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The Nature of Hickson Compact Group 18

Published online by Cambridge University Press:  12 April 2016

Henri Plana
Affiliation:
Observatorio Astronomico Nacional UNAM, Ensenada, Mexico
Claudia Mendes de Oliveira
Affiliation:
Instituto Astronômico e Geofísico (IAG/USP), São Paulo, Brazil
Philippe Amram
Affiliation:
Observatoire de Marseille, Marseille, France
Chantal Balkowski
Affiliation:
Observatoire de Paris Meudon, Paris, France

Abstract

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We present new observations of Hα emission of the Hickson Compact Group 18 (HCG 18) obtained with a scanning Fabry-Perot interferometer. The velocity field does not show motions of individual group members but instead a complex common velocity field of H18b, c and d. The gas distribution is very clumpy with blobs coinciding with group members but located also elsewhere. Comparing Hα with H ɪ data we reached the conclusion that HCG 18 seems to be an irregular galaxy containing several clumps of star formation sites.

Type
Part 2. Properties of Small Groups
Copyright
Copyright © Astronomical Society of the Pacific 2000

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