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Paper: An Initial Look at the FIR-Radio Correlation within M51a using Spitzer
Volume: 357, The Spitzer Space Telescope: New Views of the Cosmos
Page: 194
Authors: Murphy, E.J.; Armus, L.; Helou, G.; Braun, R.; the SINGS team
Abstract: We present an initial look at the FIR-radio correlation within the star-forming disk of M51a using Spitzer MIPS imaging, observed as part of the Spitzer Infrared Nearby Galaxies Survey (SINGS), and WSRT radio continuum data. At an estimated distance of 8.2 Mpc, we are able to probe the variations in the 70μm/22cm ratios across the disk of M51a at a linearly projected scale of 0.75 kpc. We measure a dispersion of 0.191 dex, comparable to the measured dispersion of the global FIR-radio correlation. Such little scatter in the IR/radio ratios across the disk suggests that we have yet to probe physical scales small enough to observe a breakdown in the correlation. We also find that the global 70μm/22cm ratio of M51a is 25% larger than the median value of the disk, suggesting that the brighter disk regions drive the globally measured ratio.
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