On the Difference of Quasars and BL Lac Objects

Details On the Difference of Quasars and BL Lac Objects On the Difference of Quasars and BL Lac Objects

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..402..307l&link_type=abstract

Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies ASP Conference Series, Vol. 402, proceedings o

Astronomy and Astrophysics

Astrophysics

Scientific paper

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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