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Measurements of the millimeter-wave spectrum of interstellar dust emissionWe report measurements of the differential brightness of interstellar dust emission near the Galactic plane and at high Galactic latitudes. The data were obtained as part of a program to measure anisotropy in the cosmic microwave background (CMB). The measurements were made with a 0.5 deg beam size and a 1.3 deg sinusoidal chop, in broad bands (Delta nu/nu approximately 0.3) centered near frequencies of 6, 9, and 12 cm(exp -1). A measurement made toward the Galactic plane, at longitude 1 = 23.7 deg, is compared with the contrast observed in the 100 micrometers IRAS data. Assuming the dust emission has a brightness I(sub nu) proportional to nu(sup n)B(sub nu)(T(sub d)), where B(sub nu) is the Planck function, a best fit yields n = 1.6 +/- 0.4, T(sub d) = 24 +/- 5 K. In a region near the star mu Pegasi (mu PEG l = 91 deg, b = -31 deg), the comparison of our data with the 100 micrometers IRAS data yields n = 1.4 +/- 0.4, and T(sub d) = 18 +/- 3 K. In a second region near the star gamma Ursa Minoris (GUM l = 108 deg, b = 41 deg), an upper limit is placed on contrast in dust emission. This upper limit is consistent with spectrum measured at mu PEG and the IRAS 100 micrometer emission contrast at GUM, which is approximately 8 times lower than mu PEG.
Document ID
19950060154
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Fischer, M. L. (NSF Center for Particle Astrophysics United States)
Clapp, A. (NSF Center for Particle Astrophysics United States)
Devlin, M. (NSF Center for Particle Astrophysics United States)
Gundersen, J. O. (NSF Center for Particle Astrophysics United States)
Lange, A. E. (NSF Center for Particle Astrophysics United States)
Lubin, P. M. (NSF Center for Particle Astrophysics United States)
Meinhold, P. R. (NSF Center for Particle Astrophysics United States)
Richards, P. L. (NSF Center for Particle Astrophysics United States)
Smoot, G. F. (NSF Center for Particle Astrophysics United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1995
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 444
Issue: 1
ISSN: 0004-637X
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NAGW-2121
CONTRACT_GRANT: NAGW-1062
Distribution Limits
Public
Copyright
Other