Spiral stellar density waves and the flattening of abundance gradients in the warm gas component of spiral galaxies
- Autor(en)
- E. I. Vorobyov
- Abstrakt
Motivated by recent observations of plateaus and minima in the radial abundance distributions of heavy elements in the Milky Way and some other spiral galaxies, we propose a dynamical mechanism for the formation of such features around corotation. Our numerical simulations show that the non-axisymmetric gravitational field of spiral density waves generates cyclone and anticylone gas flows in the vicinity of corotation. The anticyclones flatten the pre-existing negative abundance gradients by exporting many more atoms of heavy elements outside corotation than importing inside it. This process is very efficient and forms plateaus of several kiloparsec in size around corotation after two revolution periods of a galaxy. The strength of anticyclones and, consequently, the sizes of plateaus depend on the pitch angle of spiral arms and are expected to increase along the Hubble sequence.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- University of Toronto, University of Western Ontario
- Journal
- Monthly Notices of the Royal Astronomical Society
- Band
- 370
- Seiten
- 1046-1054
- Anzahl der Seiten
- 9
- ISSN
- 0035-8711
- DOI
- https://doi.org/10.1111/j.1365-2966.2006.10550.x
- Publikationsdatum
- 08-2006
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103004 Astrophysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Space and Planetary Science
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/b6d12152-91c5-4bb4-8d83-cd2312210fbb