The XMM Cluster Survey: evolution of the velocity dispersion-temperature relation over half a Hubble time

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Wilson, S (Author) Other; Hilton, M (Author) Other; Rooney, PJ (Author) Other; Caldwell, C (Author) Other; Kay, ST (Author) Other; Collins, CA (Author) Other; McCarthy, IG (Author) Other; Romer, AK (Author) Other; Bermeo, A (Author) Other; Bernstein, R (Author) Other; da Costa, L (Author) Other; Gifford, D (Author) Other; Hollowood, D (Author) Other; Hoyle, B (Author) Other; Jeltema, T (Author) Other; Liddle, AR (Author) Other; Maia, MAG (Author) Other; Mann, RG (Author) Other; Mayers, JA (Author) Other; Mehrtens, N (Author) Other; Miller, CJ (Author) Other; Nichol, RC (Author) Other; Ogando, R (Author) Other; Sahlen, M (Author) Other; Stahl, B (Author) Other; Stott, JP (Author) Other; Thomas, PA (Author) Other; viana, ptp (Author) FCUP; Wilcox, H (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 463

Pages: 413-428

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 6 Citations

Other information

Authenticus ID: P-00M-77Q

DOI: 10.1093/mnras/stw1947

Abstract (EN): We measure the evolution of the velocity dispersion-temperature (sigma(v)-T-X) relation up to z = 1 using a sample of 38 galaxy clusters drawn from the XMM Cluster Survey. This work improves upon previous studies by the use of a homogeneous cluster sample and in terms of the number of high-redshift clusters included. We present here new redshift and velocity dispersion measurements for 12 z > 0.5 clusters observed with the Gemini Multi Object Spectographs instruments on the Gemini telescopes. Using an orthogonal regression method, we find that the slope of the relation is steeper than that expected if clusters were self-similar, and that the evolution of the normalization is slightly negative, but not significantly different from zero (sigma(v) alpha T0.86+/-0.14E(z)(-0.37+/-0.33)). We verify our results by applying our methods to cosmological hydrodynamical simulations. The lack of evolution seen in our data is consistent with simulations that include both feedback and radiative cooling.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16