Detection of The..... Transition of 18OH at 1584-MHZ Toward SAGITTARIUS-B2

Details Detection of The..... Transition of 18OH at 1584-MHZ Toward SAGITTARIUS-B2 Detection of The..... Transition of 18OH at 1584-MHZ Toward SAGITTARIUS-B2

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93...82w&link_type=abstract

Publications of the Astronomical Society of the Pacific, Vol. 93, P. 82, 1981

Astronomy and Astrophysics

Astronomy

6

Scientific paper

Observations of the 1584 MHz line of 18OH (corresponding to the 1612 MHz line of 16OH) give for the +60 km s-1 cloud associated with Sgr B2 an abundance ratio [16OH]:[18OH] of 220 ± 20 as compared with the terrestrial value of 490.
Departures from LTE for the satellite lines are smaller for 15OH than for 16OH, as might be expected if optical depths of the IR transitions connecting the different A-doublets are small at the 15OH wavelengths.

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