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Stationary orbits of satellites of disk galaxies
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Polyachenko, Valerij L. |
| Copyright Year | 1990 |
| Description | The satellite of an S-galaxy will experience opposing dynamical-friction forces from the stars of the disk and the halo. If these forces are in balance, the satellite may travel in a stable, near-circular orbit whose radius, for a wide range of physical parameters, should be limited to a zone 1.2 to 1.4 times the disk radius, much as is observed. The idea is very simple. The dynamical friction acting on a small satellite, moving through a stellar galactic halo, makes this satellite slow down. On the other hand, a stellar disk, rotating faster than a satellite, makes it speed up. But the density distributions in radius for disk's and halo's stars in real flat galaxies are quite different (respectively, exponential and power-law). Moreover, the observational data show that the exponential profile for disk's surface density drops abruptly at some radius (r sub d). So it is natural to expect that a stationary orbit could be near the edge of a disk (where two effects are mutually compensated). |
| File Size | 256451 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910007641 |
| Archival Resource Key | ark:/13960/t58d4tb2p |
| Language | English |
| Publisher Date | 1990-11-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Halos Stability Friction Radii Stars Natural Satellites Angular Momentum Disk Galaxies Density Distribution Rotation Stationary Orbits Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
