Dynamical Modeling of Galaxies and Supermassive Black Holes: Axisymmetry in Triaxial Schwarzschild Orbit Superposition Models
Autor: | Chung-Pei Ma, Matthew E. Quenneville, Christopher M. Liepold |
---|---|
Rok vydání: | 2021 |
Předmět: |
Physics
Orbit modeling Supermassive black hole 010308 nuclear & particles physics FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Space and Planetary Science Primary (astronomy) Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Elliptical galaxy Galaxy formation and evolution Orbit (dynamics) Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Schwarzschild radius Astrophysics::Galaxy Astrophysics |
Zdroj: | The Astrophysical Journal Supplement Series. 254:25 |
ISSN: | 1538-4365 0067-0049 |
Popis: | We present a detailed analysis of the behavior of the triaxial Schwarzschild orbit superposition method near the axisymmetric limit. Orbit superposition modeling is the primary method used to determine dynamical masses of supermassive black holes ($M_\mathrm{BH}$) in nearby galaxies; however, prior studies have reported conflicting results when comparing the outcome from axisymmetric orbit codes with that from a triaxial orbit code in the axisymmetric limit. We show that in order to achieve (oblate) axisymmetry in a triaxial code, care needs to be taken to axisymmetrize the short-axis tube orbits and to exclude both the long-axis tube and box orbits from the orbit library. Using up to 12 Gauss-Hermite moments of the line-of-sight velocity distributions as constraints, we demonstrate the effects of orbit types on the best-fit $M_\mathrm{BH}$ in orbit modeling of the massive elliptical galaxy NGC 1453 reported in Liepold et al. 2020. In addition, we verify the efficacy of our updated code on a mock galaxy dataset. We identify a subset of slowly precessing quasi-planar orbits for which the typical integration times can be insufficient to fully capture the equilibrium orbital behavior in both axisymmetric and triaxial systems with central black holes. Further investigation is needed for a more reliable treatment of these orbits. 19 pages, 7 figures. Accepted for publication in ApJ |
Databáze: | OpenAIRE |
Externí odkaz: |