Ultraviolet Imaging Telescope ultraviolet images - Large-scale structure, H II regions, and extinction in M81

Details Ultraviolet Imaging Telescope ultraviolet images - Large-scale structure, H II regions, and extinction in M81 Ultraviolet Imaging Telescope ultraviolet images - Large-scale structure, H II regions, and extinction in M81

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l..37h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 1, p. L37-L40.

Astronomy and Astrophysics

Astronomy

37

H Ii Regions, Interstellar Extinction, Spiral Galaxies, Ultraviolet Telescopes, Brightness Distribution, Charge Coupled Devices, Image Processing, Spaceborne Astronomy, Ultraviolet Astronomy

Scientific paper

The study employs UV images of M81 obtained by the Ultraviolet Imaging Telescope (UIT) during the December 1990 Astro-1 spacelab mission to determine 2490- and 1520-A fluxes from 46 H II regions and global surface brightness profiles. Comparison photometry in the V band is obtained from a ground-based CCD image. UV radial profiles show bulge and exponential disk components, with a local decrease in disk surface brightness inside the inner Lindblad Resonance about 4 arcmin from the nucleus. The V profile shows typical bulge plus exponential disk structure, with no local maximum in the disk. There is little change of UV color across the disk, although there is a strong gradient in the bulge. Observed m152-V colors of the H II regions are consistent with model spectra for young clusters, after dereddening using Av determined from m249-V and the Galactic extinction curve. The value of Av, so determined, is 0.4 mag greater on the average than Av derived from radio continuum and H-alpha fluxes.

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