The dynamical state of bars in cluster dwarf galaxies: The cases of NGC 4483 and NGC 4516

Abstract

Dwarf barred galaxies are the perfect candidates for hosting slowly-rotating bars. They are common in dense environments and they have a relatively shallow potential well, making them prone to heating by interactions. When an interaction induces bar formation, the bar should rotate slowly. They reside in massive and centrally-concentrated dark matter halos, which slow down the bar rotation through dynamical friction. While predictions suggest that slow bars should be common, measurements of bar pattern speed, using the Tremaine-Weinberg method, show that bars are mostly fast in the local Universe. We present a photometric and kinematic characterisation of bars hosted by two dwarf galaxies in the Virgo Cluster, NGC 4483 and NGC 4516. We derive the bar length and strength using the Next Generation Virgo Survey imaging and the circular velocity, bar pattern speed, and rotation rate using spectroscopy from the Multi Unit Spectroscopic Explorer. Including the previously studied galaxy IC 3167, we compare the bar properties of the three dwarf galaxies with those of their massive counterparts from literature. Bars in the dwarf galaxies are shorter and weaker, and rotate slightly slower with respect to those in massive galaxies. This could be due to a different bar formation mechanism and/or to a large dark matter fraction in the centre of dwarf galaxies. We show that it is possible to push the application of the Tremaine-Weinberg method to the galaxy low mass regime.

Accepted for publication in MNRAS

References in corpus (22)

• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. I. On the possible disk nature of bright early-type dwarfs
• The Dependence of Bar Frequency on Galaxy Mass, Colour, and Gas Content -- and Angular Resolution -- in the Local Universe
• The Extended Virgo Cluster Catalog
• Model-based pattern speed estimates for 38 barred galaxies
• Fluctuations in galactic bar parameters due to bar-spiral interaction
• A numerical study of interactions and stellar bars
• Modelling simple stellar populations in the near-ultraviolet to near-infrared with the X-shooter Spectral Library (XSL)
• Stellar mass distribution of S${}^4$G disk galaxies and signatures of bar-induced secular evolution
• Bar pattern speeds in CALIFA galaxies II. The case of weakly barred galaxies
• Bar pattern speeds in CALIFA galaxies III. Solving the puzzle of ultrafast bars
• 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
• On the accretion of a new group of galaxies onto Virgo: I. Internal kinematics of nine in-falling dEs
• Lopsided galactic bars
• Scaling relations for globular cluster systems in early-type galaxies. II. Is there an environmental dependence?
• A slow bar in the lenticular barred galaxy NGC 4277
• The Systematics of Galaxy Morphology in the Comprehensive de Vaucouleurs revised Hubble-Sandage Classification System: Application to the EFIGI Sample
• The bar rotation rate as a diagnostic of dark matter content in the centre of disc galaxies
• A slow lopsided bar in the interacting dwarf galaxy IC 3167
• The kinematics of σ-drop bulges from spectral synthesis modelling of a hydrodynamical simulation