Masatoshi Shoji et al. 2009 ApJ 693 1404 doi:10.1088/0004-637X/693/2/1404
Masatoshi Shoji, Donghui Jeong and Eiichiro Komatsu
Show affiliationsWe present a method for extracting the angular diameter distances, DA , and the expansion rates, H, of the universe from the two-dimensional baryon acoustic oscillations (BAO) in the galaxy power spectrum. Our method builds upon the existing algorithm called the "fit-and-extract" (FITEX) method, which allows one to extract only D 2 A /H from a spherically averaged one-dimensional power spectrum. We develop the FITEX-2d method, an extension of the FITEX method, to include the two-dimensional information, which allows us to extract DA and H simultaneously. We test the FITEX-2d method using the Millennium Simulation as well as simplified Monte Carlo simulations with a bigger volume. The BAOs, however, contain only a limited amount of information. We show that the full modeling, including the overall shape of the power spectrum, yields much better determinations of DA and H, hence the dark energy equation of state parameters such as w 0 and wa , than the BAO-only analysis by more than a factor of 2, provided that nonlinear effects are under control.
Issue 2 (2009 March 10)
Received 2008 May 27, accepted for publication 2008 October 20
Published 2009 March 9
Masatoshi Shoji et al. 2009 ApJ 693 1404
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