Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1306m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #13.06; Bulletin of the American Astronomical Society, Vol. 39, p.755
Other
Scientific paper
The HI gas and other Population I tracers in the disk of the Milky Way are known to exhibit vertical deviations from the mean plane in the form of a regular pattern of displacements or "corrugations." The origin of these corrugations has been a longstanding puzzle, and little has been known about the presence of this phenomenon in external galaxies. Using data from the Very Large Array, we have discovered the first example of a corrugated structure in the HI disk of an external galaxy: the isolated, edge-on Sd spiral IC2233. The undulations in the HI disk of IC2233 are visible as a remarkably regular pattern of positive and negative displacements with a wavelength of ˜150" (7 kpc) and an amplitude that increases with distance from the center of the galaxy, reaching a maximum of ˜3" (? pc). Using data from Spitzer and GALEX, we confirm that these corrugations also affect the dust and young stellar populations of the galaxy, but are not as readily traceable in the old stars. The isolated nature of IC2233 suggests an internal rather than external origin for the corrugations, and we will evaluate the two most likely triggers: bending instabilities and spiral arms.
Matthews Lynn Diane
Uson Juan M.
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