The bar rotation rate as a diagnostic of dark matter content in the centre of disc galaxies

Abstract

We investigate the link between the bar rotation rate and dark matter content in barred galaxies by concentrating on the cases of the lenticular galaxies NGC4264 and NGC4277. These two gas-poor galaxies have similar morphologies, sizes, and luminosities. But, NGC4264 hosts a fast bar, which extends to nearly the corotation, while the bar embedded in NGC4277 is slow and falls short of corotation. We derive the fraction of dark matter $f_{\mathrm{DM},\mathrm{bar}}$ within the bar region from Jeans axisymmetric dynamical models by matching the stellar kinematics obtained with the MUSE integral-field spectrograph and using SDSS images to recover the stellar mass distribution. We build mass-follows-light models as well as mass models with a spherical halo of dark matter, which is not tied to the stars. We find that the inner regions of NGC4277 host a larger fraction of dark matter ($f_{\mathrm{DM},\mathrm{bar}}=0.53\pm 0.02$) with respect to NGC4264 ($f_{\mathrm{DM},\mathrm{bar}}=0.33\pm 0.04$) in agreement with the predictions of theoretical works and the findings of numerical simulations, which have found that fast bars live in baryon-dominated discs, whereas slow bars experienced a strong drag from the dynamical friction due to a dense DM halo. This is the first time that the bar rotation rate is coupled to $f_{\mathrm{DM},\mathrm{bar}}$ derived from dynamical modelling.

Accepted for publication on MNRAS, 12 pages

References in corpus (27)

• The NumPy array: a structure for efficient numerical computation
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time
• Measuring the inclination and mass-to-light ratio of axisymmetric galaxies via anisotropic Jeans models of stellar kinematics
• Dynamical modelling of the Galactic bulge and bar: the Milky Way's bar pattern speed, stellar, and dark matter mass distribution
• A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
• The population of barred galaxies in the local universe I. Detection and characterisation of bars
• The PHANGS-MUSE survey -- Probing the chemo-dynamical evolution of disc galaxies
• Properties of Bars and Bulges in the Hubble Sequence
• The mass distribution in early-type disk galaxies: declining rotation curves and correlations with optical properties
• The Extended Virgo Cluster Catalog
• NMAGIC: Fast Parallel Implementation of a Chi-Squared-Made-to-Measure Algorithm for Modelling Observational Data
• Two-dimensional multi-component photometric decomposition of CALIFA galaxies
• Fast galaxy bars continue to challenge standard cosmology
• Revisiting the tension between fast bars and the $\Lambda$CDM paradigm
• A numerical study of interactions and stellar bars
• A new implementation of the Schwarzschild method for constructing observationally-driven dynamical models of galaxies of all morphological types
• Relations among structural parameters in barred galaxies with a direct measurement of bar pattern speed
• SDSS-IV MaNGA: Bar pattern speed estimates with the Tremaine-Weinberg method and their error sources
• Applying the Tremaine-Weinberg Method to Nearby Galaxies: Stellar Mass-Based Pattern Speeds, and Comparisons with ISM Kinematics
• SDSS IV MaNGA: Bar pattern speed in Milky Way Analogue galaxies
• Evidence of a fast bar in the weakly-interacting galaxy NGC 4264 with MUSE
• Orbit-Superposition Dynamical Modeling of Barred Galaxies
• A slow bar in the lenticular barred galaxy NGC 4277
• The diversity of spiral galaxies explained
• Numerical simulations of bar formation in the Local Group

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