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arXiv · 1709.06649

Orbital decomposition of CALIFA spiral galaxies

Ling Zhu·Remco van den Bosch·Glenn van de Ven·Mariya Lyubenova·Jesús Falcón-Barroso·Sharon E. Meidt·Marie Martig·Juntai Shen·Zhao-Yu Li·Akin Yildirim·C. Jakob Walcher·Sebastian F. Sanchez
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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 CALIFA survey. The mass profiles within $2\,R_e$ are constrained well with $1σ$ statistical error of $\sim 10\%$. The luminous and dark mass can be disentangled with uncertainties of $\sim 20\%$ and $\sim 50\%$ respectively. From $R_e$ to $2\,R_e$, the dark matter fraction increases from $14\pm10\%$ to $18\pm10\%$ for NGC 4210 and from $15\pm10\%$ to $30\pm20\%$ for NGC 6278. The velocity anisotropy profiles of both $σ_r/σ_t$ and $σ_z/σ_R$ 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 disks are predominantly made up of cold orbits only beyond $\sim 1\,R_e$, 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, are verified by applying the model to mock data.

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Ling Zhu, Remco van den Bosch, Glenn van de Ven, Mariya Lyubenova, Jesús Falcón-Barroso, Sharon E. Meidt, Marie Martig, Juntai Shen, Zhao-Yu Li, Akin Yildirim, C. Jakob Walcher, Sebastian F. Sanchez. 2017-09-19. Orbital decomposition of CALIFA spiral galaxies. https://doi.org/10.1093/mnras%2Fstx2409

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