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arXiv 1107.4103astro-ph.CO
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低质量黑洞的黑洞质量和膨胀光度

Black Hole Mass and Bulge Luminosity for Low-mass Black Holes

Yan-Fei Jiang, Jenny E. Greene, Luis C. Ho

摘要:

研究了维里黑洞质量小于10^6太阳质量的星系的核球星等与中心黑洞质量之间的标度关系。基于仔细的图像分解的快照哈勃太空望远镜I波段的调查,我们发现,这些黑洞主要是在星系中的pseudobulges。在这里,我们表明,低质量的赝核球的\mbulge\关系与BH质量大于10^7太阳质量的经典核球有很大的不同。从光谱上看,在固定黑洞质量的情况下,膨胀的光度范围要宽得多,平均光度也更大。这种趋势对于Bentz等人的活动星系和Gultekin等人的非活动星系都成立,并且无法用恒星星族的差异来解释,因为当我们使用动力学凸出质量时,它仍然存在。换句话说,对于我们的样品,凸起和BH质量之间的比率比$\sim 1000$大得多。这与最近提出的黑洞质量不随赝球光度成比例的观点是一致的。低质量的标度关系似乎变平,与Volonteri和Natarajan对大规模种子黑洞的预测一致。

英文摘要:

We study the scaling between bulge magnitude and central black hole (BH) mass in galaxies with virial BH masses < 10^6 solar mass. Based on careful image decomposition of a snapshot Hubble Space Telescope I-band survey, we found that these BHs are found predominantly in galaxies with pseudobulges. Here we show that the \mbulge\ relation for the pseudobulges at low mass is significantly different from classical bulges with BH masses >10^7 solar mass. Specfically, bulges span a much wider range of bulge luminosity, and on average the luminosity is larger, at fixed black hole mass. The trend holds both for the active galaxies from Bentz et al. and the inactive sample of Gultekin et al. and cannot be explained by differences in stellar populations, as it persists when we use dynamical bulge masses. Put another way, the ratio between bulge and BH mass is much larger than $\sim 1000$ for our sample. This is consistent with recent suggestions that black hole mass does not scale with the pseudobulge luminosity. The low-mass scaling relations appear to flatten, consistent with predictions from Volonteri & Natarajan for massive seed BHs.

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