The Wisconsin H-Alpha Mapper Northern Sky Survey of Galactic Ionized Hydrogen

Details The Wisconsin H-Alpha Mapper Northern Sky Survey of Galactic Ionized Hydrogen The Wisconsin H-Alpha Mapper Northern Sky Survey of Galactic Ionized Hydrogen

2001-12-10

arxiv.org/abs/astro-ph/0112232v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to appear in: "Seeing Through the Dust: The Detection of HI and the Exploration of the ISM in Galaxies", ed

Scientific paper

The Wisconsin H-Alpha Mapper (WHAM) has completed a one-degree resolution, velocity-resolved northern sky survey of H-alpha emission from our Galaxy. The unprecedented sensitivity of the instrument and accurate spectral subtraction of atmospheric features allow us to detect Galactic features as faint as 0.1 Rayleighs (EM ~ 0.25 cm^{-6} pc). This survey allows a direct comparison of the ionized and neutral components of the ISM on a global scale for the first time. All-sky maps of H-alpha emission in select velocity bands highlight the rich kinematic structure of the Galaxy's ionized gas. The full set of data from the WHAM survey is now available at http://www.astro.wisc.edu/wham/. (abridged)

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