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Bursty star formation feedback and cooling outflows

Suarez, T; Pontzen, A; Peiris, HV; Slyz, A; Devriendt, J; (2016) Bursty star formation feedback and cooling outflows. Monthly Notices of the Royal Astronomical Society , 462 (1) pp. 994-1001. 10.1093/mnras/stw1670. Green open access

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Abstract

We study how outflows of gas launched from a central galaxy undergoing repeated starbursts propagate through the circum-galactic medium (CGM), using the simulation code RAMSES. We assume that the outflow from the disc can be modelled as a rapidly moving bubble of hot gas at ∼1 kpc above disc, then ask what happens as it moves out further into the halo around the galaxy on ∼100 kpc scales. To do this, we run 60 two-dimensional simulations scanning over parameters of the outflow. Each of these is repeated with and without radiative cooling, assuming a primordial gas composition to give a lower bound on the importance of cooling. In a large fraction of radiative-cooling cases we are able to form rapidly outflowing cool gas from in situ cooling of the flow. We show that the amount of cool gas formed depends strongly on the ‘burstiness’ of energy injection; sharper, stronger bursts typically lead to a larger fraction of cool gas forming in the outflow. The abundance ratio of ions in the CGM may therefore change in response to the detailed historical pattern of star formation. For instance, outflows generated by star formation with short, intense bursts contain up to 60 per cent of their gas mass at temperatures <5 × 104 K; for near-continuous star formation, the figure is ≲5 per cent. Further study of cosmological simulations, and of idealized simulations with e.g. metal-cooling, magnetic fields and/or thermal conduction, will help to understand the precise signature of bursty outflows on observed ion abundances.

Type: Article
Title: Bursty star formation feedback and cooling outflows
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stw1670
Publisher version: http://dx.doi.org/10.1093/mnras/stw1670
Language: English
Additional information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, hydrodynamics, galaxies: haloes, intergalactic medium, COLD DARK-MATTER, COS-HALOS SURVEY, DWARF GALAXIES, SUPERNOVA FEEDBACK, GALACTIC OUTFLOWS, CIRCUMGALACTIC MEDIUM, STELLAR FEEDBACK, MASS GALAXIES, WINDS, ORIGIN
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 Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1508385
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