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COSMOLIKE – cosmological likelihood analyses for photometric galaxy surveys

Krause, Elisabeth and Eifler, Tim (2017) COSMOLIKE – cosmological likelihood analyses for photometric galaxy surveys. Monthly Notices of the Royal Astronomical Society, 470 (2). pp. 2100-2112. ISSN 0035-8711.

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We explore strategies to extract cosmological constraints from a joint analysis of cosmic shear, galaxy–galaxy lensing, galaxy clustering, cluster number counts and cluster weak lensing. We utilize the COSMOLIKE software to simulate results from a Large Synoptic Survey Telescope (LSST) like data set, specifically, we (1) compare individual and joint analyses of the different probes, (2) vary the selection criteria for lens and source galaxies, (3) investigate the impact of blending, (4) investigate the impact of the assumed cosmological model in multiprobe covariances, (6) quantify information content as a function of scales and (7) explore the impact of intrinsic galaxy alignment in a multiprobe context. Our analyses account for all cross-correlations within and across probes and include the higher-order (non-Gaussian) terms in the multiprobe covariance matrix. We simultaneously model cosmological parameters and a variety of systematics, e.g. uncertainties arising from shear and photo-z calibration, cluster mass-observable relation, galaxy intrinsic alignment and galaxy bias (up to 54 parameters altogether). We highlight two results: first, increasing the number density of source galaxies by ∼30 per cent, which corresponds to solving blending for LSST, only gains little information. Secondly, including small scales in clustering and galaxy–galaxy lensing, by utilizing halo occupation distribution models, can substantially boost cosmological constraining power.

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Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 May 19. Received 2017 May 17; in original form 2016 August 31. Published: 23 May 2017. We thank Sarah Bridle, Scott Dodelson, Joe Zuntz, Risa Wechsler, Gary Bernstein, Bhuvnesh Jain and Josh Frieman for frequent and fruitful discussions on the topic of multiprobe cosmology. EK thanks Benjamin Joachimi and Joe Zuntz and for code-comparison efforts. EK acknowledges support from NSF grant AST-0908027. This paper is based upon work supported in part by NASA ROSES grant ATP 16-ATP16-0084, by the National Science Foundation under Grant No. 1066293 and the hospitality of the Aspen Center for Physics. Part of the research was carried out at the Jet Propulsion Laboratory (JPL), California Institute of Technology, under a contract with the National Aeronautics and Space Administration. All computations were performed on the JPL High Performance Computing systems; we thank the JPL Super Computing Consult team for outstanding support.
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Subject Keywords:cosmological parameters – large-scale structure of Universe – cosmology: theory
Issue or Number:2
Record Number:CaltechAUTHORS:20170825-153359909
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Official Citation:Elisabeth Krause, Tim Eifler; COSMOLIKE – cosmological likelihood analyses for photometric galaxy surveys, Monthly Notices of the Royal Astronomical Society, Volume 470, Issue 2, 11 September 2017, Pages 2100–2112,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80815
Deposited By: Tony Diaz
Deposited On:28 Aug 2017 19:49
Last Modified:03 Oct 2019 18:35

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