The WARPS Survey - IV. The X-ray Luminosity-Temperature Relation of High-Redshift Galaxy Clusters

Authors

B. W. Fairley, University of Birmingham
L. R. Jones, University of Birmingham
C. Scharf, Space Telescope Science Institute
H. Ebeling, Institute for Astronomy
E. Perlman, Johns Hopkins University
D. Horner, University of Maryland at College Park
G. Wegner, Dartmouth College
M. Malkan, University of California, Los Angeles

Document Type

Article

Publication Date

7-11-2000

Publication Title

Monthly Notices of the Royal Astronomical Society

Department

Department of Physics and Astronomy

Abstract

We present a measurement of the cluster X-ray luminosity-temperature (L-T) relation out to high redshift (z∼0.8). Combined ROSAT PSPC spectra of 91 galaxy clusters detected in the Wide Angle ROSAT Pointed Survey (WARPS) are simultaneously fitted in redshift and luminosity bins. The resulting temperature and luminosity measurements of these bins, which occupy a region of the high-redshift L-T relation not previously sampled, are compared with existing measurements at low redshift in order to constrain the evolution of the L-T relation. We find the best fit to low-redshift (z<0.2) cluster data, at T>1 keV, to be L∝T^3.15±0.06. Our data are consistent with no evolution in the normalization of the L-T relation up to z∼0.8. Combining our results with ASCA measurements taken from the literature, we find η=0.19±0.38 (for Ω₀=1, with 1σ errors) where L_Bol∝(1+z)^ηT^3.15, or η=0.60±0.38 for Ω₀=0.3. This lack of evolution is considered in terms of the entropy-driven evolution of clusters. Further implications for cosmological constraints are also discussed.

DOI

10.1046/j.1365-8711.2000.03512.x

Dartmouth Digital Commons Citation

Fairley, B. W.; Jones, L. R.; Scharf, C.; Ebeling, H.; Perlman, E.; Horner, D.; Wegner, G.; and Malkan, M., "The WARPS Survey - IV. The X-ray Luminosity-Temperature Relation of High-Redshift Galaxy Clusters" (2000). Dartmouth Scholarship. 1871.
https://digitalcommons.dartmouth.edu/facoa/1871