Analysing baryon acoustic oscillations in sparse spectroscopic samples via cross-correlation with dense photometry
AffiliationUniv Arizona, Steward Observ
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PublisherOXFORD UNIV PRESS
CitationA Patej, D J Eisenstein; Analysing baryon acoustic oscillations in sparse spectroscopic samples via cross-correlation with dense photometry, Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 4, 11 July 2018, Pages 5090–5103, https://doi.org/10.1093/mnras/sty870
Rights© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
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AbstractWe develop a formalism for measuring the cosmological distance scale from baryon acoustic oscillations (BAO) using the cross-correlation of a sparse redshift survey with a denser photometric sample. This reduces the shot noise that would otherwise affect the autocorrelation of the sparse spectroscopic map. As a proof of principle, we make the first on-sky application of this method to a sparse sample defined as the z > 0.6 tail of the Sloan Digital Sky Survey's (SDSS) BOSS/CMASS sample of galaxies and a dense photometric sample from SDSS DR9. We find a 2.8 sigma preference for the BAO peak in the cross-correlation at an effective z = 0.64, from which we measure the angular diameter distance D-M(z = 0.64) = (2418 +/- 73 Mpc)(r(s)/r(s, fid)). Accordingly, we expect that using this method to combine sparse spectroscopy with the deep, high-quality imaging that is just now becoming available will enable higher precision BAO measurements than possible with the spectroscopy alone.
VersionFinal published version
SponsorsNASA Einstein Fellowship program [PF6-170157]; Simons Foundation; U.S. Department of Energy [DE-SC0013718]; Alfred P. Sloan Foundation; National Science Foundation; U.S. Department of Energy Office of Science; University of Arizona; Brazilian Participation Group; Brookhaven National Laboratory; Carnegie Mellon University; University of Florida; Harvard University; Instituto de Astrofisica de Canarias; Michigan State/Notre Dame/JINA Participation Group; Johns Hopkins University; Lawrence Berkeley National Laboratory; Max Planck Institute for Astrophysics; Max Planck Institute for Extraterrestrial Physics; New Mexico State University; New York University; Ohio State University; Pennsylvania State University; University of Portsmouth; Princeton University; University of Tokyo; University of Utah; Vanderbilt University; University of Virginia; University of Washington; Yale University