Accession Number : AD0711299

Title :   NEUTRAL HYDROGEN ABSORPTION IN THE Irr II GALAXY M82,

Corporate Author : CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY

Personal Author(s) : Guelin,M. ; Weliachew,L.

Report Date : 1970

Pagination or Media Count : 20

Abstract : Absorption by neutral hydrogen has been detected in the galaxy M82. Measurements were carried out with the transit radio telescope at Nancay. Emission and absorption do not occur at the same velocities. The velocity and width of the absorption profile are i agreement with emission lines detected previously at optical wavelengths along the major axis and close to the center of the galaxy. The neutral absorbing gas is related to the non-circular motions near the center of the galaxy rather than to the rotation as derived from optical absorption lines. The neutral hydrogen temperature cannot be estimated because emission was not detected at the central absorption velocity. (Author)

Descriptors :   (*GALAXIES, MICROWAVE SPECTROSCOPY), (*INTERSTELLAR MATTER, HYDROGEN), (*EXTRATERRESTRIAL RADIO WAVES, ABSORPTION), RADIO TELESCOPES, TEMPERATURE

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE