University of Hertfordshire

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From the same journal

By the same authors

Jet-induced star formation in gas-rich galaxies

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Original languageEnglish
Number of pages12
Pages (from-to)438-449
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date1 Sep 2012
Volume425
Issue1
DOIs
Publication statusPublished - 1 Sep 2012

Abstract

Feedback from active galactic nuclei (AGN) has become a major component in simulations of
galaxy evolution, in particular for massive galaxies. AGN jets have been shown to provide a
large amount of energy and are capable of quenching cooling flows. Their impact on the host
galaxy, however, is still not understood. Subgrid models of AGN activity in a galaxy evolution
context so far have been mostly focused on the quenching of star formation. To shed more light
on the actual physics of the ‘radio mode’ part of AGN activity, we have performed simulations
of the interaction of a powerful AGN jet with the massive gaseous disc (1011 M) of a
high-redshift galaxy. We spatially resolve both the jet and the clumpy, multi-phase interstellar
medium (ISM) and include an explicit star formation model in the simulation. Following the
system over more than 107 yr, we find that the jet activity excavates the central region, but
overall causes a significant change to the shape of the density probability distribution function
and hence the star formation rate due to the formation of a blast wave with strong compression
and cooling in the ISM. This results in a ring- or disc-shaped population of young stars. At later
times, the increase in star formation rate also occurs in the disc regions further out since the
jet cocoon pressurizes the ISM. The total mass of the additionally formed stars may be up to
1010 M for one duty cycle. We discuss the details of this jet-induced star formation (positive
feedback) and its potential consequences for galaxy evolution and observable signatures.

Notes

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2012 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. The version of record is available online at doi:10.1111/j.1365-2966.2012.21479.x.

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