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arXiv 1409.0591astro-ph.GA
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M31的20 cm VLA射电连续谱研究-图像和点源星表DR2:超新星遗迹样品的提取

20 cm VLA Radio-Continuum Study of M31 - Images and Point Source Catalogues DR2: Extraction of a supernova remnant sample

T. J. Galvin, M. D. Filipovic

摘要:

我们目前的数据发布2的点源目录创建一系列先前构建的无线电连续图像M31在λ =20厘米(nu=1.4 GHz)从存档的VLA观测。总的来说,我们确定了916个独特的离散无线电源在整个M31领域的集合。将这些探测到的源与Gelfand等人(2004年)在λ =92 cm处列出的源进行比较,得出了98个源的光谱指数。这些来源中的大多数(73%)的光谱指数α <-0.6,表明它们的发射主要是非热性质的,这是背景物体和超新星遗迹的典型特征。此外,我们调查了存在的无线电对应的一些156 SNR和SNR候选人,发现只有13个这些对象在我们的图像中的5弧秒搜索区域内。辅助光学,无线电和X射线目录交叉引用,突出了一个小人口的SNR和SNR候选人共同的多频域。

英文摘要:

We present Data Release 2 of the Point Source Catalogue created from a series of previously constructed radio-continuum images of M31 at lambda=20 cm (nu=1.4 GHz) from archived VLA observations. In total, we identify a collection of 916 unique discrete radio sources across the field of M31. Comparing these detected sources to those listed by Gelfand et al. (2004) at lambda=92 cm, the spectral index of 98 sources has been derived. The majority (73%) of these sources exhibit a spectral index of alpha <-0.6, indicating that their emission is predominantly non-thermal in nature, which is typical for background objects and Supernova Remnants (SNRs). Additionally, we investigate the presence of radio counterparts for some 156 SNRs and SNR candidates, finding a total of only 13 of these object in our images within a 5 arcsec search area. Auxiliary optical, radio and X-ray catalogs were cross referenced highlighting a small population of SNR and SNR candidates common to multi-frequency domains.

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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