On the understanding of the observed flat or slowly rising rotation curves in large disk galaxies

Previous observations of flat or slowly rising rotation curves up to large distances from the center found for large disk galaxies of all Hubble types are explained using normal fluid dynamic considerations under the assumption that viscous (and/or magnetic) transfer of mass and angular momentum fro...

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Bibliographic Details
Published inAstrophysics and space science Vol. 152; no. 1; pp. 131 - 139
Main Authors MITA GHOSH, BASU, B, TARA BHATTACHARYYA
Format Journal Article
LanguageEnglish
Published Dordrecht Kluwer 01.02.1989
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
Interstellar medium (ism) and nebulae in external galaxies
Stellar systems. Galactic and extragalactic objects and systems. The universe
Rotation curve
Gas flow
Navier Stokes equation
Disk galaxies
Angular momentum
Hydrodynamics
Equation resolution
Mathematical model
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Summary:Previous observations of flat or slowly rising rotation curves up to large distances from the center found for large disk galaxies of all Hubble types are explained using normal fluid dynamic considerations under the assumption that viscous (and/or magnetic) transfer of mass and angular momentum from the inner to outer regions of these galaxies is efficient. The results are consistent with the flow of gas from the halo to the disk in regions that are close to the axis of rotation. The existence of rising rotation curves in some galaxies with varying gradients and flat rotation curves implies that these galaxies are not coeval. (R.R.)
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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ISSN:0004-640X
1572-946X
DOI:10.1007/BF00645993