Distribution of extinction and star formation in NGC 1569 Relaño Pastor, Mónica Lisenfeld , Ute Vílchez, José Battaner López, Eduardo Galaxies NGC 1569 ISM Irregular Dust Extinction This work was presented at the Spitzer Conference Infrared Diagnostics of Galaxy Evolution, 14-16 November 2005 We investigate the distribution of the intrinsic extinction in NGC1569 using an extinction map derived from the H_alpha/H_beta emission line ratio. We compare the extinction distribution to that of the dust emission traced by SPITZER IRAC(8microns) and MIPS (24microns) maps. The intrinsic extinction shows spatial variations, from zones with negligible extinction to zones with values up to A(V)=0.8mag. We find an extinction shell and establish a relation between this shell and the interstellar expanding structure produced by the stellar winds comig 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 8microns and 24microns maxima and the maximum in Balmer extinction which needs further investigation. 2013-10-10T12:55:50Z 2013-10-10T12:55:50Z 2006 preprint Relaño, M.; et al. Distribution of extinction and star formation in NGC 1569. Astronomy and Astrophysics, 452(2): 413-421 (2006). [http://hdl.handle.net/10481/28415] 0004-6361 1432-0746 arXiv:astro-ph/0603646v1 http://hdl.handle.net/10481/28415 10.1051/0004-6361:20054607 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License European Southern Observatory (ESO); Springer Verlag