The effect of dust on Tremaine-Weinberg measurements

Abstract

We investigate the effect of dust on the observed rotation rate of a stellar bar. The only direct way to measure this quantity relies on the Tremaine & Weinberg method which requires that the tracer satisfies the continuity equation. Thus it has been applied largely to early-type barred galaxies. We show using numerical simulations of barred galaxies that dust attenuation factors typically found in these systems change the observed bar pattern speed by 20-40 percent. We also address the effect of star formation on the TW method and find that it does not change the results significantly. The results presented here suggest that applications of the TW method can be extended to include barred galaxies covering the full range of Hubble type.

arXiv comment10 pages, 7 figures. Accepted for publication in MNRAS

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• Kinematic analysis of nuclear spirals: feeding the black hole in NGC1097
• Bar pattern speeds in CALIFA galaxies II. The case of weakly barred galaxies
• Quantifying Resonant Structure in NGC 6946 from Two-dimensional Kinematics
• Tests of the Radial Tremaine-Weinberg Method
• Relations among structural parameters in barred galaxies with a direct measurement of bar pattern speed
• Galaxy Zoo: Kinematics of strongly and weakly barred galaxies
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• Bar pattern speeds in CALIFA galaxies III. Solving the puzzle of ultrafast bars
• Evidence of a fast bar in the weakly-interacting galaxy NGC 4264 with MUSE
• Simulations of star forming main sequence galaxies in Milgromian gravity
• Dynamical Simulations of NGC 2523 and NGC 4245
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• On the Tremaine-Weinberg method: how much can we trust gas tracers to measure pattern speeds?
• The Tremaine-Weinberg method at high redshifts
• Bulge properties and dark matter content of early-type barred galaxies