The Parsec-Scale Radio Structure of X-Ray-Selected BL Lacs

Details The Parsec-Scale Radio Structure of X-Ray-Selected BL Lacs The Parsec-Scale Radio Structure of X-Ray-Selected BL Lacs

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5031r&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #50.31; Bulletin of the American Astronomical Society, Vol. 31, p.901

Astronomy and Astrophysics

Astronomy

Scientific paper

We present first-epoch VLBA observations obtained as part of a program to study the parsec-scale radio structure of a sample of twelve X-ray-selected BL Lacs (XBLs) chosen to span the observed range of spectral energy distributions for XBLs. Whereas radio-selected BL Lacs (RBLs) show a bimodal distribution of parsec- and kpc-scale jet alignment angles, all of the XBLs that are resolved on poth parsec- and kpc-scales have well-aligned jets. This can be interpreted as support for orientation models in which XBLs are believed to be seen further off-axis than RBLs. Alternatively, XBL jets may be intrinsically straighter than those found in RBLs. This may be due, perhaps, to their intrinsically lower power levels.

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