Mid-to-Far Infrared Spectral Energy Distribution of Galaxies in Spitzer First Look Survey Field

Abstract

We made model fitting to the mid-to-far infrared spectral energy distributions (SEDs) for different categories of galaxies in the main extragalactic field of the {\it Spitzer} First Look Survey with the aid of spectroscopic information from the Sloan Digital Sky Survey. We find that the mid-to-far infrared SEDs of HII galaxies, mixture type galaxies and LINERs can be well fitted by the one-parameter ($\alpha$) dust model of Dale et al. plus the 13 Gyr dust-free elliptical galaxy model. The statistics of $\alpha$ values indicates that all these galaxies tend to be quiescent, although the HII galaxies are relatively more active than the LINERs. The mid-infrared SEDs of absorption galaxies are well fitted simply by the 13 Gyr dust-free elliptical galaxy template, and the near-to-mid infrared SEDs of QSOs can be represented by AGN NGC 5506.

arXiv comment12 pages with 8 figures, will be appeared in ChJAA, Vol.7 (2007), No.2

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• Morphological Dependence of MIR Properties of SDSS Galaxies in the Spitzer SWIRE Survey
• The Debris Disk Candidates: Eleven 24$\mu$m excess stars in Spitzer SWIRE Fields
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