球状星团候选黑洞RZ2109中宽[ OIII ]发射线的缓慢上升和下降
Slow Decline and Rise of the Broad [OIII] Emission Line in Globular Cluster Black Hole Candidate RZ2109
摘要：
RZ 2109是第一个被证明拥有超亮X射线源的河外球状星团。RZ 2109是特别值得注意的，因为光学光谱显示它具有广泛的发光[OIII] 4959，5007发射，同时也没有可检测到的氢发射。RZ 2109的X射线和光学特征使其成为一个很好的候选者，成为一个从白矮星施主吸积的恒星质量的黑洞（即超紧黑洞X射线双星）。在本文中，我们介绍了2007年至2018年[OIII]5007发射线的光学光谱监测。我们发现，在2016-2018年的最近观测中，发射线的通量明显低于2007-2011年的早期观测。我们还探讨了行为的发射线形状随时间的推移。发射线的核心和两翼都随着时间的推移而下降，有证据表明核心的下降速度比两翼快。然而，最近的观测（2019年）意外地显示发射线核心重新变亮。
英文摘要：
RZ2109 is the first of several extragalactic globular clusters shown to host an ultraluminous X-ray source. RZ2109 is particularly notable because optical spectroscopy shows it has broad, luminous [OIII] 4959,5007 emission, while also having no detectable hydrogen emission. The X-ray and optical characteristics of the source in RZ2109 make it a good candidate for being a stellar mass black hole accreting from a white dwarf donor (i.e. an ultracompact black hole X-ray binary). In this paper we present optical spectroscopic monitoring of the [OIII]5007 emission line from 2007 to 2018. We find that the flux of the emission line is significantly lower in recent observations from 2016-2018 than it was in earlier observations in 2007-2011. We also explore the behaviour of the emission line shape over time. Both the core and the wings of the emission line decline over time, with some evidence that the core declines more rapidly than the wings. However, the most recent observations (in 2019) unexpectedly show the emission line core re-brightening.
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