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The Anisotropy of the Microwave Background to l=3500: Mosaic Observations with the Cosmic Background ImagerUsing the Cosmic Background Imager, a 13-element interferometer array operating in the 26-36 GHz frequency band, we have observed 40 deg (sup 2) of sky in three pairs of fields, each approximately 145 feet x 165 feet, using overlapping pointings: (mosaicing). We present images and power spectra of the cosmic microwave background radiation in these mosaic fields. We remove ground radiation and other low-level contaminating signals by differencing matched observations of the fields in each pair. The primary foreground contamination is due to point sources (radio galaxies and quasars). We have subtracted the strongest sources from the data using higher-resolution measurements, and we have projected out the response to other sources of known position in the power-spectrum analysis. The images show features on scales approximately 6 feet-15 feet, corresponding to masses approximately 5-80 x 10(exp 14) solar mass at the surface of last scattering, which are likely to be the seeds of clusters of galaxies. The power spectrum estimates have a resolution delta l approximately 200 and are consistent with earlier results in the multipole range l approximately less than 1000. The power spectrum is detected with high signal-to-noise ratio in the range 300 approximately less than l approximately less than 1700. For 1700 approximately less than l approximately less than 3000 the observations are consistent with the results from more sensitive CBI deep-field observations. The results agree with the extrapolation of cosmological models fitted to observations at lower l, and show the predicted drop at high l (the "damping tail").
Document ID
20020068003
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Pearson, T. J.
(California Inst. of Tech. Pasadena, CA United States)
Mason, B. S.
(California Inst. of Tech. Pasadena, CA United States)
Readhead, A. C. S.
(California Inst. of Tech. Pasadena, CA United States)
Shepherd, M. C.
(California Inst. of Tech. Pasadena, CA United States)
Sievers, J. L.
(California Inst. of Tech. Pasadena, CA United States)
Udomprasert, P. S.
(California Inst. of Tech. Pasadena, CA United States)
Cartwright, J. K.
(California Inst. of Tech. Pasadena, CA United States)
Farmer, A. J.
(California Inst. of Tech. Pasadena, CA United States)
Padin, S.
(California Inst. of Tech. 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
May 23, 2002
Subject Category
Space Radiation
Report/Patent Number
astro-ph/0205388-Vol-1
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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