Distribution of extinction and star formation in NGC1569

Abstract

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.

4 pages, presented at the Spitzer Conference Infrared Diagnostics of Galaxy Evolution, 14-16 November 2005

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Cited by in corpus (11)

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• Aperture-free star formation rate of SDSS star-forming galaxies
• The Role of the Magnetic Field in the Interstellar Medium of the Post-Starburst Dwarf Irregular Galaxy NGC 1569
• On the metallicity dependence of the 24micron luminosity as a star formation tracer
• A New Hubble Space Telescope Distance to NGC 1569: Starburst Properties and IC 342 Group Membership
• HST/ACS Photometry of Old Stars in NGC 1569: The Star Formation History of a Nearby Starburst
• Mapping the Spatial Distribution of Dust Extinction in NGC 959 Using Broadband Visible and mid-IR Filters
• A Spatially Resolved Radio Spectral Index Study of the Dwarf Irregular Galaxy NGC\,1569
• Probing the interstellar medium of NGC1569 with Herschel
• Analysis of the Intrinsic Mid-Infrared L-band to Visible--Near-Infrared Flux Ratios in Spectral Synthesis Models of Composite Stellar Populations
• NGC 2366 : An optical search for possible supernova remnants