Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8166w&link_type=abstract
HST Proposal ID #8166
Other
Hst Proposal Id #8166 Galaxy Structure And Dynamics
Scientific paper
Observations of nearby edge-on disk galaxies are essential to determine the role that the disk/halo interaction has in galaxy evolution. Located in a direction of exceptionally low Galactic extinction, NGC4631 is particularly suitable for a multi-wavelength investigation of extra-planar gas components. In fact, NGC4631 is one of the most well studied late-type disk galaxies. Broad-band optical, near-infrared, near-UV, and far-UV observations have been {or will be} taken with HST and FUSE. We have obtained AXAF observing time to conduct a spatially-resolved X-ray spectroscopic observation of the galaxy. Here we propose for HST WFPC2 narrow-band H-alpha imaging of the galaxy's active central region. This image will enable us to resolve various narrow filaments of warm ionized gas that extend more than 2 kpc away from the mid-plane of the galaxy. Based on the geometry, filling factor and line intensity of the filaments and their correlation with X-ray- emitting gas, we will stu dy their origins {chimney walls, b listers, condensations of cooled hot gas, shocks, etc}. The results will be invaluable for our understanding of similar extra-planar gas observed in the Milky Way and other galaxies.
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