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| Paper: |
Intrinsic UV Absorption and Reddening in Seyfert Galaxies |
| Volume: |
290, Active Galactic Nuclei: from Central Engine to Host Galaxy |
| Page: |
195 |
| Authors: |
Crenshaw, D. M.; Kraemer, S. B. |
| Abstract: |
Recent UV, optical, and X-ray observations of Seyfert 1 galaxies are providing information on the radial locations of the intrinsic absorbers with respect to their nuclei, which is crucial for understanding the origin of this outflowing gas. A correlation between saturated UV absorption lines near systemic velocity, reddening (as measured by UV colors), and inclination of the host galaxy allow the identification of absorbers that originate at large distances (> 100 pc) in the plane of the host galaxy. Fine-structure and metastable UV absorption lines can be used to determine the densities; combined with photoionization models and X-ray constraints, they provide the locations of the inner absorbers (e.g., the high column absorber in NGC 4151 is only ∼0.03 pc from the nucleus). Finally, multi-wavelength monitoring campaigns, such as the recent one on NGC 3783, provide densities and distances of the absorbers from the response of the absorption columns to ionization changes. |
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