Thin disc, Thick Disc and Halo in a Simulated Galaxy

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Jun 4, 2012 - components which can be assigned to a thin stellar disc, thick disk, and a low mass .... makes separation of thick disc and halo stars more diffi- ..... cant bulge during the merger epoch and has an almost pure ..... What we call 'thick disc stars' are those which formed ..... of the Pacific Conference Series, Vol.

Mon. Not. R. Astron. Soc. 000, 1–12 (2011)

Printed 6 June 2012

(MN LATEX style file v2.2)

arXiv:1206.0740v1 [astro-ph.GA] 4 Jun 2012

Thin disc, Thick Disc and Halo in a Simulated Galaxy. C. B. Brook1,2, G. S. Stinson3, B. K. Gibson2,4,5, D. Kawata6, E. L. House2, M. S. Miranda1, A. V. Macci`o2, K. Pilkington2,4,5, R. Roˇskar7, J. Wadsley8, T. R. Quinn9 1 Departamento de F´ısica Te´ orica, Universidad Aut´ onoma de Madrid, E-28049 Cantoblanco, Madrid, Spain Horrocks Institute, University of Central Lancashire, Preston, PR1 2HE, UK 3 Max-Planck-Institut f¨ ur Astronomie, K¨ onigstuhl 17, 69117 Heidelberg, Germany 4 Department of Astronomy & Physics, Saint Mary’s University, Halifax, Nova Scotia, B3H 3C3, Canada 5 Monash Centre for Astrophysics, Monash University, VIC 3800, Australia 6 Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT 7 Institute for Theoretical Physics, University of Z¨ urich, Winterthurerstrasse 190, CH-8057 Z¨ urich, Switzerland 8 Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada 9 Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195-1580, USA 2 Jeremiah

ABSTRACT

Within a cosmological hydrodynamical simulation, we form a disc galaxy with subcomponents which can be assigned to a thin stellar disc, thick disk, and a low mass stellar halo via a chemical decomposition. The thin and thick disc populations so selected are distinct in their ages, kinematics, and metallicities. Thin disc stars are young (