The Wisconsin Htex2html_wrap_inline232 Mapper (WHAM): A Brief Review of Performance Characteristics and Early Scientific Results

R. J. Reynolds , S. L. Tufte , L. M. Haffner , K. Jaehnig , J. W. Percival, PASA, 15 (1), 14
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The Wisconsin Htex2html_wrap_inline232 Mapper (WHAM): A Brief Review of Performance Characteristics and Early Scientific Results

R. J. Reynolds tex2html_wrap_inline234
S. L. Tufte tex2html_wrap_inline234
L. M. Haffner tex2html_wrap_inline234
K. Jaehnig tex2html_wrap_inline240
J. W. Percival tex2html_wrap_inline240

tex2html_wrap_inline234 Department of Astronomy, University of Wisconsin, 475 N. Charter St., Madison, WI 53706, USA
tex2html_wrap_inline240 Space Astronomy Laboratory, University of Wisconsin, 1150 University Ave., Madison, WI 53706, USA

Abstract:

The Wisconsin Htex2html_wrap_inline232 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 provide a one degree diameter beam on the sky and produce a 12 km stex2html_wrap_inline250 resolution spectrum within a 200 km stex2html_wrap_inline250 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 Htex2html_wrap_inline232 map of a 70tex2html_wrap_inline256 region of the sky near the Galactic anticenter, the first detections of Htex2html_wrap_inline232 emission from the M I and A high velocity clouds, and the first detections of [O I] tex2html_wrap_inline2606300 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 H II through the optical Htex2html_wrap_inline232 line in a manner that is analogous to earlier sky surveys of the H I made through the 21 cm line.

Keywords: ISM: general -- ISM: H II regions -- ISM: structure -- instrumentation: spectrographs



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