Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop...45m&link_type=abstract
NOAO Proposal ID #2001B-0045
Physics
Scientific paper
We propose to obtain high resolution observations of the interstellar Na I absorption toward the central 73 arcsec x 121 arcsec of the Andromeda Galaxy (M31) and the core of its nearby (24.3 arcmin separation) satellite galaxy M32 utilizing the 4 arcsec spatial resolution and 27 arcsec x 43 arcsec field of the DensePak array on the WIYN telescope. Recent observations with this instrumentation have revealed that the interstellar clouds toward the globular clusters M15 and M92 exhibit significant small-scale Na I structure. Although the M15 and M92 cloud maps are similar in terms of their smallest-scale variations, the M92 clouds do not exhibit the larger-scale, higher-amplitude structure characteristic of the M15 clouds. M31 provides a unique opportunity to further study such patterns in that its surface brightness is high enough to afford DensePak coverage of an area that is 9 times greater than that of our previous M15 and M92 observations. Such coverage will afford an examination of the Na I structure over a wider range in scale and may allow us to better distinguish the contributions of turbulence and actual H I structure to the observed Na I variations.
Andrews Sean M.
Lauroesch James Thomas
Meyer David M.
Roth Katherine C.
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