Quasar-Lyman α forest cross-correlation from BOSS DR11: Baryon Acoustic Oscillations

Quasar-Lyman α forest cross-correlation from BOSS DR11: Baryon Acoustic Oscillations

We measure the large-scale cross-correlation of quasars with the Ly 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, allo...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2014-05, Vol.2014 (5), p.i-23
Main Authors: Font-Ribera, Andreu, Kirkby, Busca, Nicolas, Miralda-Escude, Jordi, Ross, Nicholas P, Slosar, Rich, James, Aubourg, Eric, Bailey, Stephen, Bhardwaj, Vaishali
Format: Article
Language:eng
Subjects:
ABSORPTION
Acoustic surveying
Acoustics
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BARYONS
CORRELATION FUNCTIONS
CORRELATIONS
Cosmology
Cosmology and Extra-Galactic Astrophysics
DATA
DISTANCE
Forests
Line of sight
OSCILLATIONS
Physics
QUASARS
Sciences of the Universe
Sky surveys (astronomy)
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Summary:We measure the large-scale cross-correlation of quasars with the Ly 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) rs) = 9.0- + or -0.3 and across the line of sight DA(z = 2.36) / rs = 10.8 + or - 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 of H(z = 2.36) = 226 + or - 8kms super(-1) Mpc super(-1) and of the angular diameter distance of DA(z = 2.36) = 1590 + or - 60 Mpc. The measured cross-correlation function and an update of the code to fit the BAO scale (baofit) are made publicly available.
ISSN:1475-7516
1475-7508
1475-7516