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arxiv: 1311.1767 · v2 · pith:GUWCVU5Jnew · submitted 2013-11-07 · 🌌 astro-ph.CO

Quasar-Lyman α Forest Cross-Correlation from BOSS DR11 : Baryon Acoustic Oscillations

Andreu Font-Ribera , David Kirkby , Nicolas Busca , Jordi Miralda-Escud\'e , Nicholas P. Ross , An\v{z}e Slosar , Jim Rich , \'Eric Aubourg
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Stephen Bailey Vaishali Bhardwaj Julian Bautista Florian Beutler Dmitry Bizyaev Michael Blomqvist Howard Brewington Jon Brinkmann Joel R. Brownstein Bill Carithers Kyle S. Dawson Timoth\'ee Delubac Garrett Ebelke Daniel J. Eisenstein Jian Ge Karen Kinemuchi Khee-Gan Lee Viktor Malanushenko Elena Malanushenko Moses Marchante Daniel Margala Demitri Muna Adam D. Myers Pasquier Noterdaeme Daniel Oravetz Nathalie Palanque-Delabrouille Isabelle P\^aris Patrick Petitjean Matthew M. Pieri Graziano Rossi Donald P. Schneider Audrey Simmons Matteo Viel Christophe Yeche Donald G. York
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We measure the large-scale cross-correlation of quasars with the Lyman alpha forest absorption, using over 164,000 quasars from Data Release 11 of the SDSS-III Baryon Oscillation Spectroscopic Survey. We extend the previous study of roughly 60,000 quasars from Data Release 9 to larger separations, allowing a measurement of the Baryonic Acoustic Oscillation (BAO) scale along the line of sight $c/(H(z=2.36) ~ r_s) = 9.0 \pm 0.3$ and across the line of sight $D_A(z=2.36) / ~ r_s = 10.8 \pm 0.4$, consistent with CMB and other BAO data. Using the best fit value of the sound horizon from Planck data ($r_s=147.49 Mpc$), we can translate these results to a measurement of the Hubble parameter of $H(z=2.36) = 226 \pm 8 km/s / Mpc$ and of the angular diameter distance of $D_A(z=2.36) = 1590 \pm 60 Mpc$. The measured cross-correlation function and an update of the code to fit the BAO scale (baofit) are made publicly available.

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