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Lensing and time-delay contributions to galaxy correlations

Raccanelli, Alvise and Bertacca, Daniele and Maartens, Roy and Clarkson, Chris and Doré, Olivier (2016) Lensing and time-delay contributions to galaxy correlations. General Relativity and Gravitation, 48 (7). Art. No. 84. ISSN 0001-7701.

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Galaxy clustering on very large scales can be probed via the 2-point correlation function in the general case of wide and deep separations, including all the lightcone and relativistic effects. Using our recently developed formalism, we analyze the behavior of the local and integrated contributions and how these depend on redshift range, linear and angular separations and luminosity function. Relativistic corrections to the local part of the correlation can be non-negligible but they remain generally sub-dominant. On the other hand, the additional correlations arising from lensing convergence and time-delay effects can become very important and even dominate the observed total correlation function. We investigate different configurations formed by the observer and the pair of galaxies, and we find that the case of near-radial large-scale separations is where these effects will be the most important.

Item Type:Article
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URLURL TypeDescription Paper
Doré, Olivier0000-0002-5009-7563
Additional Information:© 2016 Springer Science+Business Media New York. Received: 22 February 2016; Accepted: 12 May 2016; First online: 02 June 2016. We thank Guido Pettinari for useful suggestions and Nicola Bartolo, Francis-Yan Cyr-Racine, Ruth Durrer, Chris Hirata, Sabino Matarrese, Roland de Putter and Masahiro Takada for helpful discussions. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. DB and RM are supported by the South African Square Kilometre Array Project. RM is supported by the STFC (UK) (grant no. ST/H002774/1). RM and CC are supported by the National Research Foundation (NRF, South Africa). DB, RM and CC were supported by a Royal Society (UK)/ NRF (SA) exchange grant. Some of the numerical computations were performed on the COSMOS supercomputer, part of the DiRAC HPC, a facility funded by STFC and BIS.
Funding AgencyGrant Number
South African Square Kilometre Array ProjectUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/H002774/1
National Research Foundation (South Africa)UNSPECIFIED
Department for Business, Innovation & Skills (UK)UNSPECIFIED
Subject Keywords:Galaxy clustering – Correlation function – Relativistic effects
Issue or Number:7
Record Number:CaltechAUTHORS:20160715-110504903
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Official Citation:Raccanelli, A., Bertacca, D., Maartens, R. et al. Gen Relativ Gravit (2016) 48: 84. doi:10.1007/s10714-016-2076-8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69058
Deposited By: Tony Diaz
Deposited On:19 Jul 2016 23:41
Last Modified:03 Oct 2019 10:18

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