Publicly Available Database : Improved Spectral Line Measurements In SDSS DR7 Galaxies

Details Publicly Available Database : Improved Spectral Line Measurements In SDSS DR7 Galaxies Publicly Available Database : Improved Spectral Line Measurements In SDSS DR7 Galaxies

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924605o&link_type=abstract

American Astronomical Society, AAS Meeting #219, #246.05

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new database of absorption and emission line measurements based on the Sloan Digital Sky Survey 7th data release for the galaxies within a redshift of 0.2. Our work makes use of the publicly available penalized pixel-fitting(pPXF) and GANDALF codes, aiming to improve the existing measurements for stellar kinematics, the strength of various absorption-line features, and the flux and width of the emissions from different species of ionized gas.
The absorption line strengths measured by SDSS pipeline are seriously contaminated by emission fill-in. We effectively separate emission lines from absorption lines. For instance, this work successfully extract [NI] doublet from Mgb and it leads to more realistic result of alpha enhancement on late-type galaxies compared to the previous database. Besides accurately measuring line strengths, the database provides new parameters that are indicative of line strength measurement quality. Users can build a subset of database optimal for their studies using specific cuts in the fitting quality parameters as well as empirical signal-to-noise. Applying these parameters, we found `hidden’ broad-line-region galaxies and they turned out to be Seyfert I nuclei that were not picked up as AGN by SDSS.
The database is publicly available at http://gem.yonsei.ac.kr/ossy

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