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arXiv 2207.04067astro-ph.HE
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第二个Swift-XRT点源目录中的河外瞬变候选者

Extragalactic transient candidates in the Second Swift-XRT Point Source catalogue

R. A. J. Eyles-Ferris, R. L. C. Starling, P. T. O'Brien, P. A. Evans

摘要:

第二个Swift-XRT点源目录提供了天空覆盖和灵敏度的组合,并为瞬态发现提供了宝贵的机会。我们搜索目录的位置,不活跃和活跃的星系,并确定瞬态候选人与XMM-牛顿和ROSAT的比较。我们恢复167以前已知的瞬变,并找到19个源符合新的来源,估计$\sim65\%$的完整性。这19个新的来源之间的非活动和活动的主机和他们的峰值X射线光度跨度$\sim 10^{42} - 10^{47}$ erg s $^{-1}$大约相等的分裂。我们发现八个是最适合与非热光谱模型和一个黑体。我们还讨论了我们的方法和它的应用,即将举行的生活斯威夫特XRT点源目录的潜在近实时偶然发现$\sim$一些新的X射线瞬变每年。

英文摘要:

The Second Swift-XRT Point Source catalogue offers a combination of sky coverage and sensitivity and presents an invaluable opportunity for transient discovery. We search the catalogue at the positions of inactive and active galaxies, and identify transient candidates by comparison with XMM-Newton and ROSAT. We recover 167 previously known transients and find 19 sources consistent with being new sources, estimating a completeness of $\sim65\%$. These 19 new sources are split approximately equally between inactive and active hosts and their peak X-ray luminosities span $\sim 10^{42} - 10^{47}$ erg s$^{-1}$. We find eight are best fit with non-thermal spectral models and one with a blackbody. We also discuss our methodology and its application to the forthcoming Living Swift-XRT Point Source catalogue for the potential near real time serendipitous discovery of $\sim$ few new X-ray transients per year.

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