Other
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5604l&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #56.04; Bulletin of the American Astronomical Society, Vol. 31, p.1458
Other
Scientific paper
We are using the VSOP mission to observe a complete sample of Pearson-Readhead Survey AGNs at 4.8 GHz to determine core brightness temperatures and parsec-scale jet properties. The Pearson-Readhead sample has been used for extensive ground-based VLBI survey studies, and is ideal for a VSOP survey because the sources are strong, the VSOP u-v coverages are especially good above +35o declination, and multi-epoch ground-based VLBI data and other existing supporting data on these sources exceed that of any other sample. To date we have imaged a majority of the 31 objects in our sample. In addition, we are obtaining matched-resolution 15 GHz observations using the VLBA at epochs close in time to the space VLBI observations to investigate the spectral indices of the source components at high resolution. We discuss our brightness temperature measurements obtained so far, and interpret our results in the framework of the standard relativistic beaming model for jets in radio-loud AGNs. We gratefully acknowledge the VSOP Project, which is led by the Japanese Institute of Space and Astronautical Science in cooperation with many organizations and radio telescopes around the world. This research was performed in part at the Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA.
Hirabayashi Hisahi
Inoue Makoto
Jones Daniel J.
Kobayashi Hirotada
Lister Matthew L.
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