The quiescent level of Cygnus X-3 at 2.25 and 8.3 GHz: 1988-1992

Details The quiescent level of Cygnus X-3 at 2.25 and 8.3 GHz: 1988-1992 The quiescent level of Cygnus X-3 at 2.25 and 8.3 GHz: 1988-1992

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..179w&link_type=abstract

The Astronomical Journal, vol. 108, no. 1, p. 179-187

Astronomy and Astrophysics

Astronomy

58

Cygnus Constellation, Flux Density, Light Curve, Radio Astronomy, Radio Emission, Stellar Flares, X Ray Binaries, Accretion Disks, Neutron Stars, Stellar Systems

Scientific paper

We report flux densities for Cygnus X-3 at 2.25 and 8.3 GHz for 1988-1992 (2.7 and 8.1 GHz prior to 1989.75). These flux densities are presented on a scale which emphasizes the relationship between very low flux densities (less than 30 mJy) and the evolution of major flares in Cygnus X-3. The quiescent radio flux density of Cygnus X-3 was observed to drop from roughly 80 to 14 mJy plus or minus 6 mJy at 2.25 GHz and from 90 to 22 mJy plus or minus 9 mJy at 8.3 GHz during six pre-flare intervals from 1990 through 1992. The duration of unusually low flux density varied from three days to two months. Lower quiescent flux densities than normal (35-60 mJy) also occurred during periods of active small flaring (less than 1 Jy) but were not as well defined. These periods of very low flux density persist longer than the opacity which occurs for a few days after onset of the flare in the expanding synchrotron cloud model of Marscher & Brown (ApJ, 200, 719 (1975)) but may be explained by quenching of the quiescent radio emission during periods of heavy accretion prior to major radio flares (Kitamoto et. al., A&A, 281, L85 (1994)).

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