First Intrinsic Anisotropy Observations with the Cosmic Background Imager

Details First Intrinsic Anisotropy Observations with the Cosmic Background Imager First Intrinsic Anisotropy Observations with the Cosmic Background Imager

2000-12-11

arxiv.org/abs/astro-ph/0012211v2

2001, ApJ, 549, L1-L5

Astronomy and Astrophysics

Astrophysics

5 pages including 2 figures. Corrected an error in the comparison with Boomerang and Maxima

Scientific paper

10.1086/319142

We present the first results of observations of the intrinsic anisotropy of the cosmic microwave background radiation with the Cosmic Background Imager from a site at 5080 m altitude in northern Chile. Our observations show a sharp decrease in C_l in the range l=400 - 1500. The broadband amplitudes we have measured are deltaT(band) = 58.7 (-6.3, +7.7) microK for l = 603 (-166, +180) and 29.7 (-4.2, +4.8) microK for l = 1190 (-224, +261), where these are half-power widths in l. Such a decrease in power at high l is one of the fundamental predictions of the standard cosmological model, and these are the first observations which cover a broad enough l range to show this decrease in a single experiment. The C_l we have measured enable us to place limits on the density parameter, Omega(tot) <= 0.4 or $Omega(tot) >= 0.7 (90% confidence).

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