Kinematics from spectral lines for AGN outflows based on time-independent radiation-driven wind theory

Details Kinematics from spectral lines for AGN outflows based on time-independent radiation-driven wind theory Kinematics from spectral lines for AGN outflows based on time-independent radiation-driven wind theory

2011-08-08

arxiv.org/abs/1108.1646v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

38 pages, 14 figures. Accepted for publication in Revista Mexicana de Astronomia y Astrofisica: vol. 47, # 2, October 2011

Scientific paper

We build a bulk velocity-dependent photoionization model of the warm absorber of the Seyfert 1 galaxy NGC 3783. By adopting functional forms for velocity of the flow and its particle density with radius, appropriate for radiation driven winds, we compute the ionization, temperature, line Doppler shift, and line optical depths as a function of distance. By doing this we obtain detailed profiles for the entire absorption line spectrum. The model reproduces the observed relationship between the gas ionization and the velocity shift of the line centroids as well as the asymmetry of the absorption lines in the X-ray spectrum of NGC 3783. It is found that the distribution of asymmetry requires the presence of two outflows: a higher ionization component responsible for the blue wings of the high ionization lines and the red wings of the low ionization oxygen lines, and a lower ionization flow that makes up for the blue wings of the oxygen lines. Our model predicts a relationship between the X-rays and the UV absorbers, where the component creating the long wavelength lines in the X-ray spectrum is also responsible for creating at least part of the UV absorption troughs.

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