Population Synthesis Modeling of QSO Host Galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

A strong connection between AGN activity and galaxy formation/evolution has emerged over the past few years. To obtain further insight into this important evolutionary phase we wish to analyze the properties of the host galaxies of AGN, using the tools of population synthesis. To this end, we investigate the utilization of simulated annealing and down-hill simplex method of optimization in the modeling of QSO host galaxy spectra. In this technique, subtraction of residual scattered quasar light in the observed spectra is performed while simultaneously modeling the constituent stellar populations of the host galaxy. The reliability of this method is tested by generating spectra with known parameters, adding noise, and measuring the correspondence between the known input and the output of the program. Preliminary results of the application of this program to data from off-nuclear host galaxy spectra via long-slit and integral field unit observations on the Keck and WIYN telescopes will be presented.

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