有核星团与活动星系核的重合
The Coincidence of Nuclear Star Clusters and Active Galactic Nuclei
摘要：
我们研究的星系，主机核星团和活动星系核（AGN），这意味着存在一个巨大的黑洞。我们选择了一个样本的176个星系与以前检测到的核星团，范围从椭圆到晚型螺旋。我们使用光谱学和档案无线电和X射线数据在这个样本中搜索活动星系核。我们发现了所有哈勃类型的星系，它们的质量范围很广（10^9-11个太阳质量），既有活动星系核，也有核星团。从光学光谱，我们分类的星系10%的活动星系核和额外的15%的复合，表明活动星系核和恒星形成光谱的混合。有核星系与活动星系核的比例作为星系和核星团质量的函数强烈增加。对于同时具有NC和黑洞的星系，我们发现这两个物体的质量非常相似。然而，在本星系群的核星团中没有发现黑洞，这表明并非所有的星团都有类似质量的黑洞。我们讨论了我们的研究结果的核星团和大质量黑洞的形成的影响。
英文摘要：
We study galaxies that host both nuclear star clusters and active galactic nuclei (AGN) implying the presence of a massive black hole. We select a sample of 176 galaxies with previously detected nuclear star clusters that range from ellipticals to late-type spirals. We search for AGN in this sample using optical spectroscopy and archival radio and X-ray data. We find galaxies of all Hubble types and with a wide range of masses (10^9-11 solar masses) hosting both AGN and nuclear star clusters. From the optical spectra, we classify 10% of the galaxies as AGN and an additional 15% as composite, indicating a mix of AGN and star-formation spectra. The fraction of nucleated galaxies with AGN increases strongly as a function of galaxy and nuclear star cluster mass. For galaxies with both a NC and a black hole, we find that the masses of these two objects are quite similar. However, non-detections of black holes in Local Group nuclear star clusters show that not all clusters host black holes of similar masses. We discuss the implications of our results for the formation of nuclear star clusters and massive black holes.
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