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We present a new database of absorption and emission-line measurements basedon the entire spectral atlas from the Sloan Digital Sky Survey (SDSS) 7th datarelease of galaxies within a redshift of 0.2. Our work makes use of thepublicly available penalized pixel-fitting(pPXF) and gas and absorption linefitting (gandalf) IDL codes, aiming to improve the existing measurements forstellar kinematics, the strength of various absorption-line features, and theflux and width of the emissions from different species of ionised gas. Our fitto the stellar continuum uses both standard stellar population models andempirical templates obtained by combining a large number of stellar spectra inorder to fit a subsample of high-quality SDSS spectra for quiescent galaxies.Furthermore, our fit to the nebular spectrum includes an exhaustive list ofboth recombination and forbidden lines. Foreground Galactic extinction isimplicitly treated in our models, whereas reddening in the SDSS galaxies isincluded in the form of a simple dust screen component affecting the entirespectrum that is accompanied by a second reddening component affecting only theionised gas emission. In order to check for systematic departures, we provide aquality assessment for our fit to the SDSS spectra in our sample. This qualityassessment also allows the identification of objects with either problematicdata or peculiar features. For example, based on the quality assessment,approximately 1% of the SDSS spectra classified as "galaxies" by the SDSSpipeline do in fact require additional broad lines to be matched, even thoughthey do not show a strong continuum from an active nucleus, as do the SDSSobjects classified as "quasars". Finally, we provide new spectral templates forgalaxies of different Hubble types, obtained by combining the results of ourspectral fit for a subsample of 452 morphologically selected objects.

Improved and Quality-assessed Emission and Absorption Line measurements in Sloan Digital Sky Survey galaxies