CORRELATIONS BETWEEN NEBULAR EMISSION AND THE CONTINUUM SPECTRAL SHAPE IN SDSS GALAXIES
- Department of Physics, Eoetvoes University, Budapest, Pf. 32, H-1518 (Hungary)
- Department of Physics and Astronomy, Johns Hopkins University, 3701 San Martin Drive, Baltimore, MD 21218 (United States)
- Max-Planck-Institute fuer Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching (Germany)
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.
- OSTI ID:
- 21583166
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 141, Issue 4; Other Information: DOI: 10.1088/0004-6256/141/4/133; ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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