VSOP Observations of the Gamma-Ray Sources J1733-1304, J1625-2527, and J1015+4926

Details VSOP Observations of the Gamma-Ray Sources J1733-1304, J1625-2527, and J1015+4926 VSOP Observations of the Gamma-Ray Sources J1733-1304, J1625-2527, and J1015+4926

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57..295n&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.57, No.2, pp. 295-308

Astronomy and Astrophysics

Astronomy

1

Galaxies: Active, Galaxies: Jets, Radio Continuum: Galaxies, Techniques: Interferometric

Scientific paper

We present images from VSOP (VLBI Space Observatory Programme) and VLBA (Very Long Baseline Array) observations of the active galactic nuclei J1733-1304, J1625-2527, and J1015+4926. These three 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 1012 K. Evidence for compactness in gamma-ray emitting AGNs is also given by the variability seen from gamma-ray to radio frequencies. In this report, 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 previous Tb of 1995-1997. 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 made 2.2yr earlier suggests the existence of stationary jet components in this source.

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