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arXiv 1809.01664astro-ph.GA
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在银河系中心称量IMBH候选物CO-0 .40-0.22*

Weighing the IMBH candidate CO-0.40-0.22* in the Galactic Centre

Alessandro Ballone, Michela Mapelli, Mario Pasquato

摘要:

在距离银河系中心60 pc的致密云CO-0.40-0.22中观测到的高速度梯度,使其发现者将附近的mm连续谱发射体CO-0.40-0.22* 与中等质量黑洞(IMBH)候选者鉴别出来。我们描述了CO-0.40-0.22和IMBH之间的相互作用,通过一个简单的分析模型和流体动力学模拟。通过这样的计算,我们得到了少量$10^4 \times \; M_{\odot}$的CO-质量下限为0.40-0.22*。这个结果倾向于排除在银河系中心附近形成这样的大质量黑洞。另一方面,如果CO-0.40-0.22* 诞生于银河系周围的暗物质晕或球状星团中,那么它在宇宙学时间尺度上可能已经被带到了这样的距离。

英文摘要:

The high velocity gradient observed in the compact cloud CO-0.40-0.22, at a projected distance of 60 pc from the centre of the Milky Way, has led its discoverers to identify the closeby mm continuum emitter, CO-0.40-0.22*, with an intermediate mass black hole (IMBH) candidate. We describe the interaction between CO-0.40-0.22 and the IMBH, by means of a simple analytical model and of hydrodynamical simulations. Through such calculation, we obtain a lower limit to the mass of CO-0.40-0.22* of few $10^4 \times \; M_{\odot}$. This result tends to exclude the formation of such massive black hole in the proximity of the Galactic Centre. On the other hand, CO-0.40-0.22* might have been brought to such distances in cosmological timescales, if it was born in a dark matter halo or globular cluster around the Milky Way.

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