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The puzzle of unbarred galaxies

Published online by Cambridge University Press:  14 May 2020

Juntai Shen Open the ORCID record for Juntai Shen [Opens in a new window]
Juntai Shen*
Affiliation:
Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai200240, China email: [email protected] Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai200030, China College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing100049, China
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Abstract

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Nearly two thirds of spiral galaxies are either strongly or weakly barred, yet a significant fraction of disc galaxies do not have a bar. Now we understand that there are at least three ways of making bars, i.e., bar instability, tidal interaction, and secular bar growth by orbit trapping of a seed bar. However, the reverse problem of avoiding bar formation in unbarred galaxies may be more challenging than we thought. It is shocking that we still do not understand how the bar instability is avoided in real galaxies such as M33, and this puzzle may be central to the outstanding issue of what determines the distribution of bar strengths in galaxies.

Keywords

galaxies: evolutiongalaxies: kinematics and dynamicsgalaxies: spiral
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S353: Galactic Dynamics in the Era of Large Surveys , June 2019 , pp. 154
Copyright
© International Astronomical Union 2020

References

Sellwood, J. A., Shen, J., & Li, Z. 2019, MNRAS, 486, 471010.1093/mnras/stz1145CrossRefGoogle Scholar