A Determination of the Hubble Constant Using Measurements of X-Ray Emission and the Sunyaev-Zeldovich Effect at Millimeter Wavelengths in the Cluster Abell 1835

Details A Determination of the Hubble Constant Using Measurements of X-Ray Emission and the Sunyaev-Zeldovich Effect at Millimeter Wavelengths in the Cluster Abell 1835 A Determination of the Hubble Constant Using Measurements of X-Ray Emission and the Sunyaev-Zeldovich Effect at Millimeter Wavelengths in the Cluster Abell 1835

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...538..505m&link_type=abstract

The Astrophysical Journal, Volume 538, Issue 2, pp. 505-516.

Astronomy and Astrophysics

Astronomy

34

Cosmology: Observations, Cosmology: Distance Scale, Galaxies: Clusters: Individual (A1835), Radio Continuum: Galaxies, X-Rays: Galaxies

Scientific paper

We present a determination of the Hubble constant and central electron density in the cluster Abell 1835 (z=0.2523) from measurements of X-ray emission and millimeter-wave observations of the Sunyaev-Zeldovich (S-Z) effect with the Sunyaev-Zeldovich Infrared Experiment (SuZIE) multifrequency array receiver. Abell 1835 is a well studied cluster in the X-ray with a large central cooling flow. Using a combination of data from ROSAT PSPC and HRI images and millimeter wave measurements we fit a King model to the emission from the ionized gas around Abell 1835 with θ0=0.22′+/-0.02′ and β=0.58+/-0.02. Assuming the cluster gas to be isothermal with a temperature of 9.8+2.3-1.3 keV, we find a y-parameter of 4.9+/-0.6×10-4 and a peculiar velocity of 500+/-1000 km s-1 from measurements at three frequencies, 145, 221, and 279 GHz. Combining the S-Z measurements with X-ray data, we determine a value for the Hubble constant of H0=59+38-28 km s-1 Mpc-1 and a central electron density for Abell 1835 of ne0=5.64+1.61-1.02×10- 2 cm-3 assuming a standard cosmology with Ωm=1 and ΩΛ=0. The error in the determination of the Hubble constant is dominated by the uncertainty in the temperature of the X-ray emitting cluster gas.

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