Other
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..nws.b1001t&link_type=abstract
American Physical Soceity, Fifth Annual Meeting of the Northwest Section Meeting, May 30-31, 2003, Reed college, Portland, Orego
Other
Scientific paper
The Wisconsin H-Alpha Mapper (WHAM) is a unique new facility for the detection and study of faint optical emission lines from diffuse ionized gas in the disk and halo of the Galaxy. The WHAM instrument has conducted a survey of the northern sky in the Balmer α line of hydrogen (a.k.a. Hα). With one-degree spatial resolution, 12 km s-1 velocity resolution, and sensitivity to features as faint as 0.1 R (EM ≃ 0.2 cm-6 pc), the new survey provides the deepest maps of the ionized content of the Galaxy to date. This new information complements the existing maps of the neutral hydrogen provided by 21-cm line surveys carried out by radio telescopes. Beyond the Hα survey, the WHAM instrument is now measuring many other emission lines, including forbidden lines such as [N II] λ6584, [S II] λ6716, [O III] λ5007, and [O I] λ6300. This data is providing detailed information on the physical conditions in the diffuse ionized portion of the interstellar medium, including the temperature, degree of turbulence, ionization fraction, and the strength and spectrum of the ionizing radiation field. We are also exploring the ionized portions of high-velocity clouds, adding insights into their origin and nature, as well as probing the conditions of their environment in the Galactic halo.
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