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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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