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The Nature of Hickson Compact Group 18

Published online by Cambridge University Press:  12 April 2016

Henri Plana ,
Claudia Mendes de Oliveira ,
Philippe Amram  and
Chantal Balkowski
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
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 112 - 115
Copyright
Copyright © Astronomical Society of the Pacific 2000

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