+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Byrd, G. G.  Author > Miller, R. H.  Author > Smith, B. F.  NASA Center > Ames Research Center  Publication Year > 1981-1990 > 1984  Subject > A-C > Astrophysics  Availability Options > Order From Other Sources  Item/Media Type > Journal Article  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: Gravitational spurs and resonances - Effects of small mass disturbers in spiral galaxy disks Author(s): Byrd, G. G.; Smith, B. F.; Miller, R. H. Abstract: In the present simulations of a disturber in a complete stellar disk without the restrictive assumption, the disturber parameters of the NGC 206 cloud in M 31 were assumed as a realistic example. The resulting spur around the disturber was comparable in shape, size, and strength to Julian and Toomre's (1966) results. In addition, a complicated evolving pattern of strong density peaks appeared well inside and outside the disturber's orbit. Simulation with a ten-times-more-massive disturber showed a more clearly defined version of the same initial pattern, two spiral arms of density peaks rotating with the disturber in the stronger arm. The orbital radii of the density peaks correspond to those of epicyclic resonances with the orbiting disturber potential. NASA Center: Ames Research Center Publication Date: Nov 1, 1984 Document Source: Other Sources No Digital Version Available: Go to Tips On Ordering Document ID: 19850036032 Accession ID: 85A18183 Publication Information: Astrophysical Journal, Part 1, 286, 62-67, ISSN 0004-637X, Number of Pages = 6 Related Information: Research supported by the University of Alabama and American Astronomical Society Keywords: ASTRONOMICAL MODELS; GALACTIC STRUCTURE; GRAVITATIONAL EFFECTS; GRAVITATIONAL FIELDS; MASS DISTRIBUTION; SPIRAL GALAXIES; ANDROMEDA GALAXY; COSMIC GASES; GALACTIC EVOLUTION; MOLECULAR CLOUDS; ORBITAL ELEMENTS; RADII; Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 62-67. Research supported by the University of Alabama and American Astronomical Society. Accessibility: Unclassified; Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2004-11-03 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007