Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7601h&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #76.01; Bulletin of the American Astronomical Society, Vol. 26, p.1433
Astronomy and Astrophysics
Astronomy
Scientific paper
We have obtained narrow-band Hα imaging and radio continuum synthesis maps for the nearby southern spiral galaxy M83 (NGC 5236) in order to study the variation of the extinction due to dust across the disk of the galaxy. The Australia Telescope Compact Array has been used in 3 of its highest resolution configurations to map M83 in both the 6 cm and the 13 cm continuum, so that non-thermal sources can be distinguished from Hii regions. By comparing the optical Hα and thermal radio continuum flux ratios of individual Hii regions with those expected from theory, we wish to test whether or not M83 possesses a well-defined radial extinction gradient. Previous searches for such a gradient in M81 (Kaufman et al. 1987, ApJ, 319, 61) and M51 (van der Hulst et al. 1988, A&A, 195, 38) have been inconclusive, but the high Hii region luminosities and significant dust content of M83 make it one of the best candidates for such a study. We present here the preliminary results of an analysis of this data, and outline some implications for the topical issue of opacity in spiral disks.
Hungerford Aimee Louise
Ryder Stuart D.
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