2014•Journal of Cosmology and Astroparticle PhysicsOpen access
Quasar-Lyman α forest cross-correlation from BOSS DR11: Baryon Acoustic Oscillations
Andreu Font-Ribera, D. Kirkby, Nicolás G. Busca, Jordi Miralda‐Escudé, Nicholas P. Ross, Anže Slosar, James Rich, É. Aubourg, S. Bailey, Vaishali Bhardwaj, Julian Bautista, Florian Beutler, Dmitry Bizyaev, Michael Blomqvist, H. Brewington, J. Brinkmann, Joel R. Brownstein, Bill Carithers, Kyle Dawson, Timothée 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, P. Noterdaeme, Daniel Oravetz, N. Palanque‐Delabrouille, Isabelle Pâris, Patrick Petitjean, Matthew M. Pieri, Graziano Rossi, Donald P. Schneider, Audrey Simmons, Matteo Viel, Christophe Yèche, Donald G. York
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Abstract
We measure the large-scale cross-correlation of quasars with the Lyα 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 sightc/(H(z= 2.36)rs) = 9.0±0.3 and across the line of sightDA(z= 2.36)/rs= 10.8±0.4, consistent with CMB and other BAO data. Using the best fit value of the sound horizon from Planck data (rs= 147.49 Mpc), we can translate these results to a measurement of the Hubble parameter ofH(z= 2.36) = 226±8 km s−1 Mpc−1and of the angular diameter distance ofDA(z= 2.36) = 1590±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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