Low Resolution Spectral Templates For Galaxies From 0.2 -- 10 microns

Abstract

We built an optimal basis of low resolution templates for galaxies over the wavelength range from 0.2 to 10 $\mu$m using a variant of the algorithm presented by Budavari et al. (2000). We derived them using eleven bands of photometry from the NDWFS, FLAMEX, zBoötes and IRAC Shallow surveys for 16033 galaxies in the NDWFS Boötes field with spectroscopic redshifts measured by the AGN and Galaxy Evolution Survey. We also developed algorithms to accurately determine photometric redshifts, K corrections and bolometric luminosities using these templates. Our photometric redshifts have an accuracy of ${\sigma }_z/(1+z)=0.04$ when clipped to the best 95%. We used these templates to study the spectral type distribution in the field and to estimate luminosity functions of galaxies as a function of redshift and spectral type. In particular, we note that the 5-8$\mu$m color distribution of galaxies is bimodal, much like the optical g--r colors.

Accepted for publication in The Astrophysical Journal. 22 text pages + 6 tables + 15 figures. Minor modifications from the original version. Fortran codes, templates and electronic tables available at http://www.astronomy.ohio-state.edu/~rjassef/lrt/

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