Extended radio structure of BL Lac type objects

Details Extended radio structure of BL Lac type objects Extended radio structure of BL Lac type objects

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.298..140s&link_type=abstract

Nature, vol. 298, July 8, 1982, p. 140-142.

Astronomy and Astrophysics

Astronomy

24

Bl Lacertae Objects, Extragalactic Radio Sources, Spatial Distribution, Astronomical Catalogs, Astronomical Maps, Blazars, Cores, Halos

Scientific paper

Observations are reported which support the concept that BL Lac objects feature a core-halo morphology similar to Blazar models of quasars without a conspicuous jet. Radio telescope observations made between 1978-1980 with linked interferometers at 0.41, 0.96, and 1.67 GHz of BL Lac objects revealed compact nuclear cores with flat or inverted radio spectra in all but two cases. Extended emissions were found to be consistently diffuse and no evidence for a compact structure away from the core was detected. Structural details of active polarized quasars and the BL Lac objects were compared and the absence of the jet-like forms attached to the cores of BL Lac objects is suggested to be due to either a rich intracluster environment, a difference in the nature of the underlying galaxy, or a more oblique orientation of quasars relative to the viewer on earth.

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