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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742636.0, MPI für Astronomie / Publikationen_mpia
The inner mass distribution of late-type spiral galaxies from <monospace>SAURON</monospace> stellar kinematic maps
Authors:Kalinova, V.; van de Ven, G.; Lyubenova, M.; Falcón-Barroso, J.; Colombo, D.; Rosolowsky, E.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:2
Start Page:1903
End Page:1922
Audience:Not Specified
Abstract / Description:We infer the central mass distributions within 0.4-1.2 disc scalelengths of 18 late-type spiral galaxies using two different dynamical modelling approaches - the asymmetric drift correction (ADC) and axisymmetric Jeans anisotropic multi-Gaussian expansion (JAM) model. ADC adopts a thin-disc assumption, whereas JAM does a full line-of-sight velocity integration. We use stellar kinematics maps obtained with the integral-field spectrograph {SAURON} to derive the corresponding circular velocity curves from the two models. To find their best-fitting values, we apply the Markov Chain Monte Carlo (MCMC) method. ADC and JAM modelling approaches are consistent within 5 per cent uncertainty when the ordered motions are significant comparable to the random motions, i.e. overline{v_{φ }}/σ _R is locally greater than 1.5. Below this value, the ratio vc, JAM/vc, ADC gradually increases with decreasing overline{v_{φ }}/σ _R, reaching vc,JAM ≈ 2 × vc, ADC. Such conditions indicate that the stellar masses of the galaxies in our sample are not confined to their disc planes and likely have a non-negligible contribution from their bulges and thick discs.
Free Keywords:methods: analytical; methods: statistical; galaxies: bulges; galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stw2448
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