The effect of dust on Tremaine-Weinberg measurements

Details The effect of dust on Tremaine-Weinberg measurements The effect of dust on Tremaine-Weinberg measurements

2007-03-23

arxiv.org/abs/astro-ph/0703615v1

Mon.Not.Roy.Astron.Soc.378:189-197,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.11761.x

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.

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