Search for a Frequency Shift of the 21-Centimeter Line from Taurus A near Occultation by Sun

Science  19 Jan 1968:
Vol. 159, Issue 3812, pp. 307-308
DOI: 10.1126/science.159.3812.307


The 21-centimeter absorption line from the direction of Taurus A was used for detection of a shift in frequiency when the source passed near Sun. A possible decrease in frequency of 150 cycles per second was detected, which cannot be caused by general relativity or by the plasma around Sun.