We present a catalog of large-angular size (radius>0.25 deg) ionized nebula detected as part of the WHAM-SS (Wisconsin H-alpha Mapper Sky Survey). Starting with the the combined H-alpha surveys of WHAM, SHASSA (Southern H-alpha Sky Survey Atlas), and VTSS (Virginia Tech Spectral Survey), we identified 758 nebula candidates for follow-up study; 105 of these were not previously cataloged. From this list, we selected all nebulae larger than 0.25 degree that contained the center of a WHAM (one-degree) beam. We present the H-alpha Dopper shift velocities, H-alpha line-widths, nebular emission measures, and when possible the [S II]/H alpha ratio for each of these objects and compare them to typical Galactic HII regions and the diffuse warm ionized medium. Using kinematic distances, we also examing the size and spatial distribution of these sources and compare our results to recent catalogs of Galactic HII regions.
American Astronomical Society Meeting Abstracts #227
- Pub Date:
- January 2016