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The Narrow Line Region in 3D: mapping AGN feeding and feedback

Published online by Cambridge University Press:  09 February 2015

Thaisa Storchi Bergmann
Thaisa Storchi Bergmann*
Affiliation:
Instituto de Física, UFRGS, Campus do Vale, Porto Alegre, RS, Brazil Visitor Professor at the Harvard-Smithsonian Center for Astrophysics, email: [email protected]
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Abstract

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Early studies of nearby Seyfert galaxies have led to the picture that the Narrow Line Region is a cone-shaped region of gas ionized by radiation from a nuclear source collimated by a dusty torus, where the gas is in outflow. In this contribution, I discuss a 3D view of the NLR obtained via Integral Field Spectroscopy, showing that: (1) although the region of highest emission is elongated (and in some cases cone-shaped), there is also lower level emission beyond the “ionization cone”, indicating that the AGN radiation leaks through the torus; (2) besides outflows, the gas kinematics include also rotation in the galaxy plane and inflows; (3) in many cases the outflows are compact and restricted to the inner few 100pc; we argue that these may be early stages of an outflow that will evolve to an open-ended, cone-like one. Inflows are observed in ionized gas in LINERs, and in warm molecular gas in more luminous AGN, being usually found on hundred of pc scales. Mass outflow rates in ionized gas are of the order of a few M⊙ yr−1, while the mass inflow rates are of the order of tenths of M⊙ yr−1. Mass inflow rates in warm molecular gas are ≈ 4–5 orders of magnitude lower, but these inflows seem to be only tracers of more massive inflows in cold molecular gas that should be observable at mm wavelengths.

Keywords

galaxies - activegalaxies - nucleigalaxies - kinematicsgalaxies - ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 190 - 195
Copyright
Copyright © International Astronomical Union 2015 

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