论文标题
银河中心中间质量黑洞的第五个候选人
The Fifth Candidate for an Intermediate-mass Black Hole in the Galactic Center
论文作者
论文摘要
我们报告了高分辨率紧凑型云HCN-0.085-0.094的高分辨率分子线观测结果的结果。 HCN J = 4-3，HCO $^+$ j = 4-3，CS J = 7-6行图像显示，HCN-0.085-0.094主要由三个具有极大速度宽度的小团块组成。这三个团块中的每个集团都有一个5.5 GHz无线电连续体的对应物，其外围向SGR A $^*$。位置关系表明它们的表面已被中央簇中的年轻恒星的紫外光子电离，这表明这些团块与银河系核紧邻。这三个团块中的一个具有一个类似环的结构，具有非常陡峭的速度梯度。这种运动学结构表明围绕质量为$ \ sim 10^4 $ $ m_ \ odot $的点状对象的轨道。恒星对应物的缺失表明点状物体可能是一个静止的黑洞。这一发现增加了我们银河中心地区的另一个中间质量黑洞候选者。
We report the results of high-resolution molecular line observations of the high-velocity compact cloud HCN-0.085-0.094 with the Atacama Large Millimeter/submillimeter Array. The HCN J=4-3, HCO$^+$ J=4-3, and CS J=7-6 line images reveal that HCN-0.085-0.094 consists mainly of three small clumps with extremely broad velocity widths. Each of the three clumps has a 5.5 GHz radio continuum counterpart in its periphery toward Sgr A$^*$. The positional relationship indicates that their surfaces have been ionized by ultraviolet photons from young stars in the central cluster, suggesting the clumps are in close proximity to the Galactic nucleus. One of the three clumps has a ring-like structure with a very steep velocity gradient. This kinematical structure suggests an orbit around a point-like object with a mass of $\sim 10^4$ $M_\odot$. The absence of stellar counterparts indicates that the point-like object may be a quiescent black hole. This discovery adds another intermediate-mass black hole candidate in the central region of our Galaxy.
