Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.5003h&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #50.03; Bulletin of the American Astronomical Society, Vol. 29, p.1294
Other
Scientific paper
The Wisconsin Hα Mapper (WHAM) has been surveying the northern sky in Hα from Kitt Peak, Arizona since January 1997. Using a high-throughput, 15-cm diameter double-etalon Fabry-Perot spectrometer and a sensitive CCD detector, the WHAM survey provides the first calibrated, velocity-resolved map of Hα emission in our Galaxy. The WHAM survey data have one-degree angular resolution, 12 km s(-1) velocity resolution, a 200 km s(-1) velocity range (typically centered near the Local Standard of Rest), and are sensitive down to 0.1 R (EM ~ 0.2 cm(-6) pc). Remote operation and semi-automated procedures allow extremely efficient observations, averaging over 100 spectra per hour. The WHAM survey finally allows detailed comparisons of the Warm Ionized Medium to the other major components of the interstellar medium that have been previously surveyed. With over 85% of the sky above delta = -20arcdeg completed after the first year, we present selected regions of this new view of ionized gas in the Galaxy. A fresh look at well-studied regions examines the Orion-Eridanus complex and the X-ray bright Monogem Ring supernova remnant. Complex networks of faint, ionized filaments dominate this region of the sky and include an impressive, faint (1--2 R), ~ 50arcdeg -long, 2arcdeg wide vertical filament extending upwards perpendicular to the Galactic plane near l = 225arcdeg . This work is supported by the National Science Foundation.
Haffner Matthew L.
Jaehnig Kurt P.
Percival Will J.
Reynolds Ron J.
Tufte Stephen Louis
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