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

Aňze Slosar, Andreu Font-Ribera, Matthew M. Pieri, James Rich, Jean Marc Le Goff, Eric Aubourg, Jon Brinkmann, Nicolas Busca, Bill Carithers, Romain Charlassier, Marina Cor̂es, Rupert Croft, Kyle S. Dawson, Daniel Eisenstein, Jean Christophe Hamilton, Shirley Ho, Khee Gan Lee, Robert Lupton, Patrick McDonald, Bumbarija MedolinDemitri Muna, Jordi Miralda-Escudé, Adam D. Myers, Robert C. Nichol, Nathalie Palanque-Delabrouille, Isabelle Pris, Patrick Petitjean, Yodovina Pǐskur, Emmanuel Rollinde, Nicholas P. Ross, David J. Schlegel, Donald P. Schneider, Erin Sheldon, Benjamin A. Weaver, David H. Weinberg, Christophe Yeche, Donald G. York

Research output: Contribution to journalArticle

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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 ) 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) = 0.3360.012. 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.

Original languageEnglish (US)
Article number001
JournalJournal of Cosmology and Astroparticle Physics
Volume2011
Issue number9
DOIs
StatePublished - Sep 2011

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baryons
oscillations
confidence
gravitational instability
dark energy
quasars
dark matter
quadrupoles
signatures
acoustics
predictions
metals

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Cite this

Slosar, Aňze ; Font-Ribera, Andreu ; Pieri, Matthew M. ; Rich, James ; Le Goff, Jean Marc ; Aubourg, Eric ; Brinkmann, Jon ; Busca, Nicolas ; Carithers, Bill ; Charlassier, Romain ; Cor̂es, Marina ; Croft, Rupert ; Dawson, Kyle S. ; Eisenstein, Daniel ; Hamilton, Jean Christophe ; Ho, Shirley ; Lee, Khee Gan ; Lupton, Robert ; McDonald, Patrick ; Medolin, Bumbarija ; Muna, Demitri ; Miralda-Escudé, Jordi ; Myers, Adam D. ; Nichol, Robert C. ; Palanque-Delabrouille, Nathalie ; Pris, Isabelle ; Petitjean, Patrick ; Pǐskur, Yodovina ; Rollinde, Emmanuel ; Ross, Nicholas P. ; Schlegel, David J. ; Schneider, Donald P. ; Sheldon, Erin ; Weaver, Benjamin A. ; Weinberg, David H. ; Yeche, Christophe ; York, Donald G. / The Lyman-α forest in three dimensions : Measurements of large scale UX correlations from BOSS 1st-year data. In: Journal of Cosmology and Astroparticle Physics. 2011 ; Vol. 2011, No. 9.
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title = "The Lyman-α forest in three dimensions: Measurements of large scale UX correlations from BOSS 1st-year data",
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) = 0.3360.012. 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.",
author = "Aňze Slosar and Andreu Font-Ribera and Pieri, {Matthew M.} and James Rich and {Le Goff}, {Jean Marc} and Eric Aubourg and Jon Brinkmann and Nicolas Busca and Bill Carithers and Romain Charlassier and Marina Cor̂es and Rupert Croft and Dawson, {Kyle S.} and Daniel Eisenstein and Hamilton, {Jean Christophe} and Shirley Ho and Lee, {Khee Gan} and Robert Lupton and Patrick McDonald and Bumbarija Medolin and Demitri Muna and Jordi Miralda-Escud{\'e} and Myers, {Adam D.} and Nichol, {Robert C.} and Nathalie Palanque-Delabrouille and Isabelle Pris and Patrick Petitjean and Yodovina Pǐskur and Emmanuel Rollinde and Ross, {Nicholas P.} and Schlegel, {David J.} and Schneider, {Donald P.} and Erin Sheldon and Weaver, {Benjamin A.} and Weinberg, {David H.} and Christophe Yeche and York, {Donald G.}",
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Slosar, A, Font-Ribera, A, Pieri, MM, Rich, J, Le Goff, JM, Aubourg, E, Brinkmann, J, Busca, N, Carithers, B, Charlassier, R, Cor̂es, M, Croft, R, Dawson, KS, Eisenstein, D, Hamilton, JC, Ho, S, Lee, KG, Lupton, R, McDonald, P, Medolin, B, Muna, D, Miralda-Escudé, J, Myers, AD, Nichol, RC, Palanque-Delabrouille, N, Pris, I, Petitjean, P, Pǐskur, Y, Rollinde, E, Ross, NP, Schlegel, DJ, Schneider, DP, Sheldon, E, Weaver, BA, Weinberg, DH, Yeche, C & York, DG 2011, 'The Lyman-α forest in three dimensions: Measurements of large scale UX correlations from BOSS 1st-year data', Journal of Cosmology and Astroparticle Physics, vol. 2011, no. 9, 001. https://doi.org/10.1088/1475-7516/2011/09/001

The Lyman-α forest in three dimensions : Measurements of large scale UX correlations from BOSS 1st-year data. / Slosar, Aňze; Font-Ribera, Andreu; Pieri, Matthew M.; Rich, James; Le Goff, Jean Marc; Aubourg, Eric; Brinkmann, Jon; Busca, Nicolas; Carithers, Bill; Charlassier, Romain; Cor̂es, Marina; Croft, Rupert; Dawson, Kyle S.; Eisenstein, Daniel; Hamilton, Jean Christophe; Ho, Shirley; Lee, Khee Gan; Lupton, Robert; McDonald, Patrick; Medolin, Bumbarija; Muna, Demitri; Miralda-Escudé, Jordi; Myers, Adam D.; Nichol, Robert C.; Palanque-Delabrouille, Nathalie; Pris, Isabelle; Petitjean, Patrick; Pǐskur, Yodovina; Rollinde, Emmanuel; Ross, Nicholas P.; Schlegel, David J.; Schneider, Donald P.; Sheldon, Erin; Weaver, Benjamin A.; Weinberg, David H.; Yeche, Christophe; York, Donald G.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2011, No. 9, 001, 09.2011.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The Lyman-α forest in three dimensions

T2 - Measurements of large scale UX correlations from BOSS 1st-year data

AU - Slosar, Aňze

AU - Font-Ribera, Andreu

AU - Pieri, Matthew M.

AU - Rich, James

AU - Le Goff, Jean Marc

AU - Aubourg, Eric

AU - Brinkmann, Jon

AU - Busca, Nicolas

AU - Carithers, Bill

AU - Charlassier, Romain

AU - Cor̂es, Marina

AU - Croft, Rupert

AU - Dawson, Kyle S.

AU - Eisenstein, Daniel

AU - Hamilton, Jean Christophe

AU - Ho, Shirley

AU - Lee, Khee Gan

AU - Lupton, Robert

AU - McDonald, Patrick

AU - Medolin, Bumbarija

AU - Muna, Demitri

AU - Miralda-Escudé, Jordi

AU - Myers, Adam D.

AU - Nichol, Robert C.

AU - Palanque-Delabrouille, Nathalie

AU - Pris, Isabelle

AU - Petitjean, Patrick

AU - Pǐskur, Yodovina

AU - Rollinde, Emmanuel

AU - Ross, Nicholas P.

AU - Schlegel, David J.

AU - Schneider, Donald P.

AU - Sheldon, Erin

AU - Weaver, Benjamin A.

AU - Weinberg, David H.

AU - Yeche, Christophe

AU - York, Donald G.

PY - 2011/9

Y1 - 2011/9

N2 - 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) = 0.3360.012. 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.

AB - 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) = 0.3360.012. 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.

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