The Lin–Shu type density–wave structure of the Galaxy: Line-of-sight velocities of selected 37354 RAVE DR5 stars |
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| Institution: | 1. Department of Physics, Ben-Gurion University, PO Box 653, Beer-Sheva 84105, Israel;2. Department of Physics, National Tsing-Hua University, Kuang-Fu Road 101, Hsin-Chu 30013, Taiwan;3. National Astronomical Observatories, Chinese Academy of Sciences, Jia-20, Beijing 100012, People’s Republic of China;4. Graduate Institute of Astronomy, National Central University, Jhong-Li 32001, Taiwan;1. Department of Mathematics, Sri Aurobindo College, University of Delhi, Delhi, India;2. Department of Physics, School of Science, Aristotle University of Thessaloniki, Thessaloniki GR-541 24, Greece;3. Department of Mathematics, Deshbandhu College, University of Delhi, Delhi, India;4. Department of Mathematics, ARSD College, University of Delhi, New Delhi, India;1. Institute of Space Technology, Institute of Space Technology, Islamabad, Pakistan;2. Australian Astronomical Observatory, NSW 1670, North Ryde, PO Box 915, Australia;3. Department of Phsyics and Astronomy, Western University, N6A 3K7,Ontario, London, Canada;1. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, PR China;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. P.G. Department of Mathematics, Berhampur University, Odisha, India;2. Department of Mathematics, NIST, Berhampur, Odisha, India;3. Department of Physics, U.P. Sc. College, Sheragada, Odisha, India;1. Department of Physics, Bu-Ali Sina University, Hamedan 65178, 016016, Iran;2. School of Astronomy, Institute for Research in Fundamental Sciences (IPM), 19395-5746 Tehran, Iran;3. CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | We exploit information, including velocities from the fifth data release of the RAdial Velocity Experiment (RAVE), to find evidence of the Lin–Shu type tightly wound spiral density waves in the nearby Galactic disk. The Kunder et al. (2017) catalogue of 471117 stars with derived spectrophotometric distances and line-of-sight velocities are explored to find the geometry and parameters of the velocity field in the extended solar neighborhood. Possible existence of noncircular systematic motions of selected 37,354 disk objects within 2 kpc from the Sun and 500 pc from the Galactic mid-plane together with the ordinary differential rotation are assumed. Both the pitch angle of spiral arms and the spatial location of the Sun within the density–wave pattern and the deviations of the motion of objects from the circular motion are calculated by fitting the stellar line-of-sight velocities in RAVE DR5 with the simplest linear perturbation density–wave model. Two radial wavelengths of the wave pattern of about 0.5 kpc and 1.5 kpc in the solar vicinity are found. We argue that the spiral structure of the Galaxy has an oscillating nature corresponding to a concept of the fairly unstable, low amplitude, tightly wound, and rigidly rotating density waves. |
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