Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-18
Astrophys.J. 590 (2003) 174-180
Astronomy and Astrophysics
Astrophysics
16 pages, 1 figure, accepted for publication in ApJ
Scientific paper
10.1086/374920
We compare X-ray and UV spectroscopic observations of NGC 5548. Both data sets show O VI absorption troughs associated with the AGN outflow from this galaxy. We find that the robust lower limit on the column density of the O VI X-ray trough is seven times larger than the column density found in a study of the O VI UV troughs. This discrepancy suggests that column densities inferred for UV troughs of Seyfert outflows are often severely underestimated. We identify the physical limitations of the UV Gaussian modeling as the probable explanation of the O VI column density discrepancy. Specifically, Gaussian modeling cannot account for a velocity dependent covering fraction, and it is a poor representation for absorption associated with a dynamical outflow. Analysis techniques that use a single covering fraction value for each absorption component suffer from similar limitations. We conclude by suggesting ways to improve the UV analysis.
Arav Nahum
Brinkman Bert
de Kool Martijn
Edelson Rick
Kaastra Jelle
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