Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21442504s&link_type=abstract
American Astronomical Society, AAS Meeting #214, #425.04; Bulletin of the American Astronomical Society, Vol. 41, p.694
Other
Scientific paper
The Galactic interstellar medium (ISM) exhibits a complex set of interacting structures driven by stellar winds and supernova explosions. Shells and other features are evidence of how energy and matter released by stars are redistributed throughout the Universe, resulting in the formation of new generations of stars. Models of the ISM remain incomplete, but detailed study of the interactions of particular supernova remnants with their environment will improve our understanding of the overall processes in the ISM. Specifically, observing expanding shells of supernova remnants at various wavelengths gives us a picture of the gas at various temperatures and physical conditions.
The first step is identifying neutral hydrogen (HI) shells which have been previously neglected. Older shells exhibiting little expansion or with broken outlines are missed in most computer-based searches. The human eye is better at searching for such large, irregular features. We have examined the SETHI database, searching for shell-like structures. This is a particularly rich resource (angular resolution 0.03°, velocity resolution 1.5 km/s) not yet utilized to its full potential. We present the current status of our search for shells.
We also present a high resolution H-α map of one shell found this way, and compare to the HI data. Data of the shell at (l,b) (56. 5°, -5.5°) were taken at the Kitt Peak National Observatory using the WIYN 0.9-m telescope utilizing the MOSAIC camera. Individual images were corrected for instrumental effects and stacked into a single map of ionized hydrogen in the shell. In general, H-α emissions are strongest in the regions where there exist gaps in the HI wall of the shell, indicating warm gas in this region has not yet cooled.
This work has been supported by NSF grants AST/RUI-0507326, AST-0307596, and AST-0709347, Research Corporation award CC6476/6255, and a WSGC seed grant.
Baldwin Betty
Douglas K.
Grunwald K.
Korpela Eric J.
Sallmen Shauna
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