Measurements of the millimeter-wave spectrum of interstellar dust emission

M. L. Fischer, A. Clapp, M. Devlin, J. O. Gundersen, A. E. Lange, P. M. Lubin, P. R. Meinhold, P. L. Richards, G. F. Smoot

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

We 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 beam size and a 1°.3 p-p sinusoidal chop, in broad bands (Δv/v ∼ 0.3) centered near frequencies of 6, 9, and 12 cm-1. A measurement made toward the Galactic plane, at longitude l = 23°7, is compared with the contrast observed in the 100 μm IRAS data. Assuming the dust emission has a brightness Iv ∝ VnBv(Td), where Bv is the Planck function, a best fit yields n = 1.6 ± 0.4, Td = 24 ± 5 K. In a region near the star μ Pegasi (μPEG l = 91°, b = -31°), the comparison of our data with the 100 μn IRAS data yields n = 1.4 ± 0.4, and Td = 18 ± 3 K. In a second region near the star γ Ursa Minoris (GUM 1 = 108°, b = 41°), an upper limit is placed on contrast in dust emission. This upper limit is consistent with the spectrum measured at μPEG and the IRAS 100 μm emission contrast at GUM, which is ∼8 times lower than μPEG.

Original languageEnglish (US)
Pages (from-to)226-230
Number of pages5
JournalAstrophysical Journal
Volume444
Issue number1
DOIs
StatePublished - May 1 1995
Externally publishedYes

Keywords

  • Dust, extinction
  • ISM: general
  • Radio continuum: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Fischer, M. L., Clapp, A., Devlin, M., Gundersen, J. O., Lange, A. E., Lubin, P. M., Meinhold, P. R., Richards, P. L., & Smoot, G. F. (1995). Measurements of the millimeter-wave spectrum of interstellar dust emission. Astrophysical Journal, 444(1), 226-230. https://doi.org/10.1086/175598