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arXiv 2109.07003astro-ph.GAastro-ph.SR
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利用THOR寻找和鉴别年轻致密星系超新星遗迹

Search for and Identification of Young Compact Galactic Supernova Remnants Using THOR

S. Ranasinghe, D. Leahy, J Stil

摘要:

年轻的超新星遗迹(SNRs)具有较小的角尺寸可能会从现有的无线电SNR目录中丢失,这是由于观测限制和选择效应造成的。为了寻找新的紧凑型射电信噪比候选者,我们搜索了银河系第一象限的高角分辨率(25”)THOR射电巡天。我们选择了非热辐射源。HI吸收光谱和通道图被用来确定哪些源是银河系,并估计它们的距离。发现了两个新的紧凑SNR:G31.299 $-$ 0.493和G18.760 $-$ 0.072,其中后者是先前建议的SNR候选。到这些SNR的距离分别为5.0 $\pm$ 0.3 kpc和4.7 $\pm$ 0.2 kpc。根据银河系中的SN率或已知SNR的统计,我们估计有15个$-$ 20尚未检测到的紧凑的SNR在银河系和THOR调查区应包含三个或四个。我们检测到的两个SNR(一半的预期数量)是一致的,与集成的SNR通量密度的分布相比,与THOR的灵敏度限制。

英文摘要:

Young Supernova remnants (SNRs) with smaller angular sizes are likely missing from existing radio SNR catalogues, caused by observational constraints and selection effects. In order to find new compact radio SNR candidates, we searched the high angular resolution (25") THOR radio survey of the first quadrant of the galaxy. We selected sources with non-thermal radio spectra. HI absorption spectra and channel maps were used to identify which sources are galactic and to estimate their distances. Two new compact SNRs were found: G31.299$-$0.493 and G18.760$-$0.072, of which the latter was a previously suggested SNR candidate. The distances to these SNRs are 5.0 $\pm$ 0.3 kpc and 4.7 $\pm$ 0.2 kpc, respectively. Based on the SN rate in the galaxy or on the statistics of known SNRs, we estimate that there are 15$-$20 not yet detected compact SNRs in the galaxy and that the THOR survey area should contain three or four. Our detection of two SNRs (half the expected number) is consistent with the THOR sensitivity limit compared with the distribution of integrated flux densities of SNRs.

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