An interpretation of the low energy gamma ray emission from Seyfert nuclei in terms of annihilation radiation from a hot plasma

Details An interpretation of the low energy gamma ray emission from Seyfert nuclei in terms of annihilation radiation from a hot plasma An interpretation of the low energy gamma ray emission from Seyfert nuclei in terms of annihilation radiation from a hot plasma

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122...83b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 83-87.

Astronomy and Astrophysics

Astronomy

6

Galactic Nuclei, Gamma Ray Astronomy, Plasma Radiation, Positron Annihilation, Seyfert Galaxies, Black Holes (Astronomy), Energy Spectra, High Temperature Plasmas, Line Spectra, X Ray Spectra

Scientific paper

Recent γ-ray observations of two Seyfert galaxies are interpreted in terms of electron-positron pair annihilation radiation. A simplified scenario is envisaged in which a massive black hole is acereting material from a marginally thick disk characterized by a hot (T ≳ 109 K) e± plasma. At these very high temperatures the 511 keV line emission loses its characteristic features to become both broadened and blueshifted. Observational X- and γ-ray data are used to investigate the possibility that the "bump" in the spectral emission at photon energies close to one MeV observed in two Seyfert galaxies may be due to this annihilation feature. In particular the selfconsistency of the parameters estimated from the γ-ray data is explored. The effects of the competing cooling processes (Synchrotron, Compton, Bremsstrahlung) are evaluated in order to optimize the plasma conditions required for the emission of intense et annihilation radiation. It is possible that such hot and marginally thick plasma are in pair equilibrium, but unstable for example to isothermal perturbations of the pair density - proton density ratio. Therefore the observed variability of the γ-ray emission may well be related to the plasma changing conditions.

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