Space VLBI Observations of 3C279 at 1.6 and 5 GHz
P.G. Edwards, H. Hirabayashi
We present VLBI Space Observatory Programme
(VSOP) observations of the gamma-ray blazar
3C279 at 1.6 and 5 GHz made with the HALCA satellite and the VLBA.
The quasar core and a secondary component 3 milliarcseconds away
dominate the compact radio emission, with synchrotron self-absorption in the core
resulting in the jet component appearing brighter at 1.6 GHz.
The 1.6 GHz image also shows complex emission from a jet extending to the southwest.
A spectral index map was made
by combining the VSOP 1.6 GHz image with a matched-resolution ground-baseline only
5 GHz image from the VSOP observation on the following day.
The spectral index map shows the core to have a highly inverted spectrum
consistent with compact self-absorbed synchrotron emission.
Model fits to the
VSOP visibilities reveal high brightness temperatures ( > 1012) that cannot be measured with
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:19.