Le Bret, T;
Pontzen, A;
Cooper, AP;
Frenk, C;
Zolotov, A;
Brooks, AM;
Governato, F;
(2017)
Particle tagging and its implications for stellar population dynamics.
Monthly Notices of the Royal Astronomical Society
, 468
(3)
pp. 3212-3222.
10.1093/mnras/stx552.
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Abstract
We establish a controlled comparison between the properties of galactic stellar haloes obtained with hydrodynamical simulations and with ‘particle tagging’. Tagging is a fast way to obtain stellar population dynamics: instead of tracking gas and star formation, it ‘paints’ stars directly on to a suitably defined subset of dark matter particles in a collisionless, dark-matter-only simulation. Our study shows that ‘live’ particle tagging schemes, where stellar masses are painted on to the dark matter particles dynamically throughout the simulation, can generate good fits to the hydrodynamical stellar density profiles of a central Milky Way-like galaxy and its most prominent substructure. Energy diffusion processes are crucial to reshaping the distribution of stars in infalling spheroidal systems and hence the final stellar halo. We conclude that the success of any particular tagging scheme hinges on this diffusion being taken into account, and discuss the role of different subgrid feedback prescriptions in driving this diffusion.
| Type: | Article |
|---|---|
| Title: | Particle tagging and its implications for stellar population dynamics |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx552 |
| Publisher version: | http://doi.org/10.1093/mnras/stx552 |
| Language: | English |
| Additional information: | © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, methods: numerical, galaxies: formation, galaxies: haloes, galaxies: structure, HIERARCHICAL GALAXY FORMATION, COLD DARK-MATTER, MILKY-WAY, COSMOLOGICAL SIMULATIONS, SATELLITE GALAXIES, FORMATION HISTORY, GALACTIC HALOES, BARYONS MATTER, DUAL ORIGIN, CDM MODEL |
| 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/1512788 |
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