Vacuum ultraviolet imagery of the Virgo cluster region
Citations Over TimeTop 10% of 1989 papers
Abstract
Vacuum ultraviolet (λ = 145-180 nm) images of the Virgo Cluster region were obtained by a rocket-borne experiment. Forty-five stars and 11 galaxies were observed, and their fluxes at 156 nm are presented. Of these, seven galaxies were observed for the first time in the vacuum ultraviolet region. Six new ultraviolet sources were detected, and possible candidates except for one object were identified as stars of spectral types earlier than A3. A comparison of stellar data suggests that the absolute fluxes at 156 um of the present experiment are about 20% less than those of the 156.5 nm band of TD-1 experiments. The present data on NGC 4486 and NGC 472 confirm the variation in the degree of the "turnup" below 200 nm in the energy spectrum of the total light of elliptical galaxies, which was previously noted by OAO 2 and confirmed in the small-diaphragm observations by IUE. A two-color diagram of galaxies of visual/near-ultraviolet/vacuum ultraviolet indicates that colors of spiral galaxies are distributed within a strip and well correlated with the morpholgical type, while elliptical galaxies are located differently from spiral galaxies. The present data are discussed also in connection with the recently discovered high-redshift (z > 3) galaxies.
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