H I studies of the Sculptor group galaxies.
Abstract
Results from large-scale mapping of the H I gas in the Sculptor group are presented. From kinematic analysis, a mean global (M/LB) ≅ 9 Msun/Lsun (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 Msun/Lsun 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.
- Publication:
-
NASA Conference Publication
- Pub Date:
- November 1990
- Bibcode:
- 1990NASCP3098..129C
- Keywords:
-
- Density (Mass/Volume);
- Galaxies;
- H I Regions;
- Kinematics;
- Luminosity;
- Mass To Light Ratios;
- Matter (Physics);
- Halos;
- Solar Radiation;
- Very Large Array (Vla);
- Astrophysics;
- Galaxy Groups: Dynamics;
- Galaxy Groups: H I Observations;
- Galaxy Groups: Kinematics