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

被引：141

作者：

Slosar, Anze ^{[1
]}

Font-Ribera, Andreu ^{[2
]}

Pieri, Matthew M. ^{[3
,4
]}

Rich, James ^{[5
]}

Le Goff, Jean-Marc ^{[5
]}

Aubourg, Eric ^{[5
,6
]}

Brinkmann, Jon ^{[7
]}

Busca, Nicolas ^{[6
]}

Carithers, Bill ^{[8
]}

Charlassier, Romain ^{[5
]}

Cortes, Marina ^{[8
]}

Croft, Rupert ^{[9
]}

Dawson, Kyle S. ^{[10
]}

Eisenstein, Daniel ^{[11
]}

Hamilton, Jean-Christophe ^{[6
]}

Ho, Shirley

Lee, Khee-Gan ^{[12
]}

Lupton, Robert ^{[12
]}

McDonald, Patrick ^{[1
,8
]}

Medolin, Bumbarija

Muna, Demitri ^{[13
]}

Miralda-Escude, Jordi ^{[14
,15
]}

Myers, Adam D. ^{[16
,17
]}

Nichol, Robert C. ^{[18
]}

Palanque-Delabrouille, Nathalie ^{[5
]}

Paris, Isabelle ^{[19
,20
]}

Petitjean, Patrick ^{[19
,20
]}

Piskur, Yodovina ^{[12
]}

Rollinde, Emmanuel ^{[19
,20
]}

Ross, Nicholas P. ^{[8
]}

Schlegel, David J. ^{[8
]}

Schneider, Donald P. ^{[21
]}

Sheldon, Erin ^{[1
]}

Weaver, Benjamin A.

Weinberg, David H. ^{[4
]}

Yeche, Christophe ^{[5
]}

York, Donald G. ^{[22
,23
]}

机构：

[1] Brookhaven Natl Lab, Upton, NY 11375 USA

[2] Inst Ciencies Espai CSIC IEEC, Fac Ciencies, Bellaterra, Catalonia, Spain

[3] Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA

[4] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[5] CEA, Ctr Saclay, IRFU, F-91191 Gif Sur Yvette, France

[6] Univ Paris 07, APC, CNRS, IN2P3,CEA,Observ Paris, Paris, France

[7] Apache Point Observ, Sunspot, NM 88349 USA

[8] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[9] Carnegie Mellon Univ, Bruce & Astrid McWilliams Ctr Cosmol, Pittsburgh, PA 15213 USA

[10] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[11] Harvard Coll Observ, Cambridge, MA 02138 USA

[12] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[13] NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

[14] Inst Catalana Recerca & Estudis Avancats, Barcelona, Catalonia, Spain

[15] Univ Barcelona, IEEC, Inst Ciencies Cosmos, E-08028 Barcelona, Catalonia, Spain

[16] Univ Illinois, Dept Astron, Urbana, IL 61801 USA

[17] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA

[18] Univ Portsmouth, ICG, Portsmouth PO1 3FX, Hants, England

[19] Inst Astrophys, CNRS, F-75014 Paris, France

[20] Univ Paris 06, F-75014 Paris, France

[21] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[22] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[23] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2011年 / 09期

基金：

美国国家科学基金会;

关键词：

Lyman alpha forest; cosmic web; baryon acoustic oscillations; DIGITAL SKY SURVEY; EQUATION-OF-STATE; POWER SPECTRUM; INTERGALACTIC MEDIUM; GRAVITATIONAL COLLAPSE; COSMOLOGICAL GEOMETRY; MASS FLUCTUATIONS; CLOSE PAIRS; ABSORPTION; MATTER;

D O I：

10.1088/1475-7516/2011/09/001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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-alpha forest. The angle-averaged correlation function of transmitted flux (F = e(-tau)) is securely detected out to comoving separations of 60 h(-1) Mpc, 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-alpha 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 ACDM 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 < beta < 1.20, at central redshift z = 2.25, with a well constrained combination b (1+beta) = 0.336 +/- 0.012. The errors on beta are asymmetric, with beta = 0 excluded at over 5 sigma confidence level. The value of beta is somewhat low compared to theoretical predictions, and our tests on synthetic data suggest that it is depressed (relative to expectations for the Lyman-alpha 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-alpha forest, including anticipated constraints on dark energy from baryon acoustic oscillations.

引用

页数：51

共 88 条

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