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The Kinematically Measured Pattern Speeds of NGC 2523 and NGC 4245

Published online by Cambridge University Press:  01 August 2006

P. Treuthardt  and
R. Buta
P. Treuthardt
Affiliation:
Department of Physics & Astronomy, University of Alabama, Tuscaloosa, AL 35487, USA
R. Buta
Affiliation:
Department of Physics & Astronomy, University of Alabama, Tuscaloosa, AL 35487, USA
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Abstract

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We have applied the Tremaine-Weinberg method to the SB(r)b galaxy NGC 2523 and the SB(r)0/a galaxy NGC 4245 using the Calcium Triplet in order to determine their bar pattern speeds. Assuming an inclination of 53° and a distance of 49.5 Mpc, the pattern speed of NGC 2523 is 26.2 ± 6.1 km s−1 kpc−1. The pattern speed of NGC 4245 is 75.3 ± 31.2 km s−1 kpc−1, assuming an inclination of 35.4° and a distance of 12.7 Mpc. The ratio of the corotation radius to the bar radius of NGC 2523 and NGC 4245 is 1.3 ± 0.3 and 1.1 ± 0.5, respectively.

Keywords

galaxies: barsgalaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 145
Copyright
Copyright © International Astronomical Union 2007