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An improved approach to measuring H_0 using X-ray and SZ observations of galaxy clusters | | R.W. Schmidt
; S.W. Allen
; A.C. Fabian
; | | Date: |
19 May 2004 | | Journal: | Mon.Not.Roy.Astron.Soc. 352 (2004) 1413 | | Subject: | astro-ph | | Affiliation: | Potsdam University), S.W. Allen (IoA Cambridge), A.C. Fabian (IoA Cambridge | | Abstract: | We present an improved method for predicting the Sunyaev-Zeldovich (SZ) effect in galaxy clusters from spatially-resolved, spectroscopic X-ray data. Using the deprojected electron density and temperature profiles measured within a fraction of the virial radius, and assuming a Navarro, Frenk & White (1995) mass model, we show how the pressure profile of the X-ray gas can be extrapolated to large radii, allowing the Comptonization parameter profile for the cluster to be predicted precisely. We apply our method to Chandra observations of three X-ray luminous, dynamically relaxed clusters with published SZ data: RX J1347.5-1145, Abell 1835 and Abell 478. Combining the predicted and observed SZ signals, we determine improved estimates for the Hubble constant from each cluster and obtain a weighted mean of H_0=69pm8km/s/Mpc for a cosmology with Omega_m=0.3 and Omega_Lambda=0.7. This result is in good agreement with independent findings from the Hubble Key Project and the combination of cosmic microwave background and galaxy cluster data. | | Source: | arXiv, astro-ph/0405374 | | Services: | Forum | Review | PDF | Favorites | |
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