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Characterising the local void with the X-ray cluster survey REFLEX II

Published online by Cambridge University Press:  12 October 2016

Chris A. Collins ,
Hans Böhringer ,
Martyn Bristow  and
Gayoung Chon
Chris A. Collins
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK email: [email protected]
Hans Böhringer
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, D-85748 Garching, Germany email: [email protected]
Martyn Bristow
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK email: [email protected]
Gayoung Chon
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, D-85748 Garching, Germany email: [email protected]
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Abstract

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Claims of a significant underdensity or void in the density distribution on scales out to ≃ 300 Mpc have recently been made using samples of galaxies. We present the results of an alternative test of the matter distribution on these scales using clusters of galaxies, which provide an independent and powerful probe of large-scale structure. We study the density distribution of X-ray clusters from the ROSAT-based REFLEX II catalogue, which covers a contiguous area of 4.24 steradians in the southern hempsphere (34% of the entire sky). Using the normalised comoving number density of clusters we find evidence for an underdensity (30-40%), out to z∼ 0.04, equivalent to ≃170 Mpc and with a significance of 3.4σ. On scales between 300 Mpc and 1 Gpc the distribution of REFLEX II clusters is consistent with being uniform. We also confirm recent results that the underdensity has a large contribution from the direction of the South Galactic Cap region, but is not significant in the direction of the Northern Galactic Cap as viewed from the southern sky. Both the limited size of the detected underdensity and its lack of isotropy, argue against the idea that the Type Ia supernovae data can be explained without the need for dark energy.

Keywords

galaxies: clusterscosmology: large-scale structure of universegeneralX-rays: galaxies: clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 585 - 588
Copyright
Copyright © International Astronomical Union 2016 

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