Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18310709w&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #107.09; Bulletin of the American Astronomical Society, Vol. 25, p.1450
Other
1
Scientific paper
We present Global VLBI images of the quasar 3C279. In the core and shocks in the jet, inverse Compton scattering may produce x-ray and gamma -ray photons detected by ROSAT and CGRO. The observations were made at 5 and 22 GHz during 1992 and 1993 using 12-16 antennas, including seven VLBA antennas. The synthesized beam (FWHM) was ~ 1 milliarcsecond ( ~ 3 pc) at 5 GHz and ~ 0.25 milliarcseconds at 22 GHz. The 5 GHz image of June 1992 shows a core-jet structure. A bright blob in the jet was brighter than the core at this epoch. The jet appeared clumpy within ~ 6 milliarcseconds of the core, then it became diffuse for another ~ 10 milliarcseconds until it faded below the noise level. The 22 GHz image of November 1992 shows a slightly resolved core and a clumpy jet. A new component appeared to be separating from the core. The 22 GHz core-jet structure had a total extent of about 2 milliarcseconds, with the jet terminating abruptly. Possible relationships between changes in the core-jet structures and the x-ray and gamma -ray emission will be discussed.
Madejski Greg
Maraschi Laura
Unwin Stephen C.
Urry Claudia Megan
Wehrle Ann E.
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