Quasar Absorption Lines from Radiative Shocks: Implications for Multiphase Outflows and Feedback

Details Quasar Absorption Lines from Radiative Shocks: Implications for Multiphase Outflows and Feedback Quasar Absorption Lines from Radiative Shocks: Implications for Multiphase Outflows and Feedback

2012-01-05

arxiv.org/abs/1201.1286v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 1 figure. Conference proceedings for "AGN Winds in Charleston," Charleston, SC, Oct 15-18, 2011. To be published by A

Scientific paper

Photoionization modeling of certain low-ionization broad absorption lines in quasars implies very compact (Delta R~0.01 pc), galaxy-scale (R kpc) absorbers blueshifted by several 1000 km s^-1. While these are likely signatures of quasar outflows, the lifetimes of such compact absorbers are too short for them to be direct ejecta from a nuclear wind. Instead, I argue that the absorbing clouds must be transient and created in situ. Following arguments detailed by Faucher-Giguere, Quataert, & Murray (2011), I show that a model in which the cool absorbers form in radiative shocks arising when a quasar blast wave impacts an interstellar cloud along the line of sight successfully explains the key observed properties. Using this radiative shock model, the outflow kinetic luminosities for three luminous quasars are estimated to be Edot,k~2-5% L_AGN (with corresponding momentum fluxes Pdot~2-15 L_AGN/c), consistent with feedback models of the M-sigma relation. These energetics are similar to those recently inferred of molecular outflows in local ultra-luminous infrared galaxies and in post-starburt winds, suggesting that active galactic nuclei (AGN) are capable of driving such outflows. Radiative shocks probably affect the multiphase structure of outflows in a range of other systems, including narrower and higher-ionization quasar absorption lines, and compact intergalactic absorbers ejected by star formation and AGN activity.

Affiliated with

Also associated with

No associations

Rating

Quasar Absorption Lines from Radiative Shocks: Implications for Multiphase Outflows and Feedback does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quasar Absorption Lines from Radiative Shocks: Implications for Multiphase Outflows and Feedback, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quasar Absorption Lines from Radiative Shocks: Implications for Multiphase Outflows and Feedback will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-661093