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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:I review the nature of UV-radiation in galaxies of different morphological types.
The UV-excess in massive elliptical galaxies which have
predominantly old stellar populations is traditionally explained by the
contribution of low-mass stars at very late, poorly known stages of evolution --
by so called `AGB-manqu\'e' stars or by the populations of extended horizonthal
branch. However recent results from the GALEX survey for a rich sample of nearby
ellipticals have also demonstrated probable traces of recent star formation
in a third of all ellipticals observed. In spiral galaxies the extended UV-disks
have been discovered by the GALEX; they are certainly illuminated by the
current star formation, but what has provoked star formation in the area
of very low gas density, beyond the distribution of older stars, is
a puzzle yet. The UV-spectra of starburst galaxies/galactic nuclei are characterized
by weak emission lines, if any, quite dissimilar to their optical spectra.