NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A measurement of the medium-scale anisotropy in the cosmic microwave background radiationObservations from the first flight of the Medium Scale Anisotropy Measurement (MSAM) are analyzed to place limits on Gaussian fluctuations in the cosmic microwave background radiation (CMBR). This instrument chops a 30 min beam in a three-position pattern with a throw of +/- 40 min; the resulting data is analyzed in statistically independent single- and double-difference sets. We observe in four spectral channels at 5.6, 9.0, 16.5, and 22.5/cm, allowing the separation of interstellar dust emission from CMBR fluctuations. The dust component is correlated with the IRAS 100 micron map. The CMBR component has two regions where the signature of an unresolved source is seen. Rejecting these two source regions, we obtain a detection of fluctuations which match CMBR in our spectral bands of 0.6 x 10(exp -5) is less than Delta (T)/T is less than 2.2 x 10(exp -5) (90% CL interval) for total rms Gaussian fluctuations with correlation angle 0.5 deg, using the single-difference demodulation. Fore the double difference demodulation, the result is 1.1 x 10(exp -5) is less than Delta(T)/T is less than 3.1 x 10(exp -5) (90% CL interval) at a correlation angle of 0.3 deg.
Document ID
19950036128
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cheng, E. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cottingham, D. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fixsen, D. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Inman, C. A.
(MIT, Cambridge, MA United States)
Kowitt, M. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meyer, S. S.
(MIT, Cambridge, MA United States)
Page, L. A.
(Princeton Univ. Princeton, NJ, United States)
Puchalla, J. L.
(MIT, Cambridge, MA United States)
Silverberg, R. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
February 20, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 422
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NGT-50908
CONTRACT_GRANT: NAGW-1841
CONTRACT_GRANT: NGT-50720
PROJECT: RTOP 188-44
Distribution Limits
Public
Copyright
Other
No Preview Available