Constraints on Relativistic Beaming Models of BL Lacs

Details Constraints on Relativistic Beaming Models of BL Lacs Constraints on Relativistic Beaming Models of BL Lacs

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.8414k&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #84.14; Bulletin of the American Astronomical Society, Vol. 27, p.1411

Astronomy and Astrophysics

Astronomy

Scientific paper

We have recently completed a VLA imaging survey of the radio properties of the HEAO-1 sample of X-ray selected BL Lacertae objects (XBLs). The core and extended luminosities are compared with similar data for radio-selected BL Lacs (RBLs) and radio galaxies. We find that all three classes show parallel correlations between the radio luminosity of the core and extended radio luminosities with Pext ~ Pcore(1.2) . The cores of the XBLs and RBLs are on average 160 and 4000 times (respectively) stronger than the galaxy cores when normalized to a constant extended radio luminosity. This result is consistent with the expectations of unified schemes connecting BL Lacertae objects and radio galaxies via different jet orientations. The high level of core enhancement in BL Lacertae objects is incompatible with simple models assuming a continuous jet, and instead requires jets with a few discrete components. Assuming a constant jet Lorentz factor Gamma , the core enhancements require that Gamma > 4.5 and probably exceed Gamma = 6, with average angles to the line of sight of approximately 60(deg) , 20(deg) , and 10(deg) for the galaxies, XBLs, and RBLs (respectively).

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