Spallation of Iron in Black Hole Accretion Flows
Author(s) -
J. G. Skibo
Publication year - 1997
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/303829
Subject(s) - physics , astrophysics , active galactic nucleus , cosmic ray , galaxy , spallation , accretion (finance) , gamma ray , spectral line , emission spectrum , line (geometry) , astronomy , nuclear physics , neutron , geometry , mathematics
In the local Galactic interstellar medium there is approximate energyequipartition between cosmic rays, magnetic fields and radiation. If this holdsin the central regions of AGN, in particular Seyfert galaxies, then consideralnuclear spallation of Fe occurs, resulting in enhanced abundances of the sub-Feelements Ti, V, Cr and Mn. These elements produce a cluster of X-rayflourescence lines at energies just below the 6.4 keV Fe-K$\alpha$ line. It issuggested that the red wings on the Fe lines observed with ASCA from variousSeyfert AGN are due to the unresolved line emission from these elements. Futureobservations with more sensitive X-ray instruments should resolve these lines.The estimated gamma ray emission from nuclear deexcitation and neutral pionproduction is calculated and found to be below the sensitivities of any currentinstruments. However, very luminous nearby Seyferts displaying Fe lines withred wings would have $>100$ MeV continuum emission detectable by futureinstruments such as GLAST.Comment: 11 pages, Latex, requires AASTEX macros, 5 postscript figures, Astrophysical Journal in pres
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