Physics
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.a1212s&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #A12.12
Physics
Scientific paper
ASCA observations of various Seyfert AGN have revealed 6.4 keV Fe-Kα line profiles displaying red wings. This has been interpreted as emission from the inner regions of an accretion disk of a massive black hole, where the asymmetric line profile is attributed to Doppler and gravitational effects. An alternative mechanism is proposed in which the Fe-line red wings are due to unresolved Kα line emission from the sub-Fe elements Ti, V, Cr and Mn. In normal cosmic abundance these elements are not expected to contribute significant X-ray line emission. However, if there is approximate energy equipartition between cosmic-rays, magnetic fields and radiation in the atmosphere of the central black hole, a condition which holds in the local interstellar medium, then consideral nuclear spallation of Fe occurs, resulting in enhanced abundances of sub-Fe elements. The energetic protons produce gamma-ray emission in the form of nuclear deexcitation lines, π^0 decay and bremsstrahlung of π^± decay electrons and positrons. The prospects for detecting this emission from AGN as well as galactic black holes is discussed.
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