arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0901.3778astro-ph.GA
收藏

带核椭圆星系中超大质量黑洞、速度色散和质量亏损的相关性

Correlations Between Supermassive Black Holes, Velocity Dispersions, and Mass Deficits in Elliptical Galaxies with Cores

John Kormendy, Ralf Bender

摘要:

高动态范围表面光度学在一个配套文件中,使准确测量与椭圆星系的核心恒星光赤字L_def和质量赤字M_def成为可能。我们发现,L_def相关的速度色散σ的主机星系球中心区域外的平均值,可能会受到影响的超大质量黑洞(BH)。我们确认L_def与BH质量MBH相关。此外,分数光赤字L_def/L与BH质量与星系恒星质量之比MBH/M相关。所有这三个相关性的离散度类似于或小于MBH和sigma之间的公知相关性的离散度。新的相关性是显着的二分法之间的椭圆核和中心额外的光。核心光亏缺与MBH和sigma密切相关,但额外光不相关。这支持的建议,额外的轻Es湿合并与星爆,而核心Es干合并。在干合并之后,核心被认为是被BH双星冲刷的,BH双星在轨道衰变时将恒星抛离,或者被BH合并时发射的各向异性引力辐射反冲后沉回中心。直接证据一直难以捉摸。我们将新的相关性解释为连接核心与BH的“吸烟枪”。MBH -σ和MBH-L_def关联一起给出了两种独立的方法来估计核心椭圆星系中的BH质量.

英文摘要:

High-dynamic-range surface photometry in a companion paper makes possible accurate measurement of the stellar light deficits L_def and mass deficits M_def associated with the cores of elliptical galaxies. We show that L_def correlates with the velocity dispersion sigma of the host galaxy bulge averaged outside the central region that may be affected by a supermassive black hole (BH). We confirm that L_def correlates with BH mass MBH. Also, the fractional light deficit L_def/L correlates with MBH/M, the ratio of BH mass to the galaxy stellar mass. All three correlations have scatter similar to or smaller than the scatter in the well known correlation between MBH and sigma. The new correlations are remarkable in view of the dichotomy between ellipticals with cores and those with central extra light. Core light deficit correlates closely with MBH and sigma, but extra light does not. This supports the suggestion that extra light Es are made in wet mergers with starbursts whereas core Es are made in dry mergers. After dry mergers, cores are believed to be scoured by BH binaries that fling stars away as their orbits decay or by BHs that sink back to the center after recoiling from anisotropic gravitational radiation emitted when they merge. Direct evidence has been elusive. We interpret the new correlations as the "smoking gun" that connects cores with BHs. Together, the MBH - sigma and MBH - L_def correlations give us two independent ways to estimate BH masses in core ellipticals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑