Robichaud, F;
Williamson, D;
Martel, H;
Kawata, D;
Ellison, SL;
(2017)
Star Formation History in Barred Spiral Galaxies. AGN Feedback.
Monthly Notices of the Royal Astronomical Society
, 469
(3)
pp. 3722-3737.
10.1093/mnras/stx1121.
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Abstract
We present a numerical study of the impact of AGN accretion and feedback on the star formation history of barred disc galaxies. Our goal is to determine whether the effect of feedback is positive (enhanced star formation) or negative (quenched star formation), and to what extent. We performed a series of 12 hydrodynamical simulations of disc galaxies, 10 barred and 2 unbarred, with various initial gas fractions and AGN feedback prescriptions. In barred galaxies, gas is driven toward the centre of the galaxy and causes a starburst, followed by a slow decay, while in unbarred galaxies the SFR increases slowly and steadily. AGN feedback suppresses star formation near the central black hole. Gas is pushed away from the black hole, and collides head-on with inflowing gas, forming a dense ring at a finite radius where star formation is enhanced. We conclude that both negative and positive feedback are present, and these effects mostly cancel out. There is no net quenching or enhancement in star formation, but rather a displacement of the star formation sites to larger radii. In unbarred galaxies, where the density of the central gas is lower, quenching of star formation near the black hole is more efficient, and enhancement of star formation at larger radii is less efficient. As a result, negative feedback dominates. Lowering the gas fraction reduces the star formation rate at all radii, whether or not there is a bar or an AGN.
Type: | Article |
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Title: | Star Formation History in Barred Spiral Galaxies. AGN Feedback |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/stx1121 |
Publisher version: | http://dx.doi.org/10.1093/mnras/stx1121 |
Language: | English |
Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Galaxies: stars: formation – galaxies: active, galaxies: evolution, galaxies: spiral, galaxies: starburst |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
URI: | https://discovery.ucl.ac.uk/id/eprint/1556190 |
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