CMB Anisotropies with the SZA

Details CMB Anisotropies with the SZA CMB Anisotropies with the SZA

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.4902s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #49.02; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

The Sunyaev-Zel'dovich Array (SZA) is a new, eight-element, interferometric array dedicated to observations of the CMB anisotropy at arcminute scales and the Sunyaev-Zel'dovich (SZ) effect from galaxy clusters. The SZA has been operating at 30 GHz at the Owens Valley Radio Observatory since mid 2005. During this first year of operation, the SZA has focused on an SZ survey for galaxy clusters over several square degrees and measurement of the CMB angular power spectrum over multipoles spanning 2000 to 8000.
On arcminute angular scales, the anisotropy in the CMB is dominated by secondary contributions, including the Sunyaev Zel'dovich effect of galaxy clusters. The magnitude of these contributions is strongly dependent on the value of sigma_8. Measurements showing power attributed to secondary CMB anisotropy have been reported by the CBI team at l 2500 (Readhead, 2003) and by the BIMA team at l 5000 (Dawson, 2006), and the SZA measurement will build on this earlier work.
Observations of several fields have now been completed by the SZA with sufficient depth to tightly constrain the power spectrum in this regime. The data have been taken in such a way as to allow the removal of contamination from the ground. Follow-up work with the VLA provides a detailed understanding of the contribution of point sources to the measurement. Jackknife tests have been used to demonstrate that measured power is coherent and persistent over months, consistent with CMB anisotropy.
After a brief review of the current status of the instrument and observations, this talk will focus on the measurements of the CMB anisotropy power.

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