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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 606543.0, MPI für Astronomie / Publikationen_mpia
Correlations between nebular emission and the continuum spectral shape in SDSS galaxies
Authors:Györy, Z.; Szalay, A. S.; Budavári, T.; Csabai, I.; Charlot, S.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:The Astronomical Journal
Volume:141
Issue / Number:4
Audience:Not Specified
Abstract / Description:We present a statistical study of the correlations and dimensionality of emission lines carried out on a sample of over 40,000 Sloan Digital Sky Survey (SDSS) galaxies. Using principal component analysis, we found that the equivalent widths of the 11 strongest lines can be well represented using three parameters. We also explore correlations of the emission pattern with the eigenspace representation of the continuum spectrum. The observed relations are used to provide an empirical prescription for expectation values and variances of emission-line strengths as a function of spectral shape. We show that this estimation of emission lines has a sufficient accuracy to make it suitable for photometric applications. The method has already proved useful in SDSS photometric redshift estimation.
Free Keywords:galaxies: evolution; methods: statistical; techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2011AJ....141..133G
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