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Galaxy Cluster Gas Mass Fractions From Sunyaev-Zeldovich Effect Measurements: Constraints on Omega(M)Using sensitive centimeter-wave receivers mounted on the Owens Valley Radio Observatory and Berkeley-Illinois-Maryland-Association millimeter arrays, we have obtained interferometric measurements of the Sunyaev-Zeldovich(SZ) effect toward massive galaxy clusters. We use the SZ data to determine the pressure distribution of the cluster gas and, in combination with published X-ray temperatures, to infer the gas mass and total gravitational mass of 18 clusters. The gas mass fraction, f(g), is calculated for each cluster and is extrapolated to the fiducial radius r(500) using the results of numerical simulations. The mean f(g) within r(500) is 0.081(+ 0.009 / - 0.011) per h(100) (statistical uncertainty at 68% confidence level, assuming Omega(M) = 0.3, Omega(Lambda) = 0.7). We discuss possible sources of systematic errors in the mean f(sub g) measurement. We derive an upper limit for Omega(M) from this sample under the assumption that the mass composition of clusters within r(500) reflects the universal mass composition: Omega(M)h is less than or equal to Omega(B)/f(g). The gas mass fractions depend on cosmology through the angular diameter distance and the r(500) correction factors. For a flat universe (Omega(Lambda) is identical with 1 - Omega(M)) and h = 0.7, we find the measured gas mass fractions are consistent with Omega(M) is less than 0.40, at 68% confidence. Including estimates of the baryons contained in galaxies and the baryons which failed to become bound during the cluster formation process, we find Omega(M) is approximately equal to 0.25.
Document ID
20010089703
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Grego, Laura
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Carlstrom, John E.
(Chicago Univ. Chicago, IL United States)
Reese, Erik D.
(Chicago Univ. Chicago, IL United States)
Holder, Gilbert P.
(Chicago Univ. Chicago, IL United States)
Holzapfel, William L.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Joy, Marshall K.
(Alabama Univ. Huntsville, AL United States)
Mohr, Joseph J.
(Chicago Univ. Chicago, IL United States)
Patel, Sandeep
(California Univ. Berkeley, CA United States)
Date Acquired
August 20, 2013
Publication Date
May 1, 2001
Publication Information
Publication: Astrophysical Journal
Publisher: American Astronomical Society
Volume: 552
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAS8-39073
CONTRACT_GRANT: NSF AST-96-19938
CONTRACT_GRANT: PF8-1003
CONTRACT_GRANT: NSF AST-96-13717
CONTRACT_GRANT: NAG5-7986
Distribution Limits
Public
Copyright
Other

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