We have measured the central stellar velocity dispersion in the host galaxies of 11 BL Lac objects with red-shifts 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 10~(7.9)-10~(9.2) solar mass. 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.
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机译:我们已经测量了11个红移z≤0.125的BL Lac物体的宿主星系中的中心恒星速度色散。速度色散的范围为〜170-370 km s〜(-1),与附近的射电星系相似。利用恒星速度色散与为附近星系定义的黑洞质量之间的相关性,我们得出了太阳质量在10〜(7.9)-10〜(9.2)范围内的黑洞质量的估计值。在高频和低频BL BL Lac对象中,黑洞质量之间没有发现任何显着差异。结合速度色散和先前测得的宿主星系结构参数,我们发现宿主星系位于椭圆星系的基本平面上。这支持了影像学研究的结论,即大多数BL Lac宿主是正常的巨型椭圆星系。
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