Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-04-06
Astrophys.J.734:94,2011
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Accepted by ApJ. 21 pages, 10 figures
Scientific paper
10.1088/0004-637X/734/2/94
The baryon acoustic oscillation (BAO) feature in the clustering of matter in the universe serves as a robust standard ruler and hence can be used to map the expansion history of the universe. We use high force resolution simulations to analyze the effects of galaxy bias on the measurements of the BAO signal. We apply a variety of Halo Occupation Distributions (HODs) and produce biased mass tracers to mimic different galaxy populations. We investigate whether galaxy bias changes the non-linear shifts on the acoustic scale relative to the underlying dark matter distribution presented by Seo et al (2009). For the less biased HOD models (b < 3), we do not detect any shift in the acoustic scale relative to the no-bias case, typically 0.10% \pm 0.10%. However, the most biased HOD models (b > 3) show a shift at moderate significance (0.79% \pm 0.31% for the most extreme case). We test the one-step reconstruction technique introduced by Eisenstein et al. (2007) in the case of realistic galaxy bias and shot noise. The reconstruction scheme increases the correlation between the initial and final (z = 1) density fields achieving an equivalent level of correlation at nearly twice the wavenumber after reconstruction. Reconstruction reduces the shifts and errors on the shifts. We find that after reconstruction the shifts from the galaxy cases and the dark matter case are consistent with each other and with no shift. The 1-sigma systematic errors on the distance measurements inferred from our BAO measurements with various HODs after reconstruction are about 0.07% - 0.15%.
Eckel Jonathan
Eisenstein Daniel J.
Mehta Kushal T.
Metchnik Marc
Pinto Philip
No associations
LandOfFree
Galaxy Bias and its Effects on the Baryon Acoustic Oscillations Measurements does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Galaxy Bias and its Effects on the Baryon Acoustic Oscillations Measurements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galaxy Bias and its Effects on the Baryon Acoustic Oscillations Measurements will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-717530