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J.H Kim, S.S. McGaugh (Univ. of Maryland, College Park)
We present preliminary result from the project to measure the current and the time-averaged star formation rate in low surface brightness galaxies in order to constrain their star formation histories. This is important because the star formation history of LSBGs are poorly constrained and these galaxies show very different characteristics of star formation history in terms of their stellar populations, the current star formation rates, total stellar mass, etc. from high surface brightness galaxies. We have obtained near-infrared broad-band photometry (especially , the K' band) and H\alpha photometry of a large sample of LSBGs (~45). H\alpha emission provides a fairly robust quantitative measure of its current rate (\dot Mo). The total stellar mass (M*) of a galaxy is most closely traced by K'-band light. We also obtained complimentary optical broad-band photometry of sample galaxies to provide combinations of broad-band colors of optical and near-infrared wavelengths. We compare the galaxy colors from broad-band photometry to the colors generated by stellar population synthesis (SPS) models, which will provide insight into their stellar populations and how these relate to the stellar populations of high surface brightness galaxies.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.