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The Tully-Fisher Relation for Hickson Compact Groups

Published online by Cambridge University Press:  26 May 2016

Philippe Amram ,
Claudia Mendes De Oliveira ,
Henri Plana  and
Chantal Balkowski
Philippe Amram
Affiliation:
Observatoire de Marseille, France
Claudia Mendes De Oliveira
Affiliation:
Instituto de Astronomia, Sao Paulo, Brazil
Henri Plana
Affiliation:
Universidade de Santa Cruz, Brazil
Chantal Balkowski
Affiliation:
Observatoire de Paris, France

Abstract

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We investigate the properties of the B-band Tully-Fisher (TF) relation for 25 compact group galaxies, using Vmax derived from 2-D velocity maps. Our main result is that the majority of the Hickson Compact Group (HCG) galaxies lie on the TF relation, although with large scatter. However, 20% of the galaxies, including the lowest-mass systems, seem to have higher B luminosities, for a given mass, or alternatively, a mass which is too low for their luminosities. We favour the scenario of brightening of the outliers due to either enhanced star formation or merging, rather than truncation of the dark halo due to interactions, to explain the position of the outliers on the TF relation.

Type
Part 12: Dark and Visible Matter Scaling Relations
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 413 - 414
Copyright
Copyright © Astronomical Society of the Pacific 2004