Title :
Extragalactic 21-CM Line Studies
Author :
Heeschen, D.S. ; Dieter, N.H.
Author_Institution :
Natl. Radio Astronomical Observatory, Green Bank, W. Va.
Abstract :
The study of neutral hydrogen in extragalactic systems by means of its 21-centimeter line emission is a relatively new field of radio astronomy research. To date, radiation has been observed from seven galaxies and three clusters of galaxies. In this paper some of the results of these observations are described. Although the observational material presently available is quite limited, it does indicate the great potential power of extragalactic 21-centimeter line studies.
Keywords :
Arm; Electromagnetic wave absorption; Helium; Hydrogen; Observatories; Optical receivers; Optical sensors; Radio astronomy; Receiving antennas; Spirals;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1958.286740
