Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533807o&link_type=abstract
American Astronomical Society, AAS Meeting #215, #338.07; Bulletin of the American Astronomical Society, Vol. 42, p.443
Other
Scientific paper
We have established a database of galaxy spectral line strengths for the SDSS database using an improved line measuring method. Our work includes the entire SDSS DR7 galaxies within redshift of 0.2. The absorption line strengths measured by the SDSS pipeline are seriously contaminated by emission filling. Our code, GANDALF (gas and absorption line fitting code) performs more accurate measurements by effectively separating emission lines from absorption lines. A significant improvement has also been made on the velocity dispersion measurement, more notably in late-type galaxies. We have also identified a number of broad line region galaxies which were misclassified as normal galaxies by the SDSS pipeline. Besides precisely measuring line strengths, our work is useful in two other aspects. First, we developed an effective method quantifying the reliability of our line measurements which does not only depend on the pipeline signal-to-noise ratio but also significantly depend on the line measurement technique. Combining the empirical signal-to-noise with this fitting quality parameter, one can choose galaxies with reliable line strengths. Second, we made galaxy spectral templates for the Hubble sequence. The database will be useful for many fields of galaxy studies including star formation and AGN activities.
Oh Kyuseok
Sarzi Marc
Yi Kyung--Soo
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