Accession Number:

AD0711300

Title:

GALACTIC HYDROGEN ABSORPTION AT 21 CM WAVELENGTH IN THE DIRECTION OF VIRGO A,

Descriptive Note:

Corporate Author:

CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY

Personal Author(s):

• Colvin,R. S.
• Hughes,M. P.
• Thompson,A. R.
• Verschuur,G. L.

Report Date:

1970-01-01

Pagination or Media Count:

18.0

Abstract:

The 21 cm optical depth in the direction of Virgo A is 0.017 plus or minus 0.003 near the velocity of the peak of the galactic background emission, and the corresponding gas temperature lies within the range 180 - 460 degrees Kelvin. In the negative-velocity wing of the emission profile the optical depth is less than 0.002 which indicates a minimum gas temperature of 600K.

Descriptors:

• (*GALAXIES
• MICROWAVE SPECTROSCOPY)
• (*INTERSTELLAR MATTER
• HYDROGEN)
• (*EXTRATERRESTRIAL RADIO WAVES
• ABSORPTION)
• LINE SPECTRA
• INTEGRATORS
• STARS
• RADIO TELESCOPES
• INTERFEROMETERS
• ANTENNAS

Subject Categories:

• Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE