Correlations between nebular emission and the continuum spectral shape in SDSS galaxies

Zsuzsanna Gyory, Alexander S. Szalay, Tamás Budavári, I. Csabai, Stéphane Charlot

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number133
JournalAstronomical Journal
Volume141
Issue number4
DOIs
Publication statusPublished - Apr 2011

Fingerprint

galaxies
continuums
principal components analysis
principal component analysis
method
prescription
parameter

Keywords

  • galaxies: evolution
  • methods: statistical
  • techniques: spectroscopic

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Correlations between nebular emission and the continuum spectral shape in SDSS galaxies. / Gyory, Zsuzsanna; Szalay, Alexander S.; Budavári, Tamás; Csabai, I.; Charlot, Stéphane.

In: Astronomical Journal, Vol. 141, No. 4, 133, 04.2011.

Research output: Contribution to journalArticle

Gyory, Zsuzsanna ; Szalay, Alexander S. ; Budavári, Tamás ; Csabai, I. ; Charlot, Stéphane. / Correlations between nebular emission and the continuum spectral shape in SDSS galaxies. In: Astronomical Journal. 2011 ; Vol. 141, No. 4.
@article{0e260cd8942a4e62b7f7a351e6909726,
title = "Correlations between nebular emission and the continuum spectral shape in SDSS galaxies",
abstract = "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.",
keywords = "galaxies: evolution, methods: statistical, techniques: spectroscopic",
author = "Zsuzsanna Gyory and Szalay, {Alexander S.} and Tam{\'a}s Budav{\'a}ri and I. Csabai and St{\'e}phane Charlot",
year = "2011",
month = "4",
doi = "10.1088/0004-6256/141/4/133",
language = "English",
volume = "141",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "4",

}

TY - JOUR

T1 - Correlations between nebular emission and the continuum spectral shape in SDSS galaxies

AU - Gyory, Zsuzsanna

AU - Szalay, Alexander S.

AU - Budavári, Tamás

AU - Csabai, I.

AU - Charlot, Stéphane

PY - 2011/4

Y1 - 2011/4

N2 - 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.

AB - 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.

KW - galaxies: evolution

KW - methods: statistical

KW - techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=79953041763&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79953041763&partnerID=8YFLogxK

U2 - 10.1088/0004-6256/141/4/133

DO - 10.1088/0004-6256/141/4/133

M3 - Article

AN - SCOPUS:79953041763

VL - 141

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 4

M1 - 133

ER -