Measuring redshift-space distortion with future SKA surveys

Alvise Raccanelli, Philip Bull, Stefano Camera, David Bacon, Chris Blake, Olivier Dore, Pedro G. Ferreira, Roy Maartens, Mário G. Santos, Matteo Viel, Gong-Bo Zhao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

The peculiar motion of galaxies can be a particularly sensitive probe of gravitational collapse. As such, it can be used to measure the dynamics of dark matter and dark energy as well the nature of the gravitational laws at play on cosmological scales. Peculiar motions manifest themselves as an overall anisotropy in the measured clustering signal as a function of the angle to the line-of-sight, known as redshift-space distortion (RSD). Limiting factors in this measurement include our ability to model non-linear galaxy motions on small scales and the complexities of galaxy bias. The anisotropy in the measured clustering pattern in redshift-space is also driven by the unknown distance factors at the redshift in question, the Alcock-Paczynski distortion. This weakens growth rate measurements, but permits an extra geometric probe of the Hubble expansion rate. In this short chapter we will briefly describe the scientific background to the RSD technique, and forecast the potential of the SKA phase 1 and the SKA2 to measure the growth rate using both galaxy catalogues and intensity mapping, assessing their competitiveness with current and future optical galaxy surveys.
Original languageEnglish
Title of host publicationAdvancing Astrophysics with the Square Kilometre Array
Subtitle of host publicationAASKA14
PublisherProceedings of Science
Number of pages15
Publication statusPublished - Apr 2015
EventAdvancing Astrophysics with the Square Kilometre Array - Giardini Naxos, Italy
Duration: 9 Jun 201413 Jun 2014

Publication series

Name
PublisherProceedings of Science
ISSN (Print)1824-8039

Conference

ConferenceAdvancing Astrophysics with the Square Kilometre Array
Country/TerritoryItaly
CityGiardini Naxos
Period9/06/1413/06/14

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