Correlations between Nebular Emission and the Continuum Spectral Shape in SDSS Galaxies

Details Correlations between Nebular Emission and the Continuum Spectral Shape in SDSS Galaxies Correlations between Nebular Emission and the Continuum Spectral Shape in SDSS Galaxies

2011-10-09

arxiv.org/abs/1110.1877v1

The Astronomical Journal, Volume 141, Issue 4, 133 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

38 pages, 20 figures

Scientific paper

10.1088/0004-6256/141/4/133

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.

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