论文标题
NGC 4472中球状簇RZ 2109中黑洞候选者的复发X射线耀斑
Recurrent X-ray flares of the black hole candidate in the globular cluster RZ 2109 in NGC 4472
论文作者
论文摘要
我们报告了对位于处女线Galaxy NGC 4472中球状群集RZ 2109中超光的X射线观察的系统分析XMMU XMMU J122939.7+075333。这使其成为球状簇中最好的黑洞候选者之一。尽管大多数观察结果太短且稀疏，无法识别常规模式，但最近三个X射线耀斑的间距与〜34小时的复发时间兼容。如果通过未来的观察结果证实，这种行为以及X射线耀斑的软光谱将与最近在银河核中最近发现的准周期喷发非常相似。遵循这些系统的可能解释之一以及一类奇特的半乳酸X射线瞬变，我们探讨了XMMU J122939.7+075333的可能性可能是由中间质量（M〜700 MSUN）黑洞的白色矮人部分中断的。
We report on the systematic analysis of the X-ray observations of the ultra-luminous X-ray source XMMU J122939.7+075333 located in the globular cluster RZ 2109 in the Virgo galaxy NGC 4472. The inclusion of observations and time intervals ignored in previous works and the careful selection of extraction regions and energy bands have allowed us to identify new flaring episodes, in addition to the ones that made it one of the best black hole candidates in globular clusters. Although most observations are too short and sparse to recognize a regular pattern, the spacing of the three most recent X-ray flares is compatible with a ~34 hours recurrence time. If confirmed by future observations, such behavior, together with the soft spectrum of the X-ray flares, would be strikingly similar to the quasi-periodic eruptions recently discovered in galactic nuclei. Following one of the possible interpretations of these systems and of a peculiar class of extra-galactic X-ray transients, we explore the possibility that XMMU J122939.7+075333 might be powered by the partial disruption of a white dwarf by an intermediate mass (M~700 Msun) black hole.
