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Dust in Nearby Groups of Galaxies?

Published online by Cambridge University Press:  08 February 2017

M. Girardi ,
G. Giuricin ,
F. Mardirossian  and
M. Mezzetti
M. Girardi
Affiliation:
1S.I.S.S.A., Strada Costiera 11, 34014 Trieste, Italy
G. Giuricin
Affiliation:
2Department of Astronomy, via G.B. Tiepolo 11, 34131 Trieste, Italy
F. Mardirossian
Affiliation:
2Department of Astronomy, via G.B. Tiepolo 11, 34131 Trieste, Italy
M. Mezzetti
Affiliation:
2Department of Astronomy, via G.B. Tiepolo 11, 34131 Trieste, Italy

Abstract

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The excess of higher redshift galaxies relative to the brightest member, found by several authors in poor, loose groups, is found to be present also in nearby, small groups identified by Geller and Huchra (1983) in the Center for Astrophysics Survey. This effect is explained as being due to the presence of diffuse intragroup dust together with an early evolutionary stage of nearby galaxy groups. An expected negative correlation between color excesses of galaxies and the velocity relative to the brightest member is found to be highly significant for both B-V and U-B colors. The optical depth produced by dust in groups turns out to be on the order of one, with a density of about 10−29 g/cm3.

Type
IV. Extragalactic Background Radiation and Cosmology
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 375 - 376
Copyright
Copyright © Kluwer 1990 

References

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