Distribution of dark matter in the spiral galaxy NGC 3198

Journal Article · Thu Aug 01 04:00:00 EDT 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163375· OSTI ID:5573468

Van Albada, T S; Begeman, K; Sanscisi, R; Bahcall, J N

Two-component mass models, consisting of an exponential disk and a spherical halo, are constructed to fit a newly determined rotation curve of NGC 3198 that extends to 11 disk scale lengths. The amount of dark matter inside the last point of the rotation curve, at 30 kpc, is at least 4 times larger than the amount of visible matter, with M/L(B)tot = 18 solar M/L(B). The maximum mass-to-light ratio for the disk is M/L(B) = 3.6. The available data cannot discriminate between disk models with low M/L and high M/L, but arguments are presented which suggest that the true mass-to-light ratio of the disk is close to the maximum computed value. The core radius of the distribution of dark matter is found to satisfy R(core) of between 1.7 and 12.5 kpc. 31 references.

• Research Organization: Groningen Rijksuniversiteit, Netherlands; Institute for Advanced Study, Princeton, NJ
• OSTI ID: 5573468
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 295; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
DISTRIBUTION
GALAXIES
MASS DISTRIBUTION
MATHEMATICAL MODELS
MORPHOLOGY
MOTION
NONLUMINOUS MATTER
ROTATION
SPATIAL DISTRIBUTION
SPIRAL CONFIGURATION