Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733533b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #335.33; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Galaxies have been historically classified based on their morphologies, requiring visual identification of their defining structural features. This can be extremely time consuming and especially difficult for galaxies that are poorly resolved or at certain orientations. To quell these issues, a new automated proxy for visual morphological classification is needed. We utilized photometric magnitudes and angular size information from the Sloan Digital Sky Survey (SDSS) and Galaxy Evolution Explorer (GALEX) data releases to categorize galaxies at redshifts near z=0.1 as elliptical, lenticular, spiral, or irregular. A galaxy of interest has its catalog photometry corrected for redshift and is then compared to galaxies of known type from the Third Reference Catalog of Bright Galaxies (RC3) by a chi-squared goodness-of-fit analysis of their spectral energy distributions, radial light concentrations, ellipticities, and UV-to-optical size ratios. Testing this method on the RC3 galaxies themselves yielded probabilities that each of the four outcomes result from each source type. Overall, results are drawn from the correct sources a majority of the time, at 52% for ellipticals, 45% for lenticulars, 61% for spirals, and 71% for irregular galaxies. These likelihoods held up when the method was tested on galaxies near the target z 0.1 redshift with rough classifications available from the COSMOS survey. Finally, the method was applied to numerous galaxies at z 0.1 with established star formation rates and stellar masses to reveal connections between these values and galactic type. Most notably, lenticular galaxies, while of comparable mass to ellipticals, were shown to be undergoing more current star formation, and irregular galaxies were observed to contain generally less stellar material than spirals. This project was supported by the National Science Foundation as part of the Summer 2010 Astronomy REU Program at Indiana University.
Bell Keaton
Salim Samir
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