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| Paper: |
Discovery of Strongly Blue Shifted Mid-infrared [Ne III ] and [Ne V] Emission in ULIRGs |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
80 |
| Authors: |
Spoon, H. W. W.; Holt, J. |
| Abstract: |
We report the discovery of blue shifted (Δv>200 km s-1)
mid-infrared [Ne III] and/or [Ne V] emission in 25
out of 82 ULIRGs (30% of our sample). The incidence of blue shifted
[Ne V] emission is even higher (59%) among the sources
with a [Ne V] detection — the tell-tale signature of
an active galactic nucleus (AGN).
Sixteen ULIRGs in our sample, eleven of which are optically
classified as AGN, have [Ne III] blue shifts above
200 km s-1. A comparison of the liNe profiles of their
12.81 μm [Ne II], 15.56 μm [Ne III] and
14.32 μm [Ne V] lines reveals the ionization of
the blue shifted gas to increase with blue shift, implying
decelerating outflows in a stratified medium, photo-ionized
by the AGN.
The strong correlation of the liNe width of the [Ne III]
liNe with the radio luminosity indicates that interaction of
expanding radio jets with the dense ISM surrounding the AGN
may explain the observed neon liNe kinematics for the strongest
radio sources in this sample. |
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