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The Anisotropy of the Microwave Background to l = 3500: Deep Field Observations with the Cosmic Background ImagerWe report measurements of anisotropy in the cosmic microwave background radiation over the multipole range l approximately 200 (right arrow) 3500 with the Cosmic Background Imager based on deep observations of three fields. These results confirm the drop in power with increasing l first reported in earlier measurements with this instrument, and extend the observations of this decline in power out to l approximately 2000. The decline in power is consistent with the predicted damping of primary anisotropies. At larger multipoles, l = 2000-3500, the power is 3.1 sigma greater than standard models for intrinsic microwave background anisotropy in this multipole range, and 3.5 sigma greater than zero. This excess power is not consistent with expected levels of residual radio source contamination but, for sigma 8 is approximately greater than 1, is consistent with predicted levels due to a secondary Sunyaev-Zeldovich anisotropy. Further observations are necessary to confirm the level of this excess and, if confirmed, determine its origin.
Document ID
20020067736
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Mason, B. S.
(Owens Valley Radio Observatory Pasadena, CA United States)
Pearson, T. J.
(Owens Valley Radio Observatory Pasadena, CA United States)
Readhead, A. C. S.
(Owens Valley Radio Observatory Pasadena, CA United States)
Shepherd, M. C.
(Owens Valley Radio Observatory Pasadena, CA United States)
Sievers, J.
(Owens Valley Radio Observatory Pasadena, CA United States)
Udomprasert, P. S.
(Owens Valley Radio Observatory Pasadena, CA United States)
Cartwright, J. K.
(Owens Valley Radio Observatory Pasadena, CA United States)
Farmer, A. J.
(Owens Valley Radio Observatory Pasadena, CA United States)
Padin, S.
(Owens Valley Radio Observatory Pasadena, CA United States)
Myers, S. T.
(National Radio Astronomy Observatory Socorro, NM United States)
Six, N. Frank
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Astrophysics
Report/Patent Number
astro-ph/0205384-Vol-1
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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