The CMB power spectrum out to l=1400 measured by the VSA

Details The CMB power spectrum out to l=1400 measured by the VSA The CMB power spectrum out to l=1400 measured by the VSA

2002-12-20

arxiv.org/abs/astro-ph/0212495v2

Mon.Not.Roy.Astron.Soc. 341 (2003) L23

Astronomy and Astrophysics

Astrophysics

6 pages with 5 figures, MNRAS in press (minor corrections)

Scientific paper

10.1046/j.1365-8711.2003.06563.x

We have observed the cosmic microwave background (CMB) in three regions of sky using the Very Small Array (VSA) in an extended configuration with antennas of beamwidth 2 degrees at 34 GHz. Combined with data from previous VSA observations using a more compact array with larger beamwidth, we measure the power spectrum of the primordial CMB anisotropies between angular multipoles l = 160 - 1400. Such measurements at high l are vital for breaking degeneracies in parameter estimation from the CMB power spectrum and other cosmological data. The power spectrum clearly resolves the first three acoustic peaks, shows the expected fall off in power at high l and starts to constrain the position and height of a fourth peak.

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