NOAO >   Observing Info >   Approved Programs >   2001B-0045

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Proposal Information for 2001B-0045


PI: David M. Meyer, Northwestern University, davemeyer@nwu.edu
Address: 2145 Sheridan Road, Evanston, IL 60208, USA

CoI: James T. Lauroesch, Northwestern University
CoI: Sean M. Andrews, Northwestern University
CoI: Katherine C. Roth, Gemini Observatories

Title: Mapping the Small-Scale ISM: The Andromeda Project

Abstract: 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.


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NOAO >   Observing Info >   Approved Programs >   2001B-0045

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