High-energy gamma-ray sources observed by COS-B

COS-B has now detected 29 localized sources of high-energy (greater than 100 MeV) gamma rays. An attempt has been made to eliminate selection effects from the study of their distribution in the sky, by excluding those whose intensities are below the threshold for detection in the brightest part of the Galaxy. The 18 sources left show, in addition to their concentration near the Galactic equator, a marked concentration in the first and fourth quadrants of longitude. The energy spectra of four of the sources, in the range 100 MeV to 3 GeV, have been derived and are shown to be markedly dissimilar.