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Impact of redshift information on cosmological applications with next-generation radio surveys

Camera, Stefano and Santos, Mário G. and Bacon, David J. and Jarvis, Matt J. and McAlpine, Kim and Norris, Ray P. and Raccanelli, Alvise and Röttgering, Huub (2012) Impact of redshift information on cosmological applications with next-generation radio surveys. Monthly Notices of the Royal Astronomical Society, 427 (3). pp. 2079-2088. ISSN 0035-8711. doi:10.1111/j.1365-2966.2012.22073.x.

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In this paper, we explore how the forthcoming generation of large-scale radio continuum surveys, with the inclusion of some degree of redshift information, can constrain cosmological parameters. By cross-matching these radio surveys with shallow optical to near-infrared surveys, we can essentially separate the source distribution into a low- and a high-redshift sample, thus providing a constraint on the evolution of cosmological parameters such as those related to dark energy. We examine two radio surveys, the Evolutionary Map of the Universe (EMU) and the Westerbork Observations of the Deep APERTIF Northern sky (WODAN). A crucial advantage is their combined potential to provide a deep, full-sky survey. The surveys used for the cross-identifications are SkyMapper and Sloan Digital Sky Survey, for the southern and northern skies, respectively. We concentrate on the galaxy clustering angular power spectrum as our benchmark observable, and find that the possibility of including such low-redshift information yields major improvements in the determination of cosmological parameters. With this approach, and provided a good knowledge of the galaxy bias evolution, we are able to put strict constraints on the dark energy parameters, i.e. w_0 = −0.9 ± 0.041 and w_a = −0.24 ± 0.13, with Type Ia supernovae and cosmic microwave background priors (with a one-parameter bias in this case); this corresponds to a Figure of Merit (FoM) >600, which is twice better than what is obtained by using only the cross-identified sources and greater than four time better than the case without any redshift information at all.

Item Type:Article
Related URLs:
URLURL TypeDescription
Santos, Mário G.0000-0003-3892-3073
Jarvis, Matt J.0000-0001-7039-9078
Norris, Ray P.0000-0002-4597-1906
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 September 6; Received 2012 September 6; in original form 2012 May 4. Article first published online: 20 Nov. 2012. We thank the referee for a careful reading of our manuscript and very insightful comments. SC and MGS acknowledge support from FCT-Portugal under grant PTDC/FIS/100170/2008. SC’s work is funded by FCT-Portugal under Post-Doctoral Grant SFRH/BPD/80274/2011. 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. The authors would also like to thank Gong-Bo Zhao for his friendly and gratuitous contribution.
Funding AgencyGrant Number
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS/100170/2008
Fundação para a Ciência e a Tecnologia (FCT)SFRH/BPD/80274/2011
Subject Keywords:cosmological parameters; cosmology: observations; large-scale structure of universe; radio continuum: galaxies
Issue or Number:3
Record Number:CaltechAUTHORS:20130115-160050967
Persistent URL:
Official Citation:Camera, S., Santos, M. G., Bacon, D. J., Jarvis, M. J., McAlpine, K., Norris, R. P., Raccanelli, A. and Röttgering, H. (2012), Impact of redshift information on cosmological applications with next-generation radio surveys. Monthly Notices of the Royal Astronomical Society, 427: 2079–2088. doi: 10.1111/j.1365-2966.2012.22073.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36409
Deposited By: Jason Perez
Deposited On:16 Jan 2013 21:12
Last Modified:09 Nov 2021 23:22

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