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Journal Articles Journal of Cosmology and Astroparticle Physics Year : 2011

The Lyman-α forest in three dimensions: measurements of large scale flux correlations from BOSS 1st-year data

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Anže Slosar
  • Function : Author
Andreu Font-Ribera
  • Function : Author
Matthew M. Pieri
  • Function : Author
Jean-Marc Le Goff
  • Function : Author
E. Aubourg
  • Function : Author
Jon Brinkmann
  • Function : Author
N.G. Busca
  • Function : Author
Bill Carithers
  • Function : Author
Romain Charlassier
  • Function : Author
Marina Cortês
  • Function : Author
Rupert Croft
  • Function : Author
Kyle S. Dawson
  • Function : Author
Daniel Eisenstein
  • Function : Author
J.-C. Hamilton
Shirley Ho
  • Function : Author
Khee-Gan Lee
  • Function : Author
Robert Lupton
  • Function : Author
Patrick Mcdonald
  • Function : Author
Bumbarija Medolin
  • Function : Author
Demitri Muna
  • Function : Author
Jordi Miralda-Escudé
  • Function : Author
Adam D. Myers
  • Function : Author
Robert C. Nichol
  • Function : Author
Patrick Petitjean
  • Function : Author
Yodovina Piškur
  • Function : Author
E. Rollinde
Nicholas P. Ross
  • Function : Author
David J. Schlegel
  • Function : Author
Donald P. Schneider
  • Function : Author
Erin Sheldon
  • Function : Author
Benjamin A. Weaver
  • Function : Author
David H. Weinberg
  • Function : Author
Donald G. York
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Abstract

Using a sample of approximately 14,000 z > 2.1 quasars observed in the first year of the Baryon Oscillation Spectroscopic Survey (BOSS), we measure the three-dimensional correlation function of absorption in the Lyman-α forest. The angle-averaged correlation function of transmitted flux (F = e-τ) is securely detected out to comoving separations of 60 h-1Mpc, the first detection of flux correlations across widely separated sightlines. A quadrupole distortion of the redshift-space correlation function by peculiar velocities, the signature of the gravitational instability origin of structure in the Lyman-α forest, is also detected at high significance. We obtain a good fit to the data assuming linear theory redshift-space distortion and linear bias of the transmitted flux, relative to the matter fluctuations of a standard ΛCDM cosmological model (inflationary cold dark matter with a cosmological constant). At 95% confidence, we find a linear bias parameter 0.16 < b < 0.24 and redshift-distortion parameter 0.44 < β < 1.20, at central redshift z = 2.25, with a well constrained combination b(1+β) = 0.336±0.012. The errors on β are asymmetric, with β = 0 excluded at over 5σ confidence level. The value of β is somewhat low compared to theoretical predictions, and our tests on synthetic data suggest that it is depressed (relative to expectations for the Lyman-α forest alone) by the presence of high column density systems and metal line absorption. These results set the stage for cosmological parameter determinations from three-dimensional structure in the Lyman-α forest, including anticipated constraints on dark energy from baryon acoustic oscillations.

Dates and versions

in2p3-00706730 , version 1 (11-06-2012)

Identifiers

Cite

Anže Slosar, Andreu Font-Ribera, Matthew M. Pieri, James Rich, Jean-Marc Le Goff, et al.. The Lyman-α forest in three dimensions: measurements of large scale flux correlations from BOSS 1st-year data. Journal of Cosmology and Astroparticle Physics, 2011, 09, pp.001. ⟨10.1088/1475-7516/2011/09/001⟩. ⟨in2p3-00706730⟩
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