Microwave Emission at High Galactic Latitudes

Details Microwave Emission at High Galactic Latitudes Microwave Emission at High Galactic Latitudes

1996-01-12

arxiv.org/abs/astro-ph/9601060v1

Astrophys.J.464:L5-L9,1996

Astronomy and Astrophysics

Astrophysics

14 pages including 2 encapsulated color figures. Submitted to The Astrophysical Journal (Letters)

Scientific paper

10.1086/310072

We use the COBE Differential Microwave Radiometers (DMR) 4-year sky maps to model Galactic microwave emission at high latitudes (|b| > 20 deg). Cross-correlation of the DMR maps with Galactic template maps detects fluctuations in the high-latitude microwave sky brightness with the angular variation of the DIRBE far-infrared dust maps and a frequency dependence consistent with a superposition of dust and free-free emission. We find no significant correlations between the DMR maps and various synchrotron templates. On the largest angular scales (e.g., quadrupole), Galactic emission is comparable in amplitude to the anisotropy in the cosmic microwave background (CMB). The CMB quadrupole amplitude, after correction for Galactic emission, has amplitude $Q_{rms}$ = 10.7 uK with random uncertainty 3.6 uK and systematic uncertainty 7.1 uK from uncertainty in our knowledge of Galactic microwave emission.

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