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Density Wave Theory with Co-rotation May Have a Critical Problem
Version 1
: Received: 13 July 2023 / Approved: 14 July 2023 / Online: 14 July 2023 (13:08:30 CEST)
How to cite: Pan, H. Density Wave Theory with Co-rotation May Have a Critical Problem. Preprints 2023, 2023071019. https://doi.org/10.20944/preprints202307.1019.v1 Pan, H. Density Wave Theory with Co-rotation May Have a Critical Problem. Preprints 2023, 2023071019. https://doi.org/10.20944/preprints202307.1019.v1
Abstract
The Density Wave Theory, which aims to explain the formation of spiral arms in disc galaxies, has been subject to discussion. According to this theory, at the co-rotation circle, the rotational velocity of the density waves or spiral arms matches that of the galactic matter. Consequently, this alignment should impede the formation of new stars within this co-rotation circle, leading to the presence of dark or dim gaps within the spiral arms. Additionally, the theory predicts the occurrence of the front side trail effect in the inner region of the co-rotation circle and the rear side trail effect in the outer region. However, despite these expectations, no such spiral patterns have been observed, prompting the need for revision or reconsideration of the Density Wave Theory.
Keywords
Density wave theory; co-rotation; spiral arms; spiral arm dark gaps; trail effects
Subject
Physical Sciences, Astronomy and Astrophysics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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