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Title:
Revealing components of the galaxy population through non-parametric techniques
Authors:
Bamford, Steven P.; Rojas, Alex L.; Nichol, Robert C.; Miller, Christopher J.; Wasserman, Larry; Genovese, Christopher R.; Freeman, Peter E.
Affiliation:
AA(Institute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG; Centre for Astronomy & Particle Theory, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD), AB(Department of Statistics, Baker Hall, Carnegie Mellon University, Pittsburgh, PA 15213, USA; Carnegie Mellon University in Qatar, c/o Qatar Foundation, PO Box 24866, Doha, Qatar), AC(Institute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG), AD(Observatorio Cerro Tololo, Observatorio de AURA en Chile, Casilla 603, La Serena, Chile), AE(Department of Statistics, Baker Hall, Carnegie Mellon University, Pittsburgh, PA 15213, USA), AF(Department of Statistics, Baker Hall, Carnegie Mellon University, Pittsburgh, PA 15213, USA), AG(Department of Statistics, Baker Hall, Carnegie Mellon University, Pittsburgh, PA 15213, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 391, Issue 2, pp. 607-616. (MNRAS Homepage)
Publication Date:
12/2008
Origin:
MNRAS
Astronomy Keywords:
methods: statistical , galaxies: clusters: general , galaxies: fundamental parameters , galaxies: statistics
DOI:
10.1111/j.1365-2966.2008.13963.x
Bibliographic Code:
2008MNRAS.391..607B

Abstract

The distributions of galaxy properties vary with environment, and are often multimodal, suggesting that the galaxy population may be a combination of multiple components. The behaviour of these components versus environment holds details about the processes of galaxy development. To release this information we apply a novel, non-parametric statistical technique, identifying four components present in the distribution of galaxy Hα emission-line equivalent widths. We interpret these components as passive, star forming and two varieties of active galactic nuclei. Independent of this interpretation, the properties of each component are remarkably constant as a function of environment. Only their relative proportions display substantial variation. The galaxy population thus appears to comprise distinct components which are individually independent of environment, with galaxies rapidly transitioning between components as they move into denser environments.
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