Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..402..112n&link_type=abstract
Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies ASP Conference Series, Vol. 402, proceedings o
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present results from VSOP and VLBA observations of the active galactic nuclei J1733-1304, J1625-2527, and J1015+4926. These sources have been identified as possible counterparts to gamma-ray sources in the third EGRET catalog. In general, the counterparts to extragalactic EGRET sources have very compact structure, with brightness temperatures (Tb) greater than 1011-1012K. We compare the images of the three sources with previously published images and also examine jet motions and spectral indices. The measured Tb of J1733-1304 are an order of magnitude lower than those of previous measurements, suggesting the VSOP observations were made while the source was in a relatively quiescent state. The relatively low Tb of J1625-2527 is also consistent with the highly variable nature of this source. A comparison of the VSOP observation of J1015+4926 with a VLBA image suggests the existence of stationary jet components.
Edwards Philip G.
Murata Yoshitaka
Nakagawa Akiharu
Omodaka Toshihiro
Wajima Kiyoaki
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