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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz

IMPACT FACTOR 2018: 0.350

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Volume 27, Issue 1


Multiarm spirals on the periphery of disc galaxies

Spiegel Lubov
  • Corresponding author
  • Institute of Astronomy, Russian Academy of Sciences, 48 Pyatnitskya St., Moscow 119017, Russian Federation
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/ Polyachenko Evgeny
Published Online: 2018-04-21 | DOI: https://doi.org/10.1515/astro-2018-0003


Spiral patterns in some disc galaxies have two arms in the centre, and three or more arms on the periphery. The same result is also obtained in numerical simulations of stellar and gaseous discs.We argue that such patterns may occur due to fast cooling of the gas, resulting in formation of giant molecular clouds. The timescale of this process is 50 Myr, the factor of 10 shorter than of ordinary secular instability. The giant molecular clouds give rise to multiarm spirals through the mechanism of swing amplification.

Keywords : galaxies: spirals


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About the article

Received: 2017-10-09

Accepted: 2017-12-18

Published Online: 2018-04-21

Citation Information: Open Astronomy, Volume 27, Issue 1, Pages 70–74, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2018-0003.

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© 2018, published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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