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Title:
High-Latitude Galactic Emission in the COBE Differential Microwave Radiometer 2 Year Sky Maps
Authors:
Kogut, A.; Banday, A. J.; Bennett, C. L.; Gorski, K. M.; Hinshaw, G.; Reach, W. T.
Publication:
Astrophysical Journal v.460, p.1 (ApJ Homepage)
Publication Date:
03/1996
Origin:
APJ
Astronomy Keywords:
COSMOLOGY: COSMIC MICROWAVE BACKGROUND, ISM: DUST, EXTINCTION, RADIO CONTINUUM: ISM
DOI:
10.1086/176947
Bibliographic Code:
1996ApJ...460....1K

Abstract

We cross-correlate the COBE6 DMR 2 year sky maps with spatial templates from long-wavelength radio surveys and the far-infrared COBE DIRBE maps. We place an upper limit on the spectral index of synchrotron radiation betasynch < -2.9 between 408 MHz and 31.5 GHz. We obtain a statistically significant cross-correlation with the DIRBE maps, whose dependence on the DMR frequencies indicates a superposition of dust and free-free emission. The high-latitude dust emission (|b| > 30°) is well fitted by a single dust component with temperature T = 18+3-7 K and emissivity nu ∝ (upsilo/nu0)beta with beta = 1.9+3.0-0.5. The free-free emission is spatially correlated with the dust on angular scales larger than the 70 DMR beam, with rms variations 5.3±1.8 muK at 53 GHz and angular power spectrum p ∝ l-3. If this correlation persists to smaller angular scales, free-free emission should not be a significant contaminant to measurements of the cosmic microwave anisotropy at degree angular scales for frequencies above 20 GHz.

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