Physical Conditions Of The QSO Outflow Of SDSS J0838+2955

Details Physical Conditions Of The QSO Outflow Of SDSS J0838+2955 Physical Conditions Of The QSO Outflow Of SDSS J0838+2955

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342212m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #422.12; Bulletin of the American Astronomical Society, Vol. 41, p.242

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a detailed analysis of the 3.5m ARC telescope DIS spectrum of QSO SDSS J0838+2955 at z=2.049. The object shows three broad absorption line (BAL) systems at 22,000, 13,000 and 5,500 km/s blueshifted from the systemic. The highest velocity outflow exhibited a significant variation in C IV and Si IV absorption between the SDSS and ARC epochs, and the lowest velocity system displays absorption from low-ionization species such as Mg II, Al II, Si II, Si II*, Fe II and possibly Fe II*. Accurate column densities were measured for all transitions in the lowest velocity BAL using an inhomogeneous absorber model. The ratio of column densities of Si II* and Fe II* with respect to their ground states gave a density of log n = 3.8+/-0.2 for the outflow. Photoionization modeling with careful regards to the incident SED resulted in an ionization parameter of log U = -2.3+/-0.1 and a hydrogen column density of log N_H = 20.5+/-0.2. This places the outflow at 3400-6500 kpc from the central AGN with a kinetic luminosity of (2.6-8.1)*10^45 ergs/s, which is 0.8-2.6% the bolometric luminosity of the QSO itself. This large distance and kinetic luminosity suggests that QSO outflows can serve as a dominant contributor to AGN feedback mechanisms with their host environment.

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