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Date and Time of the Query: 2019-05-20 T16:44:40 PDT
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For refcode 2001ApJ...548..244B:
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Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...548..244B New Evidence for the Unified Scheme of BL Lacertae Objects and FR I Radio Galaxies J. M. Bai and Myung Gyoon Lee Received 2000 July 18; accepted 2000 October 6 ABSTRACT In this paper, we collect radio and X-ray observations for most Fanaroff-Riley I (FR I) radio galaxies in the Zirbel-Baum radio galaxy sample and investigate the distribution of the radio-to-X-ray effective spectral index, {alpha}_rx_, to test the unified scheme of BL Lac objects and FR I radio galaxies. It is found that the range of {alpha}_rx_ for FR I radio galaxies is almost the same as that for BL Lac objects, that the distribution of {alpha}_rx_ probably peaks at the same position as BL Lac objects, and that the distribution of {alpha}_rx_ for FR I galaxies is similar to that for BL Lac objects. These suggest that there exist two subclasses of FR I radio galaxies: one is HBL-like, and the other is LBL- like, corresponding to high-energy-peaked (HBL) and low-energy-peaked (LBL) BL Lac objects, respectively. This result is consistent with previous VLA observations and supports the unified scheme of BL Lac objects and FR I radio galaxies. Subject headings: BL Lacertae objects: general-galaxies: active -radiation mechanisms: nonthermal-radio continuum: galaxies -X-rays: galaxies
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