# Measurement of the Hubble Constant from X-ray and 2.1 mm Observations of Abell 2163

Source: [Measurement of the Hubble Constant from X-ray and 2.1 mm Observations of Abell 2163](<https://www.sota2.com/research/paper/68fa244f2c2a3760193a26be>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T09:03:37.711Z

Authors: W. L. Holzapfel, M. Arnaud, P. A. R. Ade, S. E. Church, M. L. Fischer, P. D. Mauskopf, Y. Rephaeli, T. M. Wilbanks, A. E. Lange

Published: 1997-02-26T02:18:51.000Z

## Abstract

We report 2.1 mm observations of the Sunyaev-Zel'dovich (S-Z) effect; these observations confirm our previous detection of a decrement in the Cosmic Microwave Background intensity towards the cluster Abell 2163. The S-Z data are analyzed using the relativistically correct expression for the Comptonization. We begin by assuming the intracluster (IC) gas to be isothermal at the emission weighted average temperature determined by a combined analysis of the ASCA and GINGA X-ray satellite observations. Combining the X-ray and S-Z measurements, we determine the Hubble constant to be H\_0(q\_0=0.5)= 60 +40/-23 km/s/Mpc, where the uncertainty is dominated by the systematic difference in the ASCA and GINGA determined IC gas temperatures. ASCA observations suggest the presence of a significant thermal gradient in the IC gas. We determine $H\_0$ as a function of the assumed IC gas thermal structure. Using the ASCA determined thermal structure and keeping the emission weighted average temperature the same as in the isothermal case, we find H\_0(q\_0=0.5)= 78 +54/-28 km/s/Mpc. Including additional uncertainties due to cluster asphericity, peculiar velocity, IC gas clumping, and astrophysical confusion, we find H\_0(q\_0=0.5)= 78 +60/-40 km/s/Mpc.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/astro-ph/9702224>)

[PDF](<https://arxiv.org/pdf/astro-ph/9702224.pdf>)