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arXiv 1202.4176astro-ph.HE
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Milky Way - I中超新星遗迹候选者的鉴定活动:G308的钱德拉观测。

Identification campaign of supernova remnant candidates in the Milky Way - I: Chandra observation of G308.3-1.4

C. Y. Hui, K. A. Seo, R. H. H. Huang, L. Trepl, Y. J. Woo, T. -N. Lu, A. K. H. Kong, F. M. Walter

摘要:

ROSAT全天巡天数据为寻找超新星遗迹提供了另一个窗口。在重新检查这些数据档案时,一系列未经确认的扩展X射线物体被认为是有希望的SNR候选者。然而,这些目标中的大多数尚未被最先进的X射线天文台充分探索。为了选择长期识别活动的试点目标,我们已经用钱德拉X射线天文台观察到了最亮的候选者G308.3-1.4。在843 MHz处发现了一个与射电壳层辐射有很好相关的不完全壳层结构。X射线光谱表明存在冲击加热的等离子体。所有这些证据证实G308.3-1.4是SNR。在该视场中探测到的最亮X射线点源也是最靠近G308.3-1.4的几何中心的点源,具有软谱。有趣的时间变化和光学/红外对应物的识别排除了孤立中子星的可能性。另一方面,从Ks波段到R波段的光谱能量分布表明这是一颗晚型星。再加上推定的\sim 1.4小时的周期,V、B带和H-α的有趣过度表明该来源是超新星爆炸(SN)中幸存的紧凑双星的有希望的候选者。

英文摘要:

ROSAT all-sky survey (RASS) data have provided another window to search for supernova remnants (SNRs). In reexamining this data archive, a list of unidentified extended X-ray objects have been suggested as promising SNR candidate. However, most of these targets have not yet been fully explored by the state-of-art X-ray observatories. For selecting a pilot target for a long-term identification campaign, we have observed the brightest candidate, G308.3-1.4, with Chandra X-ray observatory. An incomplete shell-like X-ray structure which well-correlated with the radio shell emission at 843 MHz has been revealed. The X-ray spectrum suggests the presence of a shock-heated plasma. All these evidences confirm G308.3-1.4 as a SNR. The brightest X-ray point source detected in this field-of-view is also the one locates closest to the geometrical center of G308.3-1.4, which has a soft spectrum. The intriguing temporal variability and the identification of optical/infrared counterpart rule out the possibility of an isolated neutron star. On the other hand, the spectral energy distribution from Ks band to R band suggests a late-type star. Together with a putative periodicity of \sim1.4 hrs, the interesting excesses in V, B bands and H-alpha suggest this source as a promising candidate of a compact binary survived in a supernova explosion (SN).

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。

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