Translational anisotropy in the cosmic microwave background radiation and far-infrared emission by galactic dust clouds.
Abstract
The predicted emission spectrum of galactic dust at about 10 K is compared with the spectrum of 2.8-K universal blackbody radiation and with the spectrum of the anisotropy expected in the 2.8-K radiation due to motion of earth with respect to the coordinate system in which the radiation was last scattered. The extremely anisotropic galactic-dust emission spectrum may contribute a significant background to anisotropy measurements which scan through the galactic plane. The contamination would appear in an 8-mm scan around the celestial equator, for example, as a spurious 200 km/s velocity toward declination 0 deg, right ascension 19 hr, if predictions are correct. The predicted spectrum of dust emission in the galactic plane at longitudes not exceeding about 30 deg falls below the total 2.8-K cosmic background intensity at wavelengths of at least 1 mm.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1977
- DOI:
- 10.1086/182361
- Bibcode:
- 1977ApJ...212L...1F
- Keywords:
-
- Background Radiation;
- Cosmic Dust;
- Emission Spectra;
- Far Infrared Radiation;
- Interstellar Matter;
- Microwave Emission;
- Absorption Spectra;
- Anisotropy;
- Black Body Radiation;
- Galactic Structure;
- Infrared Astronomy;
- Radio Astronomy;
- Temperature Distribution;
- Translational Motion;
- Astrophysics