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Separating Physical Components from Galaxy Spectra by Subspace Methods

Published online by Cambridge University Press:  01 December 2006

Ching-Wa Yip ,
Alex S. Szalay ,
Andrew J. Connolly  and
Tamas Budavári
Ching-Wa Yip*
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
Alex S. Szalay
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
Andrew J. Connolly
Affiliation:
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
Tamas Budavári
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218, USA
*
†Keck Fellow. Email to authors: cwyip@pha.jhu.edu; szalay@pha.jhu.edu
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Abstract

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Using subspace methods, we study the distribution of physical components of galaxies in wavelength space. We find that it is valid to assume that the stellar and the gaseous components of galaxies span complementary subspaces. To first order, stellar and gaseous spectral features can be extracted from galaxy spectra through a simple matrix multiplication. By comparing the stellar continua obtained respectively using the model-based and the empirical approach through a commonality measure, we conclude that the latter may lose higher-order spectral features.

Keywords

galaxies: fundamental parameters – techniques: spectroscopic – methods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 201 - 202
Copyright
Copyright © International Astronomical Union 2007

References

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Oja, E. 1983, Subspace Methods of Pattern Recognition, Research Studies Press.Google Scholar
Yip, C. W., Connolly, A. J., Szalay, A. S. et al. 2004, AJ, 128, 585CrossRefGoogle Scholar