Other
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1687k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 5, p. 1687-1705.
Other
145
Bl Lacertae Objects, Imaging Techniques, Radio Emission, Very Large Array (Vla), High Resolution, Image Resolution, Linear Polarization
Scientific paper
5 GHz VLA observations of 17 BL Lac objects with bright radio cores at both high and low resolution are reported. Extended emission is detected around most objects. None of the sources observed at low resolution show evidence of giant halos on the scale of tens of arcmin. In general, the sources with the most luminous extended emission exhibit FR II characteristics in both morphology and polarization, and less luminous sources exhibit FR I characteristics. Thus, the parent population of the BL Lac objects contains both FR I and FR II radio sources. No BL Lac objects are found that clearly exhibit quasarlike polarization at milliarcsec resolution. This argues against the view that the more luminous BL Lac objects are simply an extension of the quasar/OVV population, or that most BL Lac objects are gravitationally microlensed images of distant quasars. Other properties are generally consistent with the view the BL Lac objects are normal radio galaxies whose jets make a small angle to the line of sight.
Gabuzda Denise C.
Kollgaard Ron I.
Roberts David H.
Wardle John F. C.
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