Secondary CMB Anisotropy Measurements With the SZA

Details Secondary CMB Anisotropy Measurements With the SZA Secondary CMB Anisotropy Measurements With the SZA

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21111003s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #110.03; Bulletin of the American Astronomical Society, Vol. 39, p.939

Astronomy and Astrophysics

Astronomy

Scientific paper

We present measurements of small-scale Cosmic Microwave Background anisotropy made with the Sunyaev Zel'dovich Array (SZA). On scales of several arcminutes, the primary CMB is damped by photon diffusion, and the power spectrum is expected to be dominated by secondary contributions, especially the Sunyaev Zel'dovich Effect of galaxy clusters. The level of power on these scales is extremely sensitive to the value of σ8, the normalization of the matter power spectrum. Previous, low-confidence measurements have indicated possible excess power over what consensus cosmologies would predict.
The SZA is an eight-element array of 3.5m diameter telescopes located in the Owens Valley of California. The interferometer is outfitted with low-noise HEMT amplifier receivers operating from 26 to 36 GHz.
The small antenna diameters of the SZA allow for close-packed configurations with sensitivity to scales as large as 5 arcminutes at 30 GHz, making it an ideal instrument with which to measure the level of CMB power on these scales. Six of the SZA antennas are arranged in a compact configuration with separations ranging from 4.5 to 11.5m, yielding high brightness sensitivity for the detection of contributions to the CMB power spectrum from the SZ effect in clusters. Two outer telescopes yield baselines of up to 65m to facilitate simultaneous detection of contaminating compact sources at a resolution of 0.3 arcseconds at 30 GHz, and 8 GHz observations at the Very Large Array helped to further constrain this source of contamination.
In this talk, we present the observations targeting CMB anisotropies and current results.

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