TY - JOUR
T1 - COSMOLIKE - cosmological likelihood analyses for photometric galaxy surveys
AU - Krause, Elisabeth
AU - Eifler, Tim
N1 - Funding Information:
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.
Publisher Copyright:
© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
PY - 2017/9/11
Y1 - 2017/9/11
N2 - 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.
AB - 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.
KW - Cosmological parameters
KW - Cosmology: theory
KW - Large-scale structure of universe
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U2 - 10.1093/mnras/stx1261
DO - 10.1093/mnras/stx1261
M3 - Article
AN - SCOPUS:85023758193
VL - 470
SP - 2100
EP - 2112
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 2
ER -