A search for the Sunyaev-Zeldovich effect at millimetre wavelengths

Details A search for the Sunyaev-Zeldovich effect at millimetre wavelengths A search for the Sunyaev-Zeldovich effect at millimetre wavelengths

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..171c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 1, 1987, p. 171-185.

Astronomy and Astrophysics

Astronomy

15

Background Radiation, Cosmic Rays, Galactic Clusters, Millimeter Waves, Signal Distortion, Spectral Energy Distribution, Astronomical Spectroscopy, Compton Effect, Cosmic Plasma, Jeans Theory, Rayleigh Scattering

Scientific paper

The Sunyaev-Zeldovich effect is potentially a powerful tool for observational cosmology. The results of the first attempt to detect this small effect at a wavelength of 1.15 mm are reported. At this wavelength, the effect has a sign opposite to that at the longer wavelengths previously employed in such studies. Observational data on two clusters, 0016 + 16 and Abell 478, are described. Particular attention has been devoted to the position-dependent offsets which are characteristic of these observations. The spurious systematic contribution such an offset adds to the Sunyaev-Zeldovich signal are analyzed, and it is demonstrated that, provided that chopping and nodding are performed in hour angle, this contribution can be precisely measured from the baseline drift. These analytical techniques have been applied to 16 hr of observational data on these two clusters. A marginal detection of the effect corresponding to a temperature decrement in the Rayleigh-Jeans region of Delta T(RJ) = -1.6 + or - 1.0 mK for the cluster 0016 + 16 and an upper limit of Delta T(RJ) = -0.2 + or - 1.0 mK for the cluster Abell 478 are achieved.

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