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arXiv 1203.4237astro-ph.HEastro-ph.CO
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超高亮度X射线源ESO 243-49 HLX-1的小合并方案

A minor merger scenario for the ultraluminous X-ray source ESO 243-49 HLX-1

M. Mapelli, L. Zampieri, L. Mayer

摘要:

点状X射线源HLX-1是已知最亮的超亮X射线源,也可能是最强的中等质量黑洞候选者。HLX-1位于S 0星系ESO 243-49中,但相对于核心偏移,其光学对应物被识别为大质量星团。在本文中,我们研究,通过N体/光滑粒子流体动力学模拟,ESO 243-49正在经历(或刚刚经历)与富含气体的低质量晚型星系的小合并的情况。模拟结果表明,在ESO 243-49中观测到的恒星形成率(SFR)是相互作用的结果,并且伴星系已经经历了第二次近心点通过。我们认为HLX-1的对应物与次级星系的核心(可能与核星团)相吻合。我们估计,如果小合并假设是正确的,那么与HLX-1类似的X射线源的数密度约为10^-6 Mpc^-3。

英文摘要:

The point-like X-ray source HLX-1 is the brightest known ultraluminous X-ray source and likely the strongest intermediate-mass black hole candidate. HLX-1 is hosted in the S0 galaxy ESO 243-49, but offset with respect to the nucleus, and its optical counterpart was identified with a massive star cluster. In this paper, we study, through N-body/smoothed particle hydrodynamics simulations, the scenario where ESO 243-49 is undergoing (or just underwent) a minor merger with a gas-rich low-mass late-type galaxy. The simulations suggest that the observed star formation rate (SFR) in ESO 243-49 is a consequence of the interaction and that the companion galaxy already underwent the second pericentre passage. We propose that the counterpart of HLX-1 coincides with the nucleus (and possibly with the nuclear star cluster) of the secondary galaxy. We estimate that, if the minor merger scenario is correct, the number density of X-ray sources similar to HLX-1 is ~10^-6 Mpc^-3.

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