期刊
ASTROPHYSICAL JOURNAL
卷 693, 期 2, 页码 1404-1416出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/693/2/1404
关键词
cosmology: theory; large-scale structure of universe
资金
- Texas Advanced Research Program [003658-0005-2006]
- NASA [NNX08AM29G, NNX08AL43G]
- NSF [AST-0807649]
- Alfred P. Sloan Research Fellowship
- NASA [NNX08AM29G, 98407] Funding Source: Federal RePORTER
We present a method for extracting the angular diameter distances, D-A, 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-A(2)/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 D-A 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 D-A and H, hence the dark energy equation of state parameters such as w(0) and w(a), than the BAO-only analysis by more than a factor of 2, provided that nonlinear effects are under control.
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