Galactic Free-free Emission and H$α$
We review present understanding of Galactic free-free emission and its possible importance to CMB fluctuation measurements. Current results, from both ``direct'' observations in the microwave band and from H$α$ studies, suggest that this foreground does not represent a serious obstacle to...
| Main Authors: | , |
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| Format: | Report |
| Language: | unknown |
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arXiv
1998
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.48550/arxiv.astro-ph/9804330 https://arxiv.org/abs/astro-ph/9804330 |
| Summary: | We review present understanding of Galactic free-free emission and its possible importance to CMB fluctuation measurements. Current results, from both ``direct'' observations in the microwave band and from H$α$ studies, suggest that this foreground does not represent a serious obstacle to mapping the CMB; however, this is based on limited information and we emphasize the need for more exhaustive studies. We also present some preliminary results based on our recent H$α$ observations near the South Pole CMB data sets. The fluctuation amplitude seen in H$α$ indicates that the detected CMB fluctuations are not significantly contaminated by free-free emission, at least if the diffuse gas is at a temperature of $T\sim 10^4$ K. : To appear in ``Fundamental Parameters in Cosmology'', Moriond proceedings, January, 1998 |
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