Extracting the Physical Conditions, Abundances, and Geometric Structure of AGN Outflows from High Resolution UV Spectra: VLT/UVES Observations of the HDFS Target QSO J2233-606

Details Extracting the Physical Conditions, Abundances, and Geometric Structure of AGN Outflows from High Resolution UV Spectra: VLT/UVES Observations of the HDFS Target QSO J2233-606 Extracting the Physical Conditions, Abundances, and Geometric Structure of AGN Outflows from High Resolution UV Spectra: VLT/UVES Observations of the HDFS Target QSO J2233-606

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.1809g&link_type=abstract

American Astronomical Society Meeting 207, #18.09; Bulletin of the American Astronomical Society, Vol. 37, p.1185

Astronomy and Astrophysics

Astronomy

Scientific paper

We present detailed results on the physical conditions, geometric structure, and chemical abundances in the AGN outflow systems (vout ˜ -5000 - -3800 km s-1) detected in the central HDFS quasar, QSO J2233-606, based on analysis of a high S/N VLT/UVES spectrum. We globally fit all intrinsic UV absorption lines detected in the VLT spectrum to extract velocity-dependent covering factors and optical depths from the observed absorption troughs. This gives the required constraints to treat the complex geometric coverage of the background AGN emission sources and reveals: (1) narrow kinematic substructure in the column density profiles, indicating the relatively broad absorption is comprised of a series of narrower components; (2) the continuum source is fully (or nearly so) occulted by the absorbers at all velocities, while the BLR emission exhibits systematically smaller coverage fraction ( ˜0 - 60% ); and (3) an increase in covering factor in higher velocity components. We employ velocity-dependent photoionization modeling, which allows a full quantitative solution to the C, N, and O abundances, as well as the velocity resolved ionization parameter and total outflow column density. The outflow systems have supersolar abundances, with [C/H] and [O/H] ˜0.5 -- 0.6, and [N/H] ˜ 1.2, consistent with the Z2 scaling expected from secondary nucleosynthesis processes; independent fits to each component give consistent results. We explore the implications of these results for the kinematic-geometric-ionization structure and evolution of the outflow.

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