The exceptionally large flux variability of the quasar 1055 + 018 at metre wavelengths

Details The exceptionally large flux variability of the quasar 1055 + 018 at metre wavelengths The exceptionally large flux variability of the quasar 1055 + 018 at metre wavelengths

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140l..19g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. L19-L22.

Astronomy and Astrophysics

Astronomy

19

Quasars, Radiant Flux Density, Radio Emission, Radio Sources (Astronomy), Brightness Temperature, Lunar Occultation, Radio Spectra, Scintillation, Very Long Base Interferometry

Scientific paper

Combining the published VLBI and lunar occultation data has delineated the quiescent radio structure of the quasar 1055 + 018 in terms of four components, of which two are rather compact (less than 0.1 arcsec). If an apparent variation of either of these two components is responsible for the recently reported outburst of flux density of the quasar, this would imply a rise in flux density of that component in the course of less than about 4 years by factors of more than about 20 at 80 MHz and more than about 3 at 160 MHz. The probability of such a variation occurring due to slow interstellar scintillations is shown to be exceedingly small (less than 0.0001). An attempt to explain the flux variation in terms of a newly created relativistically approaching weak component of incoherent synchrotron emission seems to require for the bulk motion an extremely large Doppler factor delta greater than about 100.

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