Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...447..752s&link_type=abstract
Astrophysical Journal v.447, p.752
Astronomy and Astrophysics
Astronomy
30
Stars: Binaries: Close, Ism: Jets And Outflows, Stars: Individual Constellation Name: Cygnus X-3, X-Rays: Stars
Scientific paper
Cygnus X-3 underwent a large outburst beginning on 1985 October 2 and reached a peak flux density of 18 Jy at 11.1 cm on October 10. Between October 7 and October 19 we performed seven snapshot observations at a wavelength of 6 cm using telescopes of the European VLBI Network. The source structure may be represented by three components, consistent with a pair of symmetrical jets emanating from a central compact object. The component sizes are consistent with broadening by interstellar scattering to 16±6 mas. Comparison with other data shows that the frequency dependence of the scattered image varies as v-2.07±0.04 and that the scattering toward Cygnus X-3 is enhanced compared with other Galactic sources. We estimate that the emission in the symmetrical components has an apparent proper motion of 4.2 mas day-1 or 0.3c at a distance of 10 kpc. Study of the VLBI structure and total flux density variability yields an upper limit for the distance to Cygnus X-3 of 15 kpc.
Fiedler R.
Hjellming Robert
Johnston Ken J.
Molnar Larry A.
Pooley Guy G.
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