On the bar pattern speed determination of NGC 3367

Details On the bar pattern speed determination of NGC 3367 On the bar pattern speed determination of NGC 3367

2009-08-05

arxiv.org/abs/0908.0718v1

2009 ApJ 702, 392

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted for publication in ApJ. 16 pages, 16 figures

Scientific paper

10.1088/0004-637X/702/1/392

An important dynamic parameter of barred galaxies is the bar pattern speed. Among several methods that are used for the determination of the pattern speed the Tremaine-Weinberg method has the advantage of model independency and accuracy. In this work we apply the method to a simulated bar including gas dynamics and study the effect of 2D spectroscopy data quality on robustness of the method. We added a white noise and a Gaussian random field to the data and measured the corresponding errors in the pattern speed. We found that a signal to noise ratio in surface density ~5 introduces errors of ~20% for the Gaussian noise, while for the white noise the corresponding errors reach ~50%. At the same time the velocity field is less sensitive to contamination. On the basis of the performed study we applied the method to the NGC 3367 spiral galaxy using H{\alpha} Fabry-Perot interferometry data. We found for the pattern speed 43 \pm 6 km/s/kpc for this galaxy.

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