Origin of the extragalactic gamma-ray background in the 35-100 MeV range

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/185192· OSTI ID:7068685

Young, E C.M.; Yu, K N

The contributions from quasars with B less than 20 and Seyfert galaxies of types 1 and 1.5 to the diffuse gamma-ray background are investigated. The quasar contribution is found to be 2.06 + 0.71 or - 0.53 x 10 to the -5th photons/sq cm/s/sq sr, which is about 40 percent of the total background. The contribution of the Seyferts is 1.04 + 1.45 or - 0.61 x 10 to the -5th photons/sq cm/s/sr, or about 20 percent of the total. Thus, the extragalactic gamma-ray background in the 35-100 MeV range is probably generated mainly by discrete extragalactic objects. The results also show that quasars and Seyferts contribute significantly to the 1 MeV bump. 34 references.

• Research Organization: City Polytechnic of Hong Kong, Kowloon; Univ. of Hong Kong, Hong Kong
• OSTI ID: 7068685
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 330; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640101* -- Astrophysics & Cosmology-- Cosmic Radiation
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BACKGROUND RADIATION
COSMIC PHOTONS
COSMIC RADIATION
COSMIC RADIO SOURCES
ELEMENTARY PARTICLES
ENERGY RANGE
GALAXIES
IONIZING RADIATIONS
MASSLESS PARTICLES
MEV RANGE
MEV RANGE 10-100
ORIGIN
PHOTONS
QUASARS
RADIATIONS
RED SHIFT
SEYFERT GALAXIES