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The dynamics of long-lived spiral arms
EPJ Web of Conferences, 2012 It has been believed that spiral arms in pure stellar disks decay in several galactic rotations due to the heating by the spiral arms. However, it might be caused by a numerical heating.
Wada K. +5 more
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, 2022 The most important theory of the spiral arms of galaxies is the density wave theory based on the Lin-Shu dispersion relation. However, the density waves move with the group velocity towards the inner Lindblad resonance and tend to disappear. Various mechanisms to replenish the spiral waves have been proposed.
Contopoulos, George
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Spiral Arms Around a Star: Geometric Explanation [PDF]
, 2022 Recently, astronomers discovered spiral arms around a star. While their shape is similar to the shape of the spiral arms in the galaxies, however, because of the different scale, galaxy-related physical explanations of galactic spirals cannot be directly
Puebla, Juan L., Kreinovich, Vladik
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Magnetic spiral arms in galaxies
Large-scale magnetic fields in spiral galaxies are strongest in spiral-shaped regions, the magnetic arms. It was recently discovered for the galaxy NGC 6946 that magnetic arms can be interlaced with the gaseous arms, rather than coinciding with them ...
Shukurov A
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Magnetic spiral arms and galactic outflows [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2014 AbstractGalactic magnetic arms have been observed between the gaseous arms of some spiral galaxies; their origin remains unclear. We suggest that magnetic spiral arms can be naturally generated in the interarm regions because the galactic fountain flow or wind is likely to be weaker there than in the arms.
Chamandy L, Shukurov A, Subramanian K
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Milky Way spiral arms from open clusters in Gaia EDR3 [PDF]
, 2021 Context. The physical processes driving the formation of Galactic spiral arms are still under debate. Studies using open clusters favour the description of the Milky Way spiral arms as long-lived structures following the classical density wave theory ...
Castro Ginard, Alfred +9 more
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MOLECULAR DISTRIBUTION IN THE SPIRAL ARM OF M51 [PDF]
The Astrophysical Journal, 2016 ABSTRACT Molecular line images of 13CO, C18O, CN, CS, CH3OH, and HNCO are obtained toward the spiral arm of M51 at a resolution with the Combined Array for Research in Millimeter-wave Astronomy.
Watanabe, Yoshimasa +4 more
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Bulletin of the Seismological Society of America, 2015 Seismic arrays have many uses for signal enhancement, from surface-wave characterization of the near surface to teleseismic detection in the context of monitoring nuclear tests. Many variants of the geometrical configuration of stations have been used with the objective of maximizing potential resolution of the incoming wavefronts di- rection of ...
Kennett, Brian +2 more
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PITCH ANGLE OF GALACTIC SPIRAL ARMS [PDF]
The Astrophysical Journal, 2014 17 pages, 8 figures, accepted for publication in ...
Michikoshi, Shugo, Kokubo, Eiichiro
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Kinematics of the Local Spiral Structure Revealed by Young Stars in Gaia DR3
The Astrophysical Journal Supplement Series, 2023 Using young open clusters and O–B2-type stars in Gaia Data Release 3, we investigate the kinematics of the local spiral structure. In general, the young sources in the outer spiral arms may present larger peculiar motions than those in the inner spiral ...
Dejian Liu +6 more
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