15 GHz space VLBI observations using an antenna on a TDRSS satellite

Details 15 GHz space VLBI observations using an antenna on a TDRSS satellite 15 GHz space VLBI observations using an antenna on a TDRSS satellite

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..350l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 350-358. Research supported by NSF.

Astronomy and Astrophysics

Astrophysics

36

Radio Galaxies, Spacecraft Antennas, Tdr Satellites, Very Long Base Interferometry, Block Diagrams, Brightness Temperature, Coherence Coefficient, Data Reduction, Field Of View

Scientific paper

A 4.9 m diameter antenna in earth orbit, part of the Tracking and Data Relay Satellite System, was previously used for space VLBI observations at 2.3 GHz. It has now been used successfully with two ground antennas for VLBI measurements at 15 GHz. Although the sensitivity (gain/system temperature) of the orbiting antenna was a factor of 6 poorer at 15 GHz than at 2.3 GHz, 11 out of 22 extragalactic sources were detected on space-ground baselines, up to a maximum baseline of 1.63 earth diameters. The results suggest that the distribution of source visibilities at 15 and 2.3 GHz are similar for these baseline lengths. Model-dependent brightness temperatures of 1-2.5 x 10 to the 12th K were derived for six sources. This suggests that sources with brightness temperatures in this range are as common at 15 GHz as at 2.3 GHz. The coherence on space-ground baselines (this includes effects due to the phase transfer from the ground to the satellite and the reconstruction of the spacecraft orbit) was 0.76 for 340 s integrations.

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