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We explore the correlation between morphological types and mid-infrared (MIR)properties of an optically flux-limited sample of 154 galaxies from the ForthData Release (DR4) of Sloan Digital Sky Survey (SDSS), cross-correlated withSpitzer SWIRE (Spitzer Wide-Area InfraRed Extragalactic Survey) fields ofELAIS-N1, ELAIS-N2 and Lockman Hole. Aperture photometry is performed on theSDSS and Spitzer images to obtain optical and MIR properties. The morphologicalclassifications are given based on both visual inspection and bulge-diskdecomposition on SDSS g- and r-band images. The average bulge-to-total ratio(B/T) is a smooth function over different morphological types. Both the8um(dust) and 24um(dust) luminosities and their relative luminosity ratios to3.6um (MIR dust-to-star ratios) present obvious correlations with both theHubble T-type and B/T. The early-type galaxies notably differ from thelate-types in the MIR properties, especially in the MIR dust-to-star ratios. Itis suggested that the MIR dust-to-star ratio is an effective way to separatethe early-type galaxies from the late-type ones. Based on the tight correlationbetween the stellar mass and the 3.6um luminosity, we have derived a formula tocalculate the stellar mass from the latter. We have also investigated the MIRproperties of both edge-on galaxies and barred galaxies in our sample. Sincethey present similar MIR properties to the other sample galaxies, they do notinfluence the MIR properties obtained for the entire sample.

Morphological Dependence of MIR Properties of SDSS Galaxies in the Spitzer SWIRE Survey