THE MID-LIFE CRISIS OF THE MILKY WAY AND M31
Simon J Mutch, Darren J Croton, Gregory B Poole
Astrophysical Journal | IOP PUBLISHING LTD | Published : 2011
S. M. is supported by a Swinburne University SUPRA postgraduate scholarship. D. C. acknowledges receipt of a QEII Fellowship awarded by the Australian government. G. P. is supported by the ARC DP program. The authors would like to thank S. Bamford and the Galaxy Zoo team for kindly supplying the observational data used in this work. The visual classification of the Galaxy Zoo galaxies was made by more than 100,000 volunteers. Their contributions are acknowledged at http://www.galaxyzoo.org/Volunteers.aspx. The authors also thank C. Flynn, L. Spitler, and the anonymous referee for their extremely helpful comments and suggestions. The Millennium Simulation used in this paper was carried out by the Virgo Supercomputing Consortium at the Computing Centre of the Max-Planck Society. Semi-analytic galaxy catalogs from the simulation are publicly available at http://www.mpa-garching.mpg.de/millennium/.