G22A002

Radio-AGN feedback: an extension to lower power sources

Abstract

The active galactic nuclei (AGN) are believed to starve the host galaxy of the fuel needed to
form stars. Numerical simulations suggest that radio jets can couple strongly with the
interstellar medium (ISM) and deposit jet-driven momentum into cold gas, providing negative
feedback. This impact is believed to depend on the radio power, and distribution and
morphology of the ambient gas. To test these predictions and quantify radio AGN feedback,
cold gas in the nuclear region of radio galaxies should be studied at high spatial resolution
and over a range of radio powers. We propose to carry out this study via HI absorption for
five radio sources whose low spatial resolution HI absorption spectra show the presence of
disturbed gas, most likely in the nuclear region. Our sources have 1.4GHz radio power <
10^{24.5} W/Hz, lower than most of the sources studied for jet-ISM interaction. This will be an
extension of our earlier studies of powerful radio sources to lower power sources that
dominate the radio AGN population. With the proposed observations we will test the
predictions of models of jet-ISM interaction and provide inputs on energetics, time and spatial
scales involved.

Investigators

Name	Institution
Zsolt Paragi	Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium
Tom Oosterloo	Netherlands Institute for Radio Astronomy
Rafaella Morganti	Netherlands Institute for Radio Astronomy
Suma Murthy *	Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium
GBT Operator	Green Bank Observatory

* indicates the PI