IAU00547
Presentation type requested: ORAL
LATEST RESULTS FROM THE VSA
Anze Slosar
Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK
The Very Small Array (VSA) is a unique interferometric telescope operating at 33 GHz at Tenerife. It has the ability to measure fluctuations in the CMB over a large range of angular scales by means of three main array configurations: compact, extended and super-extended. These angular scales correspond to the multipole range l=150 - 2500. Here we present new results from further observations of the extended array (Feb. 2002 - June 2003). We cover l-values up to l=1600, thus doubling the l-range of WMAP. The resulting power spectrum in the l-range 800-1600 has very low noise coupled with the finest l-resolution to date. Furthermore, the use of independently tracking aerials along with the dedicated source subtraction baseline allows unprecendented control of systematics. The latter is essential, since discrete sources are the dominant foreground at these angular scales. These measurements over larger l-ranges are important in confirming the present cosmological paradigm and breaking degeneracies in the extraction of cosmological parameters.
The vsa collaboration
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