Cosmic distance determination from photometric redshift samples using BAO peaks only
Abstract
The galaxy distributions along the line of sight are significantly contaminated by the uncertainty on redshift measurements obtained through multiband photometry, which makes it difficult to get cosmic distance information measured from baryon acoustic oscillations, or growth functions probed by redshift distortions. We investigate the propagation of the uncertainties into largescale clustering by exploiting all known estimators, and propose the wedge approach as a promising analysis tool to extract cosmic distance information still remaining in the photometric galaxy samples. We test our method using simulated galaxy maps with photometric uncertainties of σ_{0} = (0.01, 0.02, 0.03). The measured anisotropy correlation function ξ is binned into the radial direction of s and the angular direction of μ, and the variations of ξ (s,μ) with perpendicular and radial cosmic distance measures of D_{A} and H^{1} are theoretically estimated by an improved RSD model. Although the radial cosmic distance H^{1} is unable to be probed from any of the three photometric galaxy samples, the perpendicular component of D_{A} is verified to be accurately measured even after the full marginalization of H^{1}. We measure D_{A} with approximately 6 per cent precision which is nearly equivalent to what we can expect from spectroscopic DR12 CMASS galaxy samples.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 September 2019
 DOI:
 10.1093/mnras/stz1716
 arXiv:
 arXiv:1903.09651
 Bibcode:
 2019MNRAS.488..295S
 Keywords:

 cosmological parameters;
 largescale structure of Universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 11 pages, 8 figures, MNRAS published New Figure 8 with constraints expected from upcoming surveys (LSST, Euclid)