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Mid-Infrared Observations of Normal Star-Forming Galaxies: The Infrared Space Observatory Key Project Sample 1

By Daniel A. Dale, Nancy A. Silbermann, George Helou, Emmanuel Valjavec, Charles A. Beichman, James Brauher, Ra Contursi, Harriet L, David J. Hollenbach, Deidre A. Hunter, Sonali Kolhatkar, Kwok-yung Lo, Steven D. Lord, Nanyao Y. Lu, Robert H. Rubin, Gordon J. Stacey, Harley A, Michael W. Werner and Harold G. Corwin


We present mid-infrared maps and preliminary analysis for 61 galaxies observed with the ISOCAM instrument aboard the Infrared Space Observatory. Many of the general features of galaxies observed at optical wavelengths—spiral arms, disks, rings, and bright knots of emission—are also seen in the midinfrared, except the prominent optical bulges are absent at 6.75 and 15 µm. In addition, the maps are quite similar at 6.75 and 15 µm, except for a few cases where a central starburst leads to lower Iν(6.75µm) Iν(15µm) ratios in the inner region. We also present infrared flux densities and mid-infrared sizes for these galaxies. The mid-infrared color Iν(6.75µm) shows a distinct trend with the far-infrared color Iν(15µm) Iν(60µm

Year: 2000
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