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arXiv 1202.4677astro-ph.HE
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探索超新星遗迹G308. 4 -1.4

Exploring the supernova remnant G308.4-1.4

Tobias Prinz, Werner Becker

摘要:

目的:我们提出了一个详细的X射线和无线电波长的研究G308.4-1.4,在ROSAT全天巡天和MOST超新星遗迹目录的候选超新星遗迹(SNR),以确定它作为一个SNR。研究方法:利用钱德拉X射线天文台、SWIFT、澳大利亚望远镜紧凑阵列在1.4和2.5千兆赫的观测以及WISE在24 $μ$ m的红外观测,对信噪比候选者及其中心源进行了研究。结果如下:根据G308.4-1.4在X射线、射电和红外波段的形态匹配、X射线波段的光谱能量分布和射电波段的辐射特征,我们认为G308.4-1.4确实是超新星遗迹。G308.4-1.4是一种壳型信噪比。X射线、无线电和红外线辐射仅在遗迹的东部可见。X射线发射可以通过吸收的非平衡碰撞等离子体来最好地描述,该等离子体具有$n_\mathrm{H}=(1.02\pm 0.04) \times 10^{22}$ cm $^{-2}$的氢密度、$6.3^{+1.2}_{-0.7}$百万开氏度的等离子体温度以及相对于太阳值的铁、氖和镁的不足丰度以及硫的过量丰度。SNR具有$α=-0.7\pm0.2$的无线电频带中的频谱指数。详细的分析显示,残骸距离6到12千秒差距,并且祖先恒星在7500年前爆发了$\sim 5000$。探测到两个位于残骸几何中心附近的微弱X射线点源。这两个源在其他波长都没有对应的,使它们成为超新星爆炸的致密残留物的候选者。

英文摘要:

Aims: We present a detailed X-ray and radio wavelength study of G308.4-1.4, a candidate supernova remnant (SNR) in the ROSAT All Sky Survey and the MOST supernova remnant catalogue, in order to identify it as a SNR. Methods: The SNR candidate and its central sources were studied using observations from the Chandra X-ray Observatory, SWIFT, the Australian Telescope Compact Array (ATCA) at 1.4 and 2.5 GHz and WISE infrared observation at 24 $μ$m. Results: We conclude that G308.4-1.4 is indeed a supernova remnant by means of its morphology matching at X-ray, radio and infrared wavelength, its spectral energy distribution in the X-ray band and its emission characteristics in the radio band. G308.4-1.4 is a shell-type SNR. X-ray, radio and infrared emission is seen only in the eastern part of the remnant. The X-ray emission can best be described by an absorbed non-equilibrium collisional plasma with a hydrogen density of $n_\mathrm{H}=(1.02\pm 0.04) \times 10^{22}$ cm$^{-2}$, a plasma temperature of $6.3^{+1.2}_{-0.7}$ million Kelvin and an under-abundance of Iron, Neon and Magnesium, as well as an overabundance in Sulfur with respect to the solar values. The SNR has a spectral index in the radio band of $α=-0.7\pm0.2$. A detailed analysis revealed that the remnant is at a distance of 6 to 12 kpc and the progenitor star exploded $\sim 5000$ to 7500 years ago. Two faint X-ray point sources located near to the remnant's geometrical center are detected. Both sources have no counterpart at other wavelengths, leaving them as candidates for the compact remnant of the supernova explosion.

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