The ultraviolet color gradient in the late-type spiral galaxy M33

Details The ultraviolet color gradient in the late-type spiral galaxy M33 The ultraviolet color gradient in the late-type spiral galaxy M33

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401l..83l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 401, no. 2, p. L83-L86.

Astronomy and Astrophysics

Astronomy

17

Spiral Galaxies, Ultraviolet Astronomy, Brightness Distribution, H Ii Regions, Interstellar Extinction, Metallicity

Scientific paper

The ultraviolet surface brightness and color distributions for the late-type spiral galaxy M33 are derived from images at 1520 and 2490 A that were obtained by the Ultraviolet Imaging Telescope (UIT) on the Astro Spacelab mission. Although the surface brightness shows a general decline with radius, the dominant spiral arms cause significant deviations from an exponential fit. Colors in elliptical annuli become 0.2-0.3 mag bluer with increasing radius. Our measures of individual H II regions and sections of spiral arms follow this same trend. Interarm regions are redder than the arms. A metallicity gradient affecting only the colors of stars is inadequate in accounting for the observed color gradient. A plausible explanation invokes a combination of an LMC-type reddening curve and a radial gradient in the internal reddening in M33.

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