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Bar strengths in early-type disk galaxies

Published online by Cambridge University Press:  01 July 2007

R. Buta
Affiliation:
Dept. of Physics & Astronomy, University of Alabama, Tuscaloosa, AL, 35487, USA email: rbuta@bama.ua.edu
E. Laurikainen
Affiliation:
Division of Astronomy, Department of Physical Sciences, University of Oulu, FIN-90014, Finland
H. Salo
Affiliation:
Division of Astronomy, Department of Physical Sciences, University of Oulu, FIN-90014, Finland
J. H. Knapen
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Spain
D. L. Block
Affiliation:
School of Computational and Applied Mathematics, University of the Witwatersrand, Private Bag 3, WITS 2050South Africa
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Abstract

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Using the gravitational torque indicator Qb, we derive the distribution of bar strengths for a sample of early-type disk galaxies. The sample is part of the Near-Infrared S0 Survey (NIRS0S), designed to examine the properties of bars, bulges, and disks in galaxies classified as types S0 to Sa. Although the survey is only partly finished, we find that the distribution of bar strengths in S0 galaxies differs from that in spirals by lacking an extended tail to high values of Qb. No S0 in our current sample has Qb > 0.25, while spirals extend to Qb ≈ 0.7. Bars having Qb > 0.25 first appear among S0/a to Sa galaxies.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Block, D. L. et al. 2002, A&A 394, L35Google Scholar
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