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HI Studies of the Sculptor Group Galaxies

Published online by Cambridge University Press:  12 April 2016

Claude Carignan  and
Daniel Puche
Claude Carignan
Affiliation:
Université de Montréal
Daniel Puche
Affiliation:
Very Large Array, NRAO

Abstract

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Results from large-scale mapping of the HI gas in the Sculptor group are presented. From our kinematic analysis, a mean global (M/LB) ⋍ 9 M⊙/L⊙ (at the last observed velocity point) is found for the individual galaxies. This is only a factor ~ 10 smaller than the (M/LB)dyn ⋍ 90 M⊙/L⊙ derived from a dynamical study of the whole group. The parameters derived from the mass models suggest that most of the unseen matter has to be concentrated around the luminous galaxies. Under the assumption that the Sculptor group is a virialized system and that all the mass is associated with the galaxies, an upper limit of ~ 40 kpc is derived for the size of the dark halos present in the five late-type spirals of the group.

Type
II. Classical Observations of Multiplets
Information
International Astronomical Union Colloquium , Volume 124: Paired and Interacting Galaxies , 1990 , pp. 129 - 131
Copyright
Copyright © NASA 1990

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