NOAO >   Observing Info >   Approved Programs >   2006B-0100

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Proposal Information for 2006B-0100


PI: Stacy McGaugh, University of Maryland, ssm@astro.umd.edu
Address: Department of Astronomy, Computer \& Space Sciences Bldg, College Park, MD 20742, USA

CoI: Ted von Hippel, University of Texas
CoI: Matt Bershady, University of Wisconsin
CoI: Dave Silva, AURA/TMT
CoI: Kyle Westfall, University of Wisconsin

Title: Stellar Absorption Lines in Low Surface Brightness Galaxies

Abstract: The stellar populations of low surface brightness (LSB) galaxies tend to be quite blue. This has been attributed to a variety of causes, including a late formation epoch, a great age but gradual evolution, or even a variable IMF. So far, there are few constraints other than colors, which are notoriously degenerate. To date there are no continuum spectra for LSB galaxies with central surface brightness fainter than 23 B mag/[]. What this problem requires is a highly efficient, very large aperture spectrograph. The advent of the efficient new VPH grating for the Bench Spectrograph combined with the wide area coverage afforded by SparsePak provides a golden opportunity for obtaining continuum spectroscopy of LSB galaxy disks by the appropriately weighted co-addition of individual fiber spectra. Seeing what spectral features are present would be a great step forward in constraining the stellar content of these ephemeral galaxies.


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NOAO >   Observing Info >   Approved Programs >   2006B-0100

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