Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336.1105l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 15, 1989, p. 1105-1112.
Astronomy and Astrophysics
Astronomy
50
Brightness Temperature, Spaceborne Astronomy, Tdr Satellites, Very Long Base Interferometry, Calibrating, Compton Effect, Earth Orbits, Satellite Antennas, Spaceborne Telescopes
Scientific paper
VLBI observations at 2.3 GHz were conducted using an antenna of the Tracking and Data Relay Satellite System (TDRSS), in geosynchronous orbit, and two ground stations. Twenty-three of 24 sources were detected, on baselines as long as 2.15 earth diameters. These baseline lengths gave the interferometer much better sensitivity to high brightness temperatures than any earth-based observations. Brightness temperatures of 1-4 times the 10 to the 12th K inverse Compton limit were measured for 10 sources, suggesting bulk relativistic motion in these sources. Coherence values of approximately 85 percent for integration times of 360 s were obtained.
Cappallo Roger J.
Dinardo S. J.
Edwards Charles D.
Hirabayashi Hisahi
Inoue Makoto
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