The Black Hole Masses and Host Galaxies of BL Lacertae Objects
The Black Hole Masses and Host Galaxies of BL Lacertae Objects
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DOI：
10.1086/345083
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发表时间：
2002-09
期刊：
影响因子：
--
通讯作者：
A. Barth;L. Ho;W. Sargent
中科院分区：
文献类型：
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作者：
A. Barth;L. Ho;W. Sargent
我们测量了11个红移z ≤ 0.125的BL Lac天体的主星系中心恒星速度色散。速度色散的范围为~170-370 km s-1，与附近的射电星系相似。利用恒星速度色散和黑洞质量之间的相关性，我们得到了黑洞质量的估计范围在107.9-109.2 M之间。我们没有发现任何显着差异的黑洞质量在高频峰值和低频峰值BL Lac对象。结合速度色散与先前测量的宿主星系的结构参数，我们发现，宿主星系位于椭圆星系的基本平面。这支持了成像研究的结论，即大多数BL Lac宿主是正常的巨椭圆星系。
We have measured the central stellar velocity dispersion in the host galaxies of 11 BL Lac objects with redshifts z ≤ 0.125. The range of velocity dispersions, ~170-370 km s-1, is similar to that of nearby radio galaxies. Using the correlation between stellar velocity dispersion and black hole mass defined for nearby galaxies, we derive estimates of the black hole masses in the range 107.9-109.2 M☉. We do not find any significant difference between the black hole masses in high-frequency-peaked and low-frequency-peaked BL Lac objects. Combining the velocity dispersions with previously measured host galaxy structural parameters, we find that the host galaxies lie on the fundamental plane of elliptical galaxies. This supports the conclusions of imaging studies that the majority of BL Lac hosts are normal giant elliptical galaxies.