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Dragging force on galaxies due to streaming dark matter
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hara, Tetsuya Miyoshi, Shigeru |
| Copyright Year | 1990 |
| Description | It has been reported that galaxies in large regions (approx. 10(exp 2) Mpc), including some clusters of galaxies, may be streaming coherently with velocities up to 600 km/sec or more with respect to the rest frame determined by the microwave background radiation. On the other hand, it is suggested that the dominant mass component of the universe is dark matter. Because we can only speculate the motion of dark matter from the galaxy motions, much attention should be paid to the correlation of velocities between the observed galaxies and cold dark matter. So the authors investigated whether such coherent large-scale streaming velocities are due to dark matter or only to baryonic objects which may be formed by piling up of gases due to some explosive events. It seems that, although each galaxy will not follow the motion of dark matter, clusters of galaxies may represent the velocity field of dark matter. The origin of the velocity field of dark matter would be due to the initial adiabatic perturbations and, in fact, the observed peculiar velocities of clusters are within the allowed region constrained from the isotropy of the microwave background radiation. |
| File Size | 348469 |
| Page Count | 5 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910007634 |
| Archival Resource Key | ark:/13960/t49p7zb09 |
| Language | English |
| Publisher Date | 1990-11-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Galactic Clusters Drag Dark Matter Galaxies Universe Perturbation Velocity Distribution Background Radiation Microwaves Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
