English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We develop a formalism for measuring the cosmological distance scale frombaryon acoustic oscillations (BAO) using the cross-correlation of a sparseredshift survey with a denser photometric sample. This reduces the shot noisethat would otherwise affect the auto-correlation of the sparse spectroscopicmap. As a proof of principle, we make the first on-sky application of thismethod to a sparse sample defined as the z>0.6 tail of the Sloan Digital SkySurvey's (SDSS) BOSS/CMASS sample of galaxies and a dense photometric samplefrom SDSS DR9. We find a 2.8sigma preference for the BAO peak in thecross-correlation at an effective z=0.64, from which we measure the angulardiameter 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 higherprecision BAO measurements than possible with the spectroscopy alone.

Analyzing Baryon Acoustic Oscillations in Sparse Spectroscopic Samples via Cross-Correlation with Dense Photometry