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• W2022225949 abstract "We present Spitzer infrared imaging of the peculiar galaxy pair Arp 107 and compare with an optical H? map and a numerical model of the interaction. The [3.6] - [4.5] colors of clumps in the galaxy do not vary around the ringlike primary spiral arm and are consistent with those of stars; thus, these bands are dominated by starlight. In contrast, the [5.8 ?m] - [8.0 ?m] colors are consistent with those of interstellar dust and vary by about 0.2 mag around the ring/spiral, with redder colors associated with regions with stronger star formation as indicated by H? and mid-infrared luminosity. The [4.5 ?m] - [5.8 ?m] colors for clumps in this arm are bluer than dust and redder than stars and vary by 1.3 mag around the arm. This color is therefore a measure of the relative number of young stars to old stars, with a redder color indicating a higher proportion of young stars. There is a clear azimuthal sequence in the [4.5] - [5.8] color around the arm, indicating a sequence in average stellar age. The LH?/L8.0 ?m ratio varies around the arm by a factor of ?7; this variation may be due to extinction or to polycyclic aromatic hydrocarbon excitation by nonionizing photons. Our model of Arp 107 accounts for the general morphology of the system and explains the age variation along the arm as the result of differences in the time of maximum compression in the arm. Using Spitzer colors, we are able to distinguish background quasars and foreground stars from star-forming regions associated with Arp 107." @default.
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• W2022225949 date "2005-11-01" @default.
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• W2022225949 title "UsingSpitzerColors as Diagnostics of Star Formation Regions: The Interacting Galaxy Arp 107" @default.
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• W2022225949 doi "https://doi.org/10.1086/491788" @default.
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