Constraints on Outflow Properties From Mg II in the Broad Absorption-Line Quasar FBQS J1151+3822

Details Constraints on Outflow Properties From Mg II in the Broad Absorption-Line Quasar FBQS J1151+3822 Constraints on Outflow Properties From Mg II in the Broad Absorption-Line Quasar FBQS J1151+3822

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915432l&link_type=abstract

American Astronomical Society, AAS Meeting #219, #154.32

Astronomy and Astrophysics

Astronomy

Scientific paper

The acceleration mechanism behind quasar outflows is as yet unknown, but constraining the kinetic energy invested in these winds should allow us to discriminate between competing models of their source. To that end, we use new observations of broad absorption-line Mg II in the quasar FBQS J1151+3822 to calculate Mg+ column density in the outflow.
The Mg II apparent optical depth profile bears structural similarities to that of He I*λ10830, suggesting that both lines are produced by the same outflow. Broad Fe II absorption around 2600 Å and blueward reveals that the quasar is an Fe Lo-BAL, and we infer significant iron blending in the high-velocity region of the Mg II line. To account for this blending, we operate under the assumption that the Mg II profile structure approximately mimics that of He I*λ10830, and calculate that Mg+ column density has a lower limit at 1015.0 cm-2.
Leighly et al. (2011) used the He I* lines at 10830 and 3889 Å to place broad constraints on the properties of the absorbing gas. Mg II allows us to significantly tighten these constraints; log ionization parameter is now restricted to between -1.4 and -1.3. We furthermore restrict ourselves to a scenario wherein density is between 107 and 108 cm-3, as justified by Leighly et al. via a dynamical argument and upper limits on Balmer absorption. These preliminary first order approximations constrain kinetic luminosity to between 1044 and 1044.5 ergs/s, absorption-line radius to between 5 and 18 pc, the ratio of kinetic to bolometric luminosity to between 0.2% and 0.6%, mass flux to between 11 and 34 M&sun;/yr, and total hydrogen column density to between 1021.7 and 1021.9 cm-2.
This work is funded by NSF AST-0707703.

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