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Paper: On the Difference of Quasars and BL Lac Objects
Volume: 402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies
Page: 307
Authors: Liu, X.
Abstract: We analyze the two differences between radio-loud quasars and BL Lacs: the lack of emission lines in BL Lacs, and the different position angles of the jets. We propose that BL Lacs have much less gas and are possibly optically-thin near the central engine in nuclei. This could be attributed to the orbiting of binary black holes in a very late merging stage.
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