THE MASS-L{sub x} RELATION FOR MODERATE LUMINOSITY X-RAY CLUSTERS

Journal Article · Sat Jan 01 04:00:00 EST 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/726/1/48· OSTI ID:21567699

Hoekstra, Henk ^[1]; Donahue, Megan; Voit, G Mark ^[2]; Conselice, Christopher J ^[3]; McNamara, Brian R ^[4]

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1. Leiden Observatory, Leiden University, Leiden (Netherlands)
2. Physics and Astronomy Department, Michigan State University, East Lansing, MI (United States)
3. School of Physics and Astronomy, University of Nottingham, University Park, NG9 2RD (United Kingdom)
4. Department of Physics and Astronomy, University of Waterloo, Waterloo, ON (Canada)

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 F814W 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{sub 2500} and L{sub X} to be {sigma}{sub log} L{sub X}|M =0.23{sub -0.04}{sup +0.10}. The best-fit power-law slope and normalization are found to be {alpha} = 0.68 {+-} 0.07 and M{sub X} = (1.2 {+-} 0.12) x h{sup -1}{sub 70}10{sup 14} M{sub sun} (for L{sub X} = 2 x 10{sup 44} h{sup -2}{sub 70} erg s{sup -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{sub X} when clusters are binned by richness.

• OSTI ID: 21567699
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 726; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
GALAXIES
GALAXY CLUSTERS
LUMINOSITY
MASS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
X-RAY GALAXIES