Accession Number:

AD0754079

Title:

327 MHz Observations of the Galactic Center: Possible Detection of a Deuterium Absorption Line,

Descriptive Note:

Corporate Author:

OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF

Report Date:

1972-01-01

Pagination or Media Count:

18.0

Abstract:

The authors observed the spectrum of radiation from the spectrum of radiation from the galactic center in the vicinity of the deuterium ground-state hyperfine transition. With about 100 hours of observing time the spectrum shows r.m.s. fluctuations about 7x10 to the minus 5th power of the on-source power level. An absorption feature at 327.38837 plus or minus 00001 MHz corrected to the local standard of rest has a depth of 2x10 to the minus 4th power of the continuum level. This feature is probably the deuterium line at vLSR -3.7 kms. A discussion is included of the abundance of interstellar deuterium relative to hydrogen and of the difficulties in calculating it. Uncertainties include the optical depth of the corresponding hydrogen absorption line, which is saturated, and the distribution of absorbing clouds. Author

Subject Categories:

  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE