Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406..430p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 2, p. 430-446.
Astronomy and Astrophysics
Astronomy
79
Bl Lacertae Objects, Galactic Structure, Radio Astronomy, Radio Galaxies, X Ray Sources, Morphology, Relativistic Electron Beams, Spectral Emission
Scientific paper
Arcsecond-size radio structure for a complete sample of 14 X-ray-selected BL Lac objects (XBLs) from the Einstein Extended Medium-Sensitivity Survey is presented. Most objects possess radio morphologies which are similar to those of nearby Fanaroff-Riley type 1 (FR 1) radio galaxies once the effects of surface brightness dimming and beam dilution as a function of redshift are taken into account. In order to test the beamed FR 1 hypothesis for BL Lac objects, the core and extended power levels are determined for these sources and compared with samples of radio-selected BL Lac objects (RBLs) and FR 1 from galaxies from the literature. RBLs and XBLs are found to possess extended (and thus unbeamed) power levels and the largest angular sizes similar to those of the FR 1 galaxies both supporting the beaming hypothesis and a common parent population for XBLs and RBLs.
Perlman Eric Steven
Stocke John T.
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