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Paper: Distribution of Extinction and Star Formation in NGC 1569
Volume: 381, The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution
Page: 185
Authors: Relaño, M.; Lisenfeld, U.; Battaner, E.; Vilchez, J.M.; Pérez-González, P.
Abstract: We investigate the distribution of the intrinsic extinction in NGC 1569 using an extinction map derived from the Hα/Hβ emission line ratio. We compare the extinction distribution to that of the dust emission traced by Spitzer IRAC (8 μm) and MIPS (24 μm) maps. The intrinsic extinction shows spatial variations, from zones with negligible extinction to zones with values up to AV=0.8 mag. We find an extinction shell and establish a relation between this shell and the interstellar expanding structure produced by the stellar winds coming from the Super Star Cluster (SSCs) A and B in the center of the galaxy. We suggest that the extinction shell has been produced by the accumulation of dust at the border of the shell. Although we find a good spatial correlation between the Balmer extinction and infrared emission, there is a spatial displacement between the 8 μm and 24 μm maxima and the maximum in Balmer extinction which needs further investigation.
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