Lensing and time-delay contributions to galaxy correlations
Abstract
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.
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.Attached Files
Submitted - 1311.6813v2.pdf
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Additional details
- Eprint ID
- 69058
- Resolver ID
- CaltechAUTHORS:20160715-110504903
- NASA/JPL/Caltech
- South African Square Kilometre Array Project
- ST/H002774/1
- Science and Technology Facilities Council (STFC)
- National Research Foundation (South Africa)
- Royal Society
- Department for Business, Innovation & Skills (UK)
- Created
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2016-07-19Created from EPrint's datestamp field
- Updated
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2023-03-15Created from EPrint's last_modified field