Measurement of the Sunyaev-Zel'dovich effect toward Abell 2163 at a wavelength of 2.2 millimeters

Details Measurement of the Sunyaev-Zel'dovich effect toward Abell 2163 at a wavelength of 2.2 millimeters Measurement of the Sunyaev-Zel'dovich effect toward Abell 2163 at a wavelength of 2.2 millimeters

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l..75w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 427, no. 2, p. L75-L78

Astronomy and Astrophysics

Astrophysics

55

Background Radiation, Compton Effect, Cosmology, Galactic Clusters, Microwaves, Bolometers, Hubble Constant, Kinetics, Statistical Analysis, Temperature Effects, X Rays

Scientific paper

We report the first significnat detection of the Sunyaev-Zel'dovich (S-Z) effect at millimeter wavelengths. Drift scans of the cluster of galaxies Abell 2163 were performed using a novel bolometric array receiver at a wavelength of 2.2 millimeters. The measured decrement in sky brightness corresponds to a peak Comptonization of the cosmic microwave background radiation at the cluster of center y = (3.78-0.65+0.74) x 10-4. Measurements at millimeter wavelengths are necessary to separate the thermal and kinetic S-Z effects. The value of the Hubble constant can be derived from the amplitude of the thermal effect in combination with the measured X-ray properties of the cluster. The radial peculiar velocity of the cluster relative to its local cosmic microwave background (CMB) rest frame can be derived from the relative amplitude of the kinetic and thermal effects and the X-ray temperature.

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