ar X iv : a st ro - p h / 06 11 57 8 v 1 1 7 N ov 2 00 6 The weak absorbing outflow in AGN Mrk 279 : evidence of super - solar metal abundances
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چکیده
We present analysis and photoionization modeling of the Chandra high resolution spectrum of Mrk 279. There is clear evidence of an absorbing outflow which is best fit by a two component model, one with a low ionization parameter and one with a higher ionization parameter. The column density of the X-ray warm absorber, about logNH = 20, is the smallest known of all AGNs in which X-ray absorbing outflows are observed. We find that the X-ray and UV/FUV absorbers are part of the same overall outflow. There is some evidence of supersolar carbon, nitrogen, oxygen and iron in the Chandra spectrum of Mrk 279. While this is not a robust result in itself, Chandra data in combination with the UV data and the pressure equilibrium between two phases of the outflow, support the scenario of super-solar abundances. This the first case where super-solar abundances are reported in the nucleus of a normal Seyfert galaxy. Subject headings: galaxies:Seyfert — quasars:individual(Mrk 279) — quasars:absorption lines — galaxies:abundances — x-ray:galaxies
منابع مشابه
Comments on the manuscript : “ The weak absorbing outflow in AGN Mrk 279 : evidence of super - solar metal abundances ” astro - ph / 0611578 by Fields
A recent manuscript posted on astro-ph (0611578) by Fields et al. (hereafter F06) reports evidence of supersolar metal abundances in Mrk 279 by analyzing its Chandra LETGS X-ray spectrum. We point out that it is impossible in principle to obtain direct metal abundances from these X-ray data, since there is no handle on the amount of hydrogen column density. If F06 would have lowered their C, N,...
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تاریخ انتشار 2006