SIMBAD references

2017MNRAS.464.1903K - Mon. Not. R. Astron. Soc., 464, 1903-1922 (2017/January-2)

The inner mass distribution of late-type spiral galaxies from SAURON stellar kinematic maps.

KALINOVA V., VAN DE VEN G., LYUBENOVA M., FALCON-BARROSO J., COLOMBO D. and ROSOLOWSKY E.

Abstract (from CDS):

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. /σ_R is locally greater than 1.5. Below this value, the ratio v_c, JAM/vc, ADC_ gradually increases with decreasing /σ_R, reaching vc,JAM ≃ 2 x v_c, 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.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): methods: analytical - methods: statistical - galaxies: bulges - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure - galaxies: structure

Simbad objects: 18

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