Photoerosion of nuclei in quasar emission-line regions

Details Photoerosion of nuclei in quasar emission-line regions Photoerosion of nuclei in quasar emission-line regions

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..21b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 1, 1987, p. L21-L24.

Statistics

Computation

13

Abundance, Emission Spectra, Galactic Nuclei, Gamma Rays, Quasars, Radiation Effects, Active Galactic Nuclei, Computational Astrophysics, Line Spectra, Mass Distribution, Plasma-Electromagnetic Interaction, Seyfert Galaxies

Scientific paper

Several active galactic nuclei are now known to be sources of hν ≥ MeV γ-rays. The authors point out some consequences of this radiation for elemental abundances in nearby emission-line regions. A series of (γ,n) and (γ,p) reactions result in mass degradation, a process the authors refer to as photoerosion. Heavy nuclei such as Fe and Ni are destroyed on time scales of roughly 103yr for regions in NGC 4151, while most light nuclear abundances change little on such time scales. Many odd-z nuclei, particularly B, have large abundance increases. Photoerosion may account for several previously unexplained phenomena, e.g., the large spectral differences between radio-loud and radio-quiet AGN and the observed aluminum overabundance.

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