Population analysis of faint galaxies with mixture modeling

Astronomical Journal
By: , and 



We investigate the use of spectral mixture modeling to decompose the integrated spectra of several galaxies. This technique uses a linear combination of template spectra to model over 93% of the variance in Kennicutt's sample of galaxy spectra. One result of our model is a stellar population parameter for each galaxy, which correlates with both star formation rate and the population's mass-to-light ratio. Armed with the template spectra, we use mixture modeling to develop a photometric system that is independent of redshift, in order to more precisely measure the color evolution of galaxies. We show how to use the photometric system to model the composition of high-redshift galaxies in terms of the template spectra, and hence estimate their star-formation history. This photometric technique avoids being biased by the nucleus, unlike techniques which rely on slit spectra.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Population analysis of faint galaxies with mixture modeling
Series title Astronomical Journal
DOI 10.1086/118526
Volume 114
Issue 3
Year Published 1997
Language English
Publisher American Astronomical Society
Contributing office(s) Astrogeology Science Center
Description 7 p.
First page 958
Last page 964
Other Geospatial Mars