The Wisconsin H-alpha Mapper (WHAM): A brief review of performance characteristics and early scientific results

Details The Wisconsin H-alpha Mapper (WHAM): A brief review of performance characteristics and early scientific results The Wisconsin H-alpha Mapper (WHAM): A brief review of performance characteristics and early scientific results

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15...14r&link_type=abstract

Publications Astronomical Society of Australia, vol. 15, no. 1, p. 14-18

Astronomy and Astrophysics

Astronomy

77

Interstellar Medium, Spectrographs

Scientific paper

The Wisconsin H-alpha Mapper (WHAM) is a recently completed facility for the detection and study of faint optical emission lines from diffuse ionized gas in the disk and halo of the Galaxy. WHAM consists of a 15 cm diameter Fabry-Perot spectrometer coupled to a 0.6 m `telescope', which provides a one degree diameter beam on the sky and produces a 12 km s^-1^ resolution spectrum within a 200 km s^-1^ spectral window. This facility is now located at Kitt Peak in Arizona and operated remotely from Madison, Wisconsin, 2400 km distant. Early results include a velocity resolved H-alpha map of a 70x100 sq. deg. region of the sky near the Galactic anticenter, the first detections of H-alpha emission from the M I and A high velocity clouds, and the first detections of [O I] lambda-6300 and other faint `diagnostic' lines from the warm ionized medium. Through the summer of 1998, WHAM will be devoted almost exclusively to a survey of the northern sky, which will provide maps of the distribution and kinematics of the diffuse HII through the optical H-alpha line in a manner that is analogous to earlier sky surveys of the HI made through the 21 cm line.

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