Journal article
Cosmology from clustering of lyα galaxies: Breaking non-gravitational lyα radiative transfer degeneracies using the bispectrum
B Greig, E Komatsu, JSB Wyithe
Monthly Notices of the Royal Astronomical Society | Published : 2013
DOI: 10.1093/mnras/stt292
Abstract
Large surveys for Lyα emitting (LAE) galaxies have been proposed as a new method for measuring clustering of the galaxy population at high redshift with the goal of determining cosmological parameters. However, Lyα radiative transfer effects may modify the observed clustering of LAE galaxies in a way that mimics gravitational effects, potentially reducing the precision of cosmological constraints. We investigate the impact of Lyα radiative transfer effects on the observed clustering of LAE galaxies. In particular, we focus on the effects of the intergalactic medium velocity gradients, local density within the environment of an LAE galaxy and ionizing background fluctuations. For example, the..
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Awarded by National Science Foundation
Funding Acknowledgements
BG acknowledges the support of the Australian Postgraduate Award. The Centre for All-sky Astrophysics is an Australian Research Council Centre of Excellence, funded by grant CE110001020. BG would also like to acknowledge the partial travel support to the USA provided by the Astronomical Society of Australia (ASA). BG would like to thank the Texas Cosmology Center at the University of Texas at Austin for their hospitality during this work, and the Kavli Institute for the Physics and Mathematics of the Universe for their hospitality during the completion of this work. We would like to thank Donghui Jeong for helpful discussions contributing to the completion of this work as well as to the derivation provided in Appendix C, and Eric Gawiser for useful comments on the draft. EK is supported in part by NSF grant AST-0807649 and NASA grant NNX08AL43G.