Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0823t&link_type=abstract
American Astronomical Society, HEAD meeting #11, #8.23; Bulletin of the American Astronomical Society, Vol. 41, p.666
Other
Scientific paper
Suzaku data from NGC 4051 reveals line emission at 5.44 keV that is conclusively shown to be inconsistent with being a statistical fluctuation in the data. The time-sliced data show the line to have a constant flux and energy on tens of ks and over years, consequently the line is most prominent when the continuum flux is low. The stability of line flux and energy disfavors an origin from a disk hot-spot, as has been suggested for similar lines in other sources. The line may be identified as Cr I Ka emission and the high strength explained by spallation of Fe into Cr by low-energy cosmic rays from the active nucleus. We find that the highest abundance enhancements are likely to take place in gas out of the plane of the accretion disk and that timescales for spallation could be as short as a few years. The suggestion of a strong nuclear flux of cosmic rays in a radio-quiet active Seyfert galaxy is of particular interest in light of the recent suggestion from Pierre Auger Observatory data that ultra-high-energy cosmic rays may originate in such sources.
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