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Date and Time of the Query: 2019-04-23 T14:53:54 PDT
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For refcode 1990ApJ...363..422K:
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1990ApJ...363..422K VACUUM ULTRAVIOLET IMAGERY OF THE VIRGO CLUSTER REGION. II. TOTAL FAR-ULTRAVIOLET FLUX OF GALAXIES K. KODAIRA AND T. WATANABE National Astronomical Observatory, Japan AND T. ONAKA AND W. TANAKA Department of Astronomy, University of Tokyo Received 1990 March 15; accepted 1990 May 3 ABSTRACT The total flux in the far-ultraviolet region around 150 nm was measured for more than 40 galaxies in the central region of the Virgo Cluster, using two imaging telescopes on board a sounding rocket. The observed far-ultraviolet flux shows positive correlations with the H I 21 cm flux and the far-infrared flux for spiral galaxies, and with the X-ray flux and the radio continuum flux for elliptical galaxies. The former correlations of spiral galaxies are interpreted in terms of star formation activity, which indicates substantial depletion in the Virgo galaxies in accordance with the H I stripping. The latter correlations of elliptical galaxies indicate possible far-ultraviolet sources of young population, in addition to evolved hot stars. Far- ultraviolet fluxes from two dwarf elliptical galaxies were obtained tentatively, indicating star formation activity in elliptical galaxies. A high-resolution UV imagery by HST would be effective to distinguish the young population and the old population in elliptical galaxies. Subject headings: galaxies: clustering - galaxies: photometry - ultraviolet: general
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