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2000ApJ...529..229K - Astrophys. J., 529, 229-240 (2000/January-3)
An infrared and radio study of the galactic worm GW 46.4+5.5.
KIM K.-T. and KOO B.-C.
Abstract (from CDS):
Using the Leiden-Dwingeloo H I data, we identify an expanding H I supershell associated with GW 46.4+5.5, which is centered on (l,b)≃(42°,5°) with an angular size of 14°x22° (or 340x540 pc2 at 1.4 kpc). The supershell appears between vLSR≃18 and 40 km.s–1 and slowly decreases in size as the velocity increases. An averaged position-velocity diagram reveals that the supershell has a central velocity of ∼18 km.s–1, giving a kinematic distance of 1.4 kpc and an expansion velocity of ∼15 km.s–1. Assuming that it has been created by multiple stellar winds and supernova explosions, we estimate its kinematic age and the energy required to produce it to be about 5 Myr and 1.5x1052 ergs, respectively. The structure is also visible in median-filtered radio continuum maps, but not in the ROSAT maps. The observed molecular clouds might have condensed out of shock-compressed gas in GW 46.4+5.5 because they are closely associated with the H I gas in velocity as well as in position. Their altitudes are 80 and 100 pc, respectively, higher than the scale height of the thin molecular gas disk. The physical properties of the clouds are very similar to those of the high-altitude clouds observed recently in sensitive wide-latitude CO surveys. Our results suggest that at least some of the high-altitude clouds might have formed in Galactic worms (or swept-up H I shells and supershells).
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Structure - ISM: Bubbles - ISM: individual (GW 46.4+5.5) - ISM: Structure - Radio Lines: ISM - ISM: Supernova Remnants
CDS comments: Table 3: KK99 1 to 5 = [KLK99] A to E.
Simbad objects: 22
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