Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1505r&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #15.05; Bulletin of the American Astronomical Society, V
Other
Scientific paper
We present high-resolution optical images of the interstellar medium (ISM) in the thick disks of the spiral galaxies NGC 4013 and NGC 4302. Our broadband (BVI) images acquired with the Hubble Space Telescope’s WFPC2 show extensive extraplanar dust clouds seen in absorption against the background stellar light, while our narrow-band H-alpha images taken with the WIYN 3.5-m telescope show the diffuse ionized gas (DIG) in these galaxies. The dusty, thick disk clouds visible in our WFPC2 images, which can be found to heights approaching 2 kpc from the midplanes of these galaxies, trace a phase of the ISM that shows significant structure on quite small scales. In general this material is seen to be highly filamentary. By contrast, the thick disk DIG in these galaxies has significantly smoother distribution. We note several unresolved knots of H-alpha emission which may represent thick disk H II regions. We discuss the relationship of the dust-bearing clouds and the DIG in these galaxies.
Hirschauer A.
Howk Christopher
Lehner Nicholas
Pitterle M.
Rueff Katherine
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