Accession Number : AD0724763

Title :   Detection of Interstellar OH in Two External Galaxies,

Corporate Author : OWENS VALLEY RADIO OBSERVATORY PASADENA CALIF

Personal Author(s) : Weliachew,L.

Report Date : 1971

Pagination or Media Count : 22

Abstract : Molecular OH lines at 1665 and 1667 MHz have been detected in absorption in the spiral galaxy NGC 253 and the irregular galaxy M82. This is the first time interstellar molecular lines, whether radio or optical, have been observed outside the Galaxy. Observations were made with the Owens Valley interferometer, thus the amplitude and phase of the absorption features could both be measured. The run of phase versus velocity agrees with the sense of rotation of both galaxies. Abundances close to those found in the Galaxy are derived; however this comparison is not very meaningful because of possible differences in excitation conditions. (Author)

Descriptors :   (*GALAXIES, EXTRATERRESTRIAL RADIO WAVES), (*INTERSTELLAR MATTER, FREE RADICALS), RADIO INTERFEROMETERS, TABLES(DATA), HYDROGEN COMPOUNDS, OXIDES

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE