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  Orbital decomposition of CALIFA spiral galaxies

Zhu, L., van den Bosch, R., van de Ven, G., Lyubenova, M., Falcón-Barroso, J., Meidt, S. E., et al. (2018). Orbital decomposition of CALIFA spiral galaxies. Monthly Notices of the Royal Astronomical Society, 473, 3000-3018.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CA14-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CA15-0
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.473.3000Z (Any fulltext)
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 Creators:
Zhu, Ling1, Author
van den Bosch, Remco1, Author
van de Ven, Glenn1, Author
Lyubenova, Mariya1, Author
Falcón-Barroso, Jesús1, Author
Meidt, Sharon E.1, Author
Martig, Marie1, Author
Shen, Juntai1, Author
Li, Zhao-Yu1, Author
Yildirim, Akin1, Author
Walcher, C. Jakob1, Author
Sanchez, Sebastian F.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: methods: numerical surveys galaxies: kinematics and dynamics galaxies: spiral Astrophysics - Astrophysics of Galaxies
 Abstract: Schwarzschild orbit-based dynamical models are widely used to uncover the internal dynamics of early-type galaxies and globular clusters. Here we present for the first time the Schwarzschild models of late-type galaxies: an SBb galaxy NGC 4210 and an S0 galaxy NGC 6278 from the Calar Alto Legacy Integral Field Area (CALIFA) survey. The mass profiles within 2Re are constrained well with 1σ statistical error of ∼ 10 per cent. The luminous and dark mass can be disentangled with uncertainties of ∼20 and ∼ 50 per cent, respectively. From Re to 2Re, the dark matter fraction increases from 14 ± 10 to 18 ± 10 per cent for NGC 4210 and from 15 ± 10 to 30 ± 20 per cent for NGC 6278. The velocity anisotropy profiles of both σr/σt and σz/σR are well constrained. The inferred internal orbital distributions reveal clear substructures. The orbits are naturally separated into three components: a cold component with near circular orbits; a hot component with near radial orbits and a warm component in between. The photometrically identified exponential discs are predominantly made up of cold orbits only beyond ∼1Re, while they are constructed mainly with the warm orbits inside. Our dynamical hot components are concentrated in the inner regions, similar to the photometrically identified bulges. The reliability of the results, especially the orbit distribution, is verified by applying the model to mock data.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 473 Sequence Number: - Start / End Page: 3000 - 3018 Identifier: -