A rapid outburst of BL Lac at 2.72 GHz

Details A rapid outburst of BL Lac at 2.72 GHz A rapid outburst of BL Lac at 2.72 GHz

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113..348r&link_type=abstract

Astronomy and Astrophysics, vol. 113, no. 2, Sept. 1982, p. 348, 349.

Astronomy and Astrophysics

Astrophysics

3

Bl Lacertae Objects, Extragalactic Radio Sources, Radiant Flux Density, Radio Bursts, Astronomical Models, Brightness Temperature, Lorentz Force, Relativistic Electron Beams

Scientific paper

Monitoring the flux density of BL Lac at a frequency of 2.72 GHz, a rapid outburst in August/September 1980 lasting for 20 d and reaching a maximum in flux density of 2.2 Jy was observed in detail. These observations are discussed in terms of current models for compact extragalactic sources. The light travel size implies brightness temperatures of not less than 10 to the 16th K. Alternatively, relativistic beam models imply maximum Lorentz factors of gamma greater than 20. Explanations using variations in the optical depth of the source need quite special geometric assumptions.

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