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[99.03] An Initial Look at the FIR-Radio Correlation within the Star Forming Disks of M51 and NGC 7331 using Spitzer

E. J. Murphy (Yale University), G. Helou, L. Armus (SSC-Caltech), J. D. P. Kenney (Yale University), R. Braun (ASTRON (Netherlands)), G. J. Bendo, K. D. Gordon (University of Arizona), D. A. Dale (University of Wyoming), SINGS Team

We present an initial look at the far-infrared (FIR) to radio correlation within the spiral disks of M51 and NGC 7331 using Spitzer and radio (18 & 22cm) continuum data taken for the Spitzer Infrared Nearby Galaxies Survey (SINGS) Legacy science team. To measure the scatter within the disks over the large wavelength range of Spitzer, various types of q_\lambda\equiv F_\lambda/F_radio maps were made for IR fluxes F_\lambda = F_TIR, F_FIR, F₁₆₀,F₇₀ and F₂₄. To quantify the variations about the disk of the galaxies, we compare aperture photometry for nuclear, arm, inter-arm, disk, inner-disk, outer-disk, and ring environments from the registered and PSF matched images over various projected, physical apertures. We attempt to explain the IR/radio maps in the context of models for the propagation of cosmic ray electrons, the emission from very small and large grains, and quiescent and active star formation. We also compare our matched aperture results to global measurements for star-forming galaxies assembled from the literature.

E. J. M. would like to acknowledge support for this work provided by the Spitzer Science Center Visiting Graduate Student program. As part of the Spitzer Space Telescope Legacy Science Program, support was provided by NASA through Contract Number 1224769 issued by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.