An Upper Limit on Galactic Free-Free Emission Near the North Celestial Pole

Details An Upper Limit on Galactic Free-Free Emission Near the North Celestial Pole An Upper Limit on Galactic Free-Free Emission Near the North Celestial Pole

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.0806g&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #08.06; Bulletin of the American Astronomical Society, Vol. 27, p.823

Astronomy and Astrophysics

Astrophysics

5

Scientific paper

We have observed several 7deg times 7deg fields at +84deg declination with a wide-angle CCD camera and narrow-band (1 nm) H-alpha filter. After subtracting the stellar background using offband images and smoothing to 0.1deg resolution, we set an upper limit on fluctuations in the Hα emission at this angular scale of 0.7 Rayleigh, which corresponds to fluctuations in the brightness temperature of the free-free emission at 30 GHZ of 4 mu K. Thus the microwave background fluctuations of 44 mu K at 1deg angular scale reported by Netterfield et al. (1995) are probably not significantly contaminated by Galactic free-free emission. This work was supported in part by the Fund for Astrophysical Research, the Keck Foundation, the AAS-REU program, and Swarthmore College.

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