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THE MASS-LxRELATION FOR MODERATE LUMINOSITY X-RAY CLUSTERS

Year: 2010
Type: article
Abstract: We present measurements of the masses of a sample of 25 moderate X-ray luminosity clusters of galaxies from the 160 square degree ROSAT survey. The masses were obtained from a weak-lensing analysis of deep F 814 W images obtained using the Advanced Camera for Surveys. We present an accurate empirical correction for the effect of charge transfer (in)efficiency on the shapes of faint galaxies. A significant lensing signal is detected around most of the clusters. The lensing mass correlates tightly with the cluster richness. We measured the intrinsic scatter in the scaling relation between M 2500 and L X to be . The best-fit power-law slope and normalization are found to be α = 0.68 ± 0.07 and M X = (1.2 ± 0.12) × h −1 70 10 14 M ☉ (for L X = 2 × 10 44 h −2 70 erg s −1 ). These results agree well with a number of recent studies, but the normalization is lower compared to the study of Rykoff et al. One explanation for this difference may be the fact that (sub)structures projected along the line of sight boost both the galaxy counts and the lensing mass. Such superpositions lead to an increased mass at a given L X when clusters are binned by richness.
DOI: 10.1088/0004-637x/726/1/48
Institutions: Leiden University, University of Victoria, Leiden Observatory, Michigan State University, University of Nottingham, University of Waterloo, Smithsonian Astrophysical Observatory, Perimeter Institute, Center for Astrophysics Harvard & Smithsonian
Language: English
Open Access status: bronze
Funders: National Aeronautics and Space Administration, Space Telescope Science Institute, Centre National d’Etudes Spatiales, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council
OpenAlex ID: W1975777954
FWCI: 3.404
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Cited by: 43
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