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NGC 6822中一颗分解超新星遗迹的X射线/光学/射电观测

X-ray/Optical/Radio Observations of a Resolved Supernova Remnant in NGC 6822

A. K. H. Kong, L. O. Sjouwerman, B. F. Williams

摘要:

超新星遗迹(SNR),Ho 12,位于矮不规则星系NGC 6822的中心,以前在X射线,光学和无线电波段被观测到。通过使用档案钱德拉和地面的光学数据,我们发现,SNR是空间分辨的X射线和光学。此外,我们还获得了一个~5”分辨率的无线电图像的信噪比。这些观测提供了迄今为止该星系中X射线/光学/无线电SNR的最高空间分辨率成像。多波长形态、X射线光谱和变异性以及窄带光学成像与SNR一致。SNR是一个直径约为10”(24 pc)的贝壳状物体。SNR的形态在波长上是一致的,而Chandra光谱可以很好地拟合非平衡电离模型,电子温度为2.8 keV,0.3-7 keV光度为1.6e37 erg/s。SNR的年龄估计为1700-5800年。

英文摘要:

The supernova remnant (SNR), Ho 12, in the center of the dwarf irregular galaxy NGC 6822 was previously observed at X-ray, optical, and radio wavelengths. By using archival Chandra and ground-based optical data, we found that the SNR is spatially resolved in X-rays and optical. In addition, we obtained a ~5" resolution radio image of the SNR. These observations provide the highest spatial resolution imaging of an X-ray/optical/radio SNR in that galaxy to date. The multi-wavelength morphology, X-ray spectrum and variability, and narrow-band optical imagings are consistent with a SNR. The SNR is a shell-shaped object with a diameter of about 10" (24 pc). The morphology of the SNR is consistent across the wavelengths while the Chandra spectrum can be well fitted with a nonequilibrium ionization model with an electron temperature of 2.8 keV and a 0.3-7 keV luminosity of 1.6e37 erg/s. The age of the SNR is estimated to be 1700-5800 years.

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