observatory with a total effective exposure time of 620 ks with an X-ray spectroscopic selection. Strong line-emission from Fe xxv at 6.7 keV is a characteristic spectral feature of hot, shocked gas of young SNRs and distinctive among the discrete sources in the region populated by X-ray binaries. We selected candidates using narrow-band imaging aimed at the line excess and identified six (and possibly a seventh) X-ray SNRs. Two previously known examples were recovered by our selection. Five of them have radio counterparts, including the radio supernova SN2008iz, which was discovered as a radio transient in 2008. It shows a hard X-ray spectrum with a blueshifted Fe K feature with v ~ -2700 km/s, both of which suggest its youth. The 4-8 keV luminosities of the selected SNRs are in the range of (0.3-3)e38 erg/s. We made a crude estimate of the supernova rate, assuming that more luminous SNRs are younger, and found 0.06 (0.03-0.13) /yr, in agreement with the supernova rates estimated by radio observations and the generally believed star formation rate of M82, although the validity of the assumption is questionable. A sum of the Fe xxv luminosity originating from the selected X-ray SNRs consists of half of the total Fe xxv luminosity observed in the central region of M82. We briefly discuss its implications for starburst winds and the Fe xxv emission in more luminous starburst galaxies.

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