The pattern speed of the bar in NGC 4596

Details The pattern speed of the bar in NGC 4596 The pattern speed of the bar in NGC 4596

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.306..926g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 306, Issue 4, pp. 926-930.

Astronomy and Astrophysics

Astronomy

47

Scientific paper

The pattern speed is a defining parameter of any barred galaxy. A large number of model-dependent techniques have therefore been developed to derive the pattern speed. However, the only model-independent technique for measuring this quantity - the Tremaine-Weinberg method - has hitherto been applied to just one case, the SB0 galaxy NGC 936. In this paper, we apply the technique to a second system, the SBa galaxy NGC 4596. The resulting estimate for the pattern speed is Omega_p=52+/-13kms^-1kpc^-1. This result is corroborated by a spectrum obtained along the major axis of the bar in this system. The corotation radius associated with this pattern speed lies just beyond the end of the bar indicating a fast bar. Combining the bar major-axis spectra with data obtained from a Hubble Space Telescope WFPC2 image, we also find strong evidence for a nuclear disc.

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