Constraining the baryon–dark matter relative velocity with the large-scale three-point correlation function of the SDSS BOSS DR12 CMASS galaxies

Zachary Slepian, Daniel J. Eisenstein, Jonathan A. Blazek, Joel R. Brownstein, Chia-Hsun Chuang, Héctor Gil-marín, Shirley Ho, Francisco-shu Kitaura, Joseph E. Mcewen, Will J. Percival, Ashley J. Ross, Graziano Rossi, Hee-Jong Seo, Anže Slosar, Mariana Vargas-Magaña

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Abstract

We search for a galaxy clustering bias due to a modulation of galaxy number with the baryon–dark matter relative velocity resulting from recombination-era physics. We find no detected signal and place the constraint bv < 0.01 on the relative velocity bias for the CMASS galaxies. This bias is an important potential systematic of baryon acoustic oscillation (BAO) method measurements of the cosmic distance scale using the two-point clustering. Our limit on the relative velocity bias indicates a systematic shift of no more than 0.3 per cent rms in the distance scale inferred from the BAO feature in the BOSS two-point clustering, well below the 1 per cent statistical error of this measurement. This constraint is the most stringent currently available and has important implications for the ability of upcoming large-scale structure surveys such as the Dark Energy Spectroscopic Instrument (DESI) to self-protect against the relative velocity as a possible systematic.
Original languageEnglish
Pages (from-to)2109-2115
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number2
Early online date24 Oct 2017
DOIs
Publication statusPublished - 21 Feb 2018

Keywords

  • RCUK
  • STFC
  • ST/M001709/1
  • ST/N000668/1
  • ST/N00180X/1
  • cosmological parameters
  • cosmology: observations

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