1803 + 784 - A BL Lacertae object with remarkable radio properties

Details 1803 + 784 - A BL Lacertae object with remarkable radio properties 1803 + 784 - A BL Lacertae object with remarkable radio properties

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..313s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 313-318.

Astronomy and Astrophysics

Astronomy

16

Bl Lacertae Objects, Radio Sources (Astronomy), Astronomical Spectroscopy, Infrared Spectra, Radiant Flux Density, Radio Spectra, Very Long Base Interferometry

Scientific paper

The new radio observations presented here show that the BL Lac object 1803 + 784 is perhaps the largest D2 source known, with an overall extent of at least 345 kpc. Although there may be weak emission from a counter-component, the source is clearly quite symmetrical. Observations perform at 49 cm show that the spectrum of the southern lobe is typical of an extended nonthermal radio source. Its presence poses the usual dilemma for Doppler-boosted interpretations of extended source symmetries: if the extension lies nearly along the line of sight then the deprojected size is extremely large, if it lies closer to the plane of the sky then the absence of a counter-component must be due to intrinsic brightness differences. The total radio spectrum and known VLBI structure of the core component pose additional difficulties. The most striking feature of the radio spectrum is its nearly constant flux density. It is suggested that the emission below 1 GHz may be due to other components of between 30 and 200 mas.

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