Mapping the dark matter halo of early-type galaxy NGC 2974 through orbit-based models with combined stellar and cold gas kinematics
| Autor: | Anne-Marie Weijmans, Meng Yang, Raffaella Morganti, Tom Oosterloo, Nicholas Fraser Boardman, Glenn van de Ven, Ling Zhu |
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| Přispěvatelé: | Astronomy, University of St Andrews. School of Physics and Astronomy, University of St Andrews. Centre for Contemporary Art |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
DYNAMICS
Stellar kinematics haloes [Galaxies] structure [Galaxies] Dark matter FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Kinematics Astrophysics MASS 01 natural sciences dark matter Gravitational potential 0103 physical sciences LARGE-SCALE STRUCTURE TO-LIGHT RATIO QB Astronomy Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics galaxies: kinematics and dynamics QB Physics ELLIPTIC GALAXY kinematics and dynamics [Galaxies] 010308 nuclear & particles physics DAS Astronomy and Astrophysics ATLAS(3D) PROJECT Astrophysics - Astrophysics of Galaxies SAURON PROJECT Galaxy Dark matter halo galaxies: haloes Orbit Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) MULTI-GAUSSIAN EXPANSION galaxies: structure Astrophysics::Earth and Planetary Astrophysics Schwarzschild radius NGC-2974 SYSTEM |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, 491(3), 4221-4231. Oxford University Press |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | We present an orbit-based method of combining stellar and cold gas kinematics to constrain the dark matter profile of early-type galaxies. We apply this method to early-type galaxy NGC 2974, using Pan-STARRS imaging and SAURON stellar kinematics to model the stellar orbits, and introducing HI kinematics from VLA observation as a tracer of the gravitational potential. The introduction of the cold gas kinematics shows a significant effect on the confidence limits of especially the dark halo properties: we exclude more than $95\%$ of models within the $1-\sigma$ confidence level of Schwarzschild modelling with only stellar kinematics, and reduce the relative uncertainty of the dark matter fraction significantly to $10\%$ within $5 R_\mathrm{e}$. Adopting a generalized-NFW dark matter profile, we measure a shallow cuspy inner slope of $0.6^{+0.2}_{-0.3}$ when including the cold gas kinematics in our model. We cannot constrain the inner slope with the stellar kinematics alone. Comment: 13 pages, 11 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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