Gamma-ray observations of Seyfert galaxies and the problem of the extragactic gamma-ray background

Conference · Tue Jan 01 04:00:00 EST 1980 · Ann. N.Y. Acad. Sci.; (United States)

OSTI ID:5044930

Schoenfelder, V

Observations of the gamma-ray (GR) emission from Seyfert galaxies and the origin of the diffuse cosmic GR component are critically reviewed. A comparison of observations of NGC 4151 at X-ray energies and at GR energies is presented. In addition, synchrotron self-Compton models are discussed as a possible explanation for the cutoff in the GR spectrum. The origin of the diffuse cosmic GR component is investigated as the possible result of various processes, including quantum-mechanical decay of small black holes and matter-antimatter annihilation in a baryon symmetric universe. Also discussed is continuum GR emission from our own galaxy, from the quasar 3C273 and from the Seyfert galaxy NGC 4151.

• Research Organization: Max-Planck-Institut fuer Physik und Astrophysik, Munich, West Germany
• OSTI ID: 5044930
• Report Number(s): CONF-781245-
• Conference Information: Journal Name: Ann. N.Y. Acad. Sci.; (United States) Journal Volume: 336
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTRONOMY
BACKGROUND RADIATION
BARYONS
BLACK HOLES
COSMIC RADIO SOURCES
ELEMENTARY PARTICLES
FERMIONS
GALAXIES
GAMMA ASTRONOMY
GAMMA SPECTROSCOPY
HADRONS
MILKY WAY
QUASARS
RADIATIONS
SEYFERT GALAXIES
SPECTROSCOPY