Bibcode
Kalinova, V.; van de Ven, Glenn; Lyubenova, Mariya; Falcón-Barroso, J.; Colombo, Dario; Rosolowsky, Erik
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 464, Issue 2, p.1903-1922
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1
2017
Citations
15
Refereed citations
15
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.
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Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
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