Separating Physical Components from Galaxy Spectra by Subspace Methods

Details Separating Physical Components from Galaxy Spectra by Subspace Methods Separating Physical Components from Galaxy Spectra by Subspace Methods

2007-01-30

arxiv.org/abs/astro-ph/0701861v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings for IAU symposium 241, "Stellar Populations as Building Blocks of Galaxies"

Scientific paper

10.1017/S1743921307007880

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.

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