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M51's spiral structure
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Howard, S. Byrd, Gene G. |
| Copyright Year | 1990 |
| Description | The M51 system (NGC 5194/5195) provides an excellent problem both in spiral structure and in galaxy interactions. The authors present an analytic study of a computer experiment on the excitation mechanisms for M51's spiral arms and whether or not a halo is important for these mechanisms. This work extends previous numerical studies of the M51 system by including self-gravitation in a two component disk: gas and stars, and a dark halo. The analytic study provides two new observational constraints: the time (approx. 70 to 84 million years ago) and position angle of perigalacticon (300 degrees). By using these constraints and a simple conic approximation, the search for the companion's possible orbit is greatly simplified. This requires fewer N-body simulations than a fully self-gravitating orbit search. |
| File Size | 1997278 |
| Page Count | 5 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910007625 |
| Archival Resource Key | ark:/13960/t3cz8480z |
| Language | English |
| Publisher Date | 1990-11-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Galactic Structure Interacting Galaxies Gravitation Halos Approximation Conics Mass Distribution Orbits Computerized Simulation Excitation Spiral Galaxies Many Body Problem Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
