Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-17
Astrophys.J.666:828-834,2007
Astronomy and Astrophysics
Astrophysics
19 pages, 5 figures. Replaced with the version accepted for publication in the ApJ
Scientific paper
10.1086/520322
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 log N_H=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 super-solar 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. The data suggest that the outflow originates from a compact region around the nuclear black hole and that it carries insignificant amount of mass and energy.
Fields Dale L.
Krongold Yair
Mathur Smita
Nicastro Fabrizio
Williams Rik
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