A slow bar in the dwarf irregular galaxy NGC 3741

Abstract

Using the Tremaine-Weinberg method, we measure the speed of the HI bar seen in the disk of NGC 3741. NGC 3741 is an extremely gas rich galaxy with an {H\,{\sc i}} disk which extends to about 8.3 times its Holmberg radius. It is also highly dark matter-dominated. Our calculated value of the pattern speed ${\Omega }_p$ is 17.1 $\pm$ 3.4 km ${\text{s}}^{-1}{\text{kpc}}^{-1}$. We also find the ratio of the co-rotation radius to the bar semi-major axis to be (1.6 $\pm$ 0.3), indicating a slow bar. This is consistent with bar models in which dynamical friction results in a slow bar in dark matter dominated galaxies.

7 pages, 4 figures, 2 tables Accepted for publlication in MNRAS

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• Simulating a slow bar in the low surface brightness galaxy UGC 628
• Bar properties and photometry of barred low surface brightness disc galaxies
• The Net Radial Flow Velocity of the Neutral Hydrogen in the Oval Distortion of NGC 4736
• Characterising bars in low surface brightness galaxies
• On the Tremaine-Weinberg method: how much can we trust gas tracers to measure pattern speeds?
• The Smallest Scale of Hierarchy Survey (SSH). II. Extended star formation and bar-like features in the dwarf galaxy NGC 3741: recent merger or ongoing gas accretion?
• HI 21 cm observation and mass models of the extremely thin galaxy FGC 1440