Galactic H alpha emission and the Cosmic Microwave Background

Details Galactic H alpha emission and the Cosmic Microwave Background Galactic H alpha emission and the Cosmic Microwave Background

1998-09-15

arxiv.org/abs/astro-ph/9809189v1

Astron.Astrophys.338:1-7,1998

Astronomy and Astrophysics

Astrophysics

12 LaTex pages, 4 figures, accepted by Astronomy and Astrophysics (submitted 15 may 1998 accepted 24 june 1998)

Scientific paper

We present observations of Galactic H alpha emission along two declination bands where the South Pole cosmic microwave background experiment reports temperature fluctuations. The high spectral resolution of our Fabry-Perot system allows us to separate the Galactic signal from the much larger local sources of H alpha emission, such as the Earth's geocorona. For the two bands (at declination -62 and -63 degrees), we find a total mean emission of about 1 Rayleigh with variations of about 0.3 R. The variations are within the estimated uncertainty of our total intensity determinations. For an ionized gas at T around 10**4 K, this corresponds to a maximum free-free brightness temperature of less than 10 microK at 30 GHz (K-band). Thus, unless there is a hot gas component with T around 10**6 K, our results imply that there is essentially no free-free contamination of the SP91 (Schuster et al. 1993) and SP94 (Gunderson et al.1995) data sets.

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