Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.4309h&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #43.09; Bulletin of the American Astronomical Society, Vol. 28, p.890
Astronomy and Astrophysics
Astronomy
Scientific paper
Utilizing a large-aperture, double-etalon Fabry-Perot and modern CCD technology, the Wisconsin Hα Mapper (WHAM) attains unprecedented sensitivity at 10 km s(-1) resolution for faint emission line studies. Starting this fall, WHAM will begin mapping the northern sky in Hα from Kitt Peak. We present two sets of data on ionized gas in our Galaxy taken during the instrument's testing and development phase at Pine Bluff Observatory in Wisconsin. First, we discuss a sensitive search for an [O iii] lambda 5007 counterpart to the high-latitude O iii] lambda 1663 emission detected by Martin & Bowyer (1990, ApJ, 350, 242). In directions where they find evidence for O iii] lambda 1663 emission, simple, single-temperature (T ~ 10(5) K) gas calculations suggest I5007 ~ 0.1--0.2 R. A complex multi-temperature model such as turbulent mixing layers predicts I5007 to be 3--30 times greater. With these predictions in mind, we discuss our new Fabry-Perot observations of [O iii] lambda 5007. Second, we discuss a search for Hα emission from high-velocity clouds in the vicinity of Mrk 509. Sembach et al. (1995, ApJ, 451, 616) report the discovery of a highly ionized component of these clouds seen through UV absorption lines toward Mrk 509. An intensity gradient in high velocity H i 21 cm emission near the line of sight suggests a cloud boundary or transition region. We compare our new observations in Hα to H i measurements in the region to determine the spatial ionization characteristics of these clouds in light of the highly ionized gas present toward Mrk 509. This work has been supported by the National Science Foundation.
Haffner Matthew L.
Reynolds Ron J.
Tufte Stephen Louis
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