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Orbit properties of massive prolate galaxies in the Illustris simulation
- Publication Year :
- 2018
-
Abstract
- We explore orbit properties of 35 prolate-triaxial galaxies selected from the Illustris cosmological hydrodynamic simulation. We present a detailed study of their orbit families, and also analyse relations between the relative abundance of the orbit families and the spin parameter, triaxiality, the ratio of the angular momentum and the baryon fraction. We find that box orbits dominate the orbit structure for most prolate-triaxial galaxies, especially in the central region. The fraction of irregular orbits in the prolate-triaxial galaxies is small, and it increases with galaxy radius. Both the x-tube and z-tube orbits are important in prolate-triaxial galaxies, especially in the outer regions. The fraction of box orbits for prolate-triaxial galaxies ($0.7<br />Comment: 12 pages, 13 Figures; accepted to MNRAS
- Subjects :
- Physics
Angular momentum
010308 nuclear & particles physics
Nuclear Theory
FOS: Physical sciences
Astronomy and Astrophysics
Radius
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Astrophysics - Astrophysics of Galaxies
Galaxy
Physics::Geophysics
Baryon
Stars
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
0103 physical sciences
Orbit (dynamics)
Astrophysics::Earth and Planetary Astrophysics
010303 astronomy & astrophysics
Schwarzschild radius
Astrophysics::Galaxy Astrophysics
Spin-½
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....263cae950b7b4c0c05dfd2aae58954bc