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First Intrinsic Anisotropy Observations with the Cosmic Background Imager | | S. Padin
; J. K. Cartwright
; B. S. Mason
; T. J. Pearson
; A. C. S. Readhead
; M. C. Shepherd
; J. Sievers
; P. S. Udomprasert
; W. L. Holzapfel
; S. T. Myers
; J. E. Carlstrom
; E. M. Leitch
; M. Joy
; L. Bronfman
; J. May
; | | Date: |
11 Dec 2000 | | Journal: | 2001, ApJ, 549, L1-L5 | | Subject: | astro-ph | | Affiliation: | Caltech), W. L. Holzapfel (UC Berkeley), S. T. Myers (NRAO), J. E. Carlstrom, E. M. Leitch (U. Chicago), M. Joy (NASA/Marshall), L. Bronfman, J. May (U. de Chile | | Abstract: | 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). | | Source: | arXiv, astro-ph/0012211 | | Services: | Forum | Review | PDF | Favorites | |
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