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Degree-scale anisotropy in the cosmic microwave background: SP94 resultsWe present results from two observations of the cosmic microwave background (CMB) performed from the South Pole during the 1993-1994 austral summer. Each observation employed a 3 deg peak-to-peak sinusoidal, single-difference chop and consisted of a 20 deg x 1 deg strip on the sky. The first observation used a receiver which operates in three channels between 38 and 45 GHz (Q-band) with a full width half maximum (FWHM) beam which varies from 1 deg to 1.15 deg. The second observation overlapped the first observation and used a receiver which operates in four channels between 26 and 36 GHz (Ka-band) with a FWHM beam which varies from 1.5 deg to 1.7 deg. Significant correlated structure is observed in all channels for each observation. The spectrum of the structure is consistent with a CMB spectrum and is formally inconsistent with diffuse synchrotron and free-free emission at the 5 sigma level. The amplitude of the structure is inconsistent with 20 K interstellar dust; however, the data do not discriminate against flat or inverted spectrum point sources. The root mean square amplitude (+/- 1 sigma) of the combined (Ka + Q) data is Delta T(sub rms) = 41.2(sup +15.5, sub -6.7) micro-K for an average window function which has a peak value of 0.97 at l = 68 and drops to e(exp -0.5) of the peak value at l = 36 and l = 106. A band power estimate of the CMB power spectrum, C(sub l), gives average value of (C(sub l)l(l + 1)/(2 pi))(sub B) = 1.77(sup +1.58, sub -0.54) x 10(exp -10).
Document ID
19950050028
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gundersen, J. O.
(University of California, Santa Barbara, CA United States)
Lim, M.
(University of California, Santa Barbara, CA United States)
Staren, J.
(University of California, Santa Barbara, CA United States)
Wuensche, C. A.
(Instituto Nacional de Pesquisas Espaciais Sao Paulo, Brazil)
Figueiredo, N.
(University of California, Santa Barbara, CA United States)
Gaier, T. C.
(University of California, Santa Barbara, CA United States)
Koch, T.
(Jet Propulsion Laboratory, California Inst. of Tech., Pasadena, CA United States)
Meinhold, P. R.
(University of California, Santa Barbara, CA United States)
Seiffert, M. D.
(University of California, Santa Barbara, CA United States)
Cook, G.
(University of California, Santa Barbara, CA United States)
Date Acquired
August 16, 2013
Publication Date
April 20, 1995
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 443
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A81627
Funding Number(s)
CONTRACT_GRANT: NSF AST-91-20005
CONTRACT_GRANT: NSF OPP-92-21468
Distribution Limits
Public
Copyright
Other

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