Spectral line interferometry with independent time standards at stations separated by 845 kilometers.
An upper limit of 0.02 second of arc has been determined for a hydroxyl radical (OH) emission region associated with the radio source W3, with the use of a Michelson interferometer consisting of two radio telescopes 845 kilometers apart. Timing was provided at the stations by independent atomic frequency standards. The 1665-megahertz radiation was translated to video frequency and recorded digitally on magnetic tapes which were later processed by computer, yielding fringe phase and amplitude as a function of frequency over the received bandwidth.
Moran
J M
JM
Crowther
P P
PP
Burke
B F
BF
Barrett
A H
AH
Rogers
A E
AE
Ball
J A
JA
Carter
J C
JC
Bare
C C
CC