Other
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.177..357e&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 177, Nov. 1976, p. 357-375.
Other
29
Astronomical Models, Galactic Structure, Intergalactic Media, Magellanic Clouds, Mass Distribution, Milky Way Galaxy, Dynamic Models, Radial Velocity, Spatial Distribution
Scientific paper
The kinematics of the Magellanic Stream and other high-velocity clouds (HVCs) around the Galaxy is investigated to determine whether the HVCs are permanent companions of the Galaxy or members of the Local Group as a whole, whether the kinematics of the HVCs can reveal anything about the mass distribution around the Galaxy, and whether the HVCs can be used to estimate the total mass of the subcondensation of galaxies and intergalactic matter around the Galaxy. Evidence is presented to show that the HVCs and the companion galaxies of the Galaxy (the Magellanic Clouds, NGC 6822, and Sex A) probably form a gravitationally bound system, the Hypergalaxy, with a velocity dispersion of 80 to 90 km/s. The virial mass of the Hypergalaxy is estimated to be about 1.2 trillion solar masses, based on the kinematics of the HVCs and other high-velocity objects as well as the spatial distribution of the Galaxy's companions. Essential observed properties of the Magellanic Stream are found to be consistent with the hypothesis that the clouds in the Stream are moving aroung the Galaxy along elliptical orbits with a perigalactic distance of 14 kpc and an apogalactic distance of 100 kpc. The present study is shown to confirm the previously obtained result that large amounts of hidden mass must be present in systems of galaxies.
Einasto Jaan
Foeveer M.
Haud Urmas
Kaasik A. A.
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