Galactic microwave emission at degree angular scales

Details Galactic microwave emission at degree angular scales Galactic microwave emission at degree angular scales

1997-02-20

arxiv.org/abs/astro-ph/9702172v2

ApJ Letters, 482, L17-20 (1997)

Astronomy and Astrophysics

Astrophysics

Minor revisions to match published version. 14 pages, with 2 figures included. Color figure and links at http://www.sns.ias.

Scientific paper

10.1086/310684

We cross-correlate the Saskatoon Ka and Q-Band Cosmic Microwave Background (CMB) data with different maps to quantify possible foreground contamination. We detect a marginal correlation (2 sigma) with the Diffuse Infrared Background Experiment (DIRBE) 240, 140 and 100 microm maps, but we find no significant correlation with point sources, with the Haslam 408 MHz map or with the Reich and Reich 1420 MHz map. The rms amplitude of the component correlated with DIRBE is about 20% of the CMB signal. Interpreting this component as free-free emission, this normalization agrees with that of Kogut et al. (1996a; 1996b) and supports the hypothesis that the spatial correlation between dust and warm ionized gas observed on large angular scales persists to smaller angular scales. Subtracting this contribution from the CMB data reduces the normalization of the Saskatoon power spectrum by only a few percent.

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