A Survey of 23 Localized Radio Sources in the Northern Hemisphere

Abstract

A survey has been made of the radio emission from a limited region of the Northern Hemisphere using a pencil beam 2° wide at a wave-length of 1.89 m. The coordinates and intensities of 23 localized sources have been measured. Their distribution shows a marked concentration of the intense sources around the galactic plane. The distribution of the weaker sources cannot be inferred from the survey, but from the results of other surveys it is believed that their distribution is more nearly isotropic. It is concluded that the intense sources represent a class of rare objects in the Galaxy which lie close to the galactic plane. The data at present available are not sufficient to decide whether the weak sources also lie inside the Galaxy; however, there is some evidence to show that a number of these sources are extra-galactic.