The distribution of the ultraviolet emission in the disk of Messier 33

Details The distribution of the ultraviolet emission in the disk of Messier 33 The distribution of the ultraviolet emission in the disk of Messier 33

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..666b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 3, p. 666-672

Astronomy and Astrophysics

Astronomy

14

Disk Galaxies, Interstellar Extinction, Spiral Galaxies, Star Formation, Ultraviolet Astronomy, Ultraviolet Emission, Astronomical Photometry, Cosmic Dust, Diffuse Radiation, Point Sources, Spatial Distribution

Scientific paper

Ultraviolet (2000 A) observations of Messier 33 at a resolution of 20 arcsec are used to study the repartition of the UV emission in the disk of this galaxy. The relative contribution of discrete sources and diffuse areas to the UV emission are estimated: sources are found to dominate the UV emission. The fraction of the UV flux arising from diffuse regions would not exceed 20%, the exact value depending on the corrections for dust extinction applied to the UV emission. Implications of these results on the recent star formation activity in Messier 33 as well as on the evaluation of the dust extinction affecting the UV emission in galactic disks are discussed.

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