Spectrum of Lin-Shu-type density waves in the galaxy: a number of discrete spiral modes of collective oscillations?
Measurements of great importance of photometric/trigonometric distances and velocities have recently done for 2859 open clusters and 103 masers associated with young high-mass stars in the disc of our Galaxy by Kharchenko et al. and Reid et al. We use these new high-precision data to determine the s...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
27 August 2015
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2015, Volume: 453, Issue: 2, Pages: 1981-1989 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stv1636 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stv1636
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| Author Notes: | Evgeny Griv, Nina V. Kharchenko, Anatoly E. Piskunov, Li-Gang Hou and Ing-Guey Jiang |
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| 245 | 1 | 0 | |a Spectrum of Lin-Shu-type density waves in the galaxy |b a number of discrete spiral modes of collective oscillations? |c Evgeny Griv, Nina V. Kharchenko, Anatoly E. Piskunov, Li-Gang Hou and Ing-Guey Jiang |
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| 520 | |a Measurements of great importance of photometric/trigonometric distances and velocities have recently done for 2859 open clusters and 103 masers associated with young high-mass stars in the disc of our Galaxy by Kharchenko et al. and Reid et al. We use these new high-precision data to determine the spectrum of Lin-Shu-type density waves in the system. The kinematics of 472 clusters and 65 masers selected within 4 kpc from the Sun is analysed on the assumption that the Galaxy is subject to moderately unstable, tightly-wound, small-amplitude density waves. For a given number of spiral arms, several minima of a least-squares estimator S of measured and predicted line-of-sight velocities of both clusters and masers with respect to the pitch angle p and the phase of the wave at the Sun's location are apparent from our calculation as |p| increases from 1° to 20°. The appearance of the minima of S is explained in terms of a number of discrete spiral modes of collective oscillations developing in the solar vicinity as suggested analytically by Lau, Lin & Mark, Bertin & Mark, Lau & Bertin and others in the late 1970s. | ||
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