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C. T. Liu (City Univ. of New York/College of Staten Island), T. A. D. Paglione (City Univ. of New York/York College), S. Tribiano (City Univ. of New York/BMCC), N. D. Tyson (AMNH), COSMOS Collaboration
We present the luminosity function (LF) of starburst galaxies with redshift z < 0.3, using a sample of 12,785 strongly star-forming (spectral type Sc or bluer) galaxies with robust photometric redshift measurements from the COSMOS two square degree survey. We use a modified maximum likelihood method to account for uncertainty in the photometric redshifts, and employ a bootstrapping technique to account for any systematic errors introduced. The LF is characterized by a Schechter function with a very steep faint end slope of \alpha = -1.8 +/- 0.1 for the redshift bin 0.02 < z < 0.15 down to M(v) = -13, and for 0.15 < z < 0.30 down to M(v) = -15. We characterize the morphology distribution of faint starburst galaxies in this low redshift range, in terms of the fraction of compact (nucleated), irregular, and low surface-brightness galaxies respectively.
We gratefully acknowledge support from NASA via grant HST-GO-09822 to the City University of New York, and from the City University of New York CIRG grant program.
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The author(s) of this abstract have provided an email address for comments about the abstract: cliu@mail.csi.cuny.edu
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.