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Title:
The LX-M relation of clusters of galaxies
Authors:
Rykoff, E. S.; Evrard, A. E.; McKay, T. A.; Becker, M. R.; Johnston, D. E.; Koester, B. P.; Nord, B.; Rozo, E.; Sheldon, E. S.; Stanek, R.; Wechsler, R. H.
Affiliation:
AA(Physics Department, University of California at Santa Barbara, 2233B Broida Hall, Santa Barbara, CA 93106, USA), AB(Physics Department, University of Michigan, Ann Arbor, MI 48109, USA; Astronomy Department, University of Michigan, Ann Arbor, MI 48109, USA; Michigan Centre for Theoretical Physics, Ann Arbor, MI 48109, USA), AC(Physics Department, University of Michigan, Ann Arbor, MI 48109, USA; Astronomy Department, University of Michigan, Ann Arbor, MI 48109, USA; Michigan Centre for Theoretical Physics, Ann Arbor, MI 48109, USA), AD(Physics Department, University of Michigan, Ann Arbor, MI 48109, USA; Department of Physics, The University of Chicago, Chicago, IL 60637, USA), AE(Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA), AF(Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637, USA; Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA), AG(Physics Department, University of Michigan, Ann Arbor, MI 48109, USA), AH(The Ohio State University, Columbus, OH 43210, USA), AI(Centre for Cosmology and Particle Physics, Physics Department, New York University, New York, NY 10003, USA), AJ(Astronomy Department, University of Michigan, Ann Arbor, MI 48109, USA), AK(KIPAC, Physics Dept. and SLAC, Stanford University, Stanford, CA 94305, USA)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 387, Issue 1, pp. L28-L32. (MNRAS Homepage)
Publication Date:
06/2008
Origin:
MNRAS
MNRAS Keywords:
galaxies: clusters: general , X-rays: galaxies: clusters
Abstract Copyright:
(c) Journal compilation © 2008 RAS
DOI:
10.1111/j.1745-3933.2008.00476.x
Bibliographic Code:
2008MNRAS.387L..28R

Abstract

We present a new measurement of the scaling relation between X-ray luminosity and total mass for 17000 galaxy clusters in the maxBCG cluster sample. Stacking subsamples within fixed ranges of optical richness, N200, we measure the mean 0.1-2.4 keV X-ray luminosity, <LX>, from the ROSAT All-Sky Survey. The mean mass, <M200>, is measured from weak gravitational lensing of SDSS background galaxies. For 9 <= N200 < 200, the data are well fitted by a power law, <LX>/1042h-2ergs-1 = [12.6+1.4-1.3(stat) +/- 1.6(sys)](<M200>/1014h-1Msolar)1.65+/-0.13. The slope agrees to within 10 per cent with previous estimates based on X-ray selected catalogues, implying that the covariance in LX and N200 at a fixed halo mass is not large. The luminosity intercept is 30 per cent, or 2σ, lower than that determined from the X-ray flux-limited sample of Reiprich & Böhringer, assuming hydrostatic equilibrium. This slight difference could arise from a combination of Malmquist bias and/or systematic error in hydrostatic mass estimates, both of which are expected. The intercept agrees with that derived by Stanek et al. using a model for the statistical correspondence between clusters and haloes in a WMAP3 cosmology with power spectrum normalization σ8 = 0.85. Similar exercises applied to future data sets will allow constraints on the covariance among optical and hot gas properties of clusters at a fixed mass.
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