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American Astronomical Society, Astrophysical Journal, 1(644), p. 71-79, 2006

DOI: 10.1086/503418

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Dark Energy Constraints from the CTIO Lensing Survey

Journal article published in 2005 by Mike Jarvis, Bhuvnesh Jain, Gary Bernstein ORCID, Derek Dolney
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We perform a cosmological parameter analysis of the 75 square degree CTIO lensing survey in conjunction with CMB and Type Ia supernovae data. For Lambda CDM cosmologies, we find that the amplitude of the power spectrum at low redshift is given by sigma_8 = 0.81 (+0.15,-0.10, 95% c.l.), where the error bar includes both statistical and systematic errors. The total of all systematic errors is smaller than the statistical errors, but they do make up a significant fraction of the error budget. We find that weak lensing improves the constraints on dark energy as well. The (constant) dark energy equation of state parameter, w, is measured to be -0.89 (+0.16,-0.21, 95% c.l.). Marginalizing over a constant $w$ slightly changes the estimate of sigma_8 to 0.79 (+0.17, -0.14, 95% c.l.). We also investigate variable w cosmologies, but find that the constraints weaken considerably; the next generation surveys are needed to obtain meaningful constraints on the possible time evolution of dark energy. ; Comment: 10 pages, 4 figures, v3 matches version accepted by ApJ. Significant changes in section 4.2.3. Otherwise, mostly minor changes