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Measuring cluster gas mass fractions with X-ray, Sunyaev-Zel'dovich effect, and weak lensing data

Published online by Cambridge University Press:  06 October 2004

S. LaRoque ,
M. Bonamente ,
J. E. Carlstrom ,
M. Joy  and
E. D. Reese
S. LaRoque
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637
M. Bonamente
Affiliation:
Department of Physics, University of Alabama, Huntsville, AL 35899
J. E. Carlstrom
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 Kavli Institute for Cosmological Physics, Department of Physics, Enrico Fermi Institute, University of Chicago, Chicago, IL 60637
M. Joy
Affiliation:
Department of Space Science, NASA Marshall Space Flight Center, Huntsville, AL 35812
E. D. Reese
Affiliation:
Department of Physics, University of California, Berkeley, CA 94720
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Abstract

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We estimate the gas mass fractions for a sample of 39 high-$z$ galaxy clusters using a combination of three different data sets: Chandra X-ray data, OVRO/BIMA centimeter-wave Sunyaev-Zel'dovich Effect (SZE) data, and published weak gravitational lensing data. The gas mass fraction $f_g$ is calculated in three different ways. The X-ray surface brightness and SZE decrement are used independently to determine the number of baryons in the intracluster gas and subsequently the gas mass; the total mass follows assuming spherical symmetry and hydrostatic equilibrium (HSE). The third, less model-dependent approach is to calculate the projected SZE gas mass along a cylinder and divide by the total mass derived from the lensing data. The goal of this study is to compare the $f_g$ results from the three different methods to investigate systematic uncertainties associated with clumping of the intracluster medium, cluster elongation, and the HSE assumption.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUC195 , March 2004 , pp. 163 - 165
Copyright
© 2004 International Astronomical Union