TY - JOUR

T1 - Extracting angular diameter distance and expansion rate of the universe from two-dimensional galaxy power spectrum at high redshifts

T2 - Baryon acoustic oscillation fitting versus full modeling

AU - Shoji, Masatoshi

AU - Jeong, Donghui

AU - Komatsu, Eiichiro

PY - 2009/3/10

Y1 - 2009/3/10

N2 - 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/H2 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 DA 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.

AB - 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/H2 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 DA 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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U2 - 10.1088/0004-637X/693/2/1404

DO - 10.1088/0004-637X/693/2/1404

M3 - Article

AN - SCOPUS:70350656987

SN - 0004-637X

VL - 693

SP - 1404

EP - 1416

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -