[1] Swinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia
[2] Queensland Univ Technol, Sci & Engn Fac, Sch Chem & Phys, Gardens Point Campus, Brisbane, Qld 4001, Australia
[3] San Jose State Univ, Dept Phys & Astron, One Washington Sq, San Jose, CA 95192 USA
[4] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA