HEAD Division Meeting 1999, April 1999
Session 4. Clusters of Galaxies
Poster, Monday, April 12, 1999, 8:30am-6:10pm, Gold Room

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[4.04] A Hubble Constant Estimate from X-ray Observations and Sunyaev-Zel'dovich Effect Measurements towards Abell 1995

S. K. Patel (U. of Alabama in Huntsville), M. Joy (NASA/MSFC), J. Carlstrom (U. of Chicago), L. Grego (Harvard-CfA/U. Chicago), J. P. Hughes (Rutgers U.), E. Reese, G. Holder, J. Mohr (U. of Chicago)

We report the analysis and results of our interferometric imaging of the Sunyaev Zel'dovich (SZ) effect in Abell 1995 as observed by by the Hat Creek and Owens Valley millimeter interferometers outfitted with 30GHz recievers. We also present our analysis of the 37 ksec ROSAT HRI observation of this cluster. Assuming a spherical geometry for the cluster gas we are able to combine the X-ray observation and the SZ measurement towards Abell 1995 to determine its distance, and hence an estimate of the Hubble constant. The ROSAT HRI X-ray data can be described by an isothermal beta model with beta = 0.64 and core radius = 0.53'. We will present the distance determined from the SZ and X-ray data, assess the statistical and systematic uncertainties, and discuss the the improvement expected from the upcoming 48 ksec Chandra x-ray observation of Abell 1995.


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