Bibcode
Kalinova, V.; van de Ven, Glenn; Lyubenova, Mariya; Falcón-Barroso, J.; Colombo, Dario; Rosolowsky, Erik
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 464, Issue 2, p.1903-1922
Fecha de publicación:
1
2017
Número de citas
15
Número de citas referidas
15
Descripción
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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