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The nearby spiral density-wave structure of the Galaxy: line-of-sight and longitudinal velocities of 223 Cepheids
Griv, Evgeny1; Hou, Li-Gang2; Jiang, Ing-Guey3; Ngeow, Chow-Choong4
2017-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume464Issue:4Pages:4495-4508
AbstractThe data of 223 stars within 4 kpc from the Sun and 400 pc from the plane are collected from Melnik et al., who listed photometric distances and velocities of 674 long-period Cepheids in the disc of our Galaxy. Both line-of-sight and transverse along the Galactic longitude velocities of the selected stars are analysed on the assumption that the system is the subject to Lin-Shutype moderately unstable, low-amplitude, tightly wound and rigidly rotating density waves. Minimization of the least-squares estimator S of measured and modelled velocities of stars was performed in the geometrical parameters of waves. The wave structures defined from the two independent samples of velocities are nearly similar. Different radial scales (wavelengths) of velocity inhomogeneity of about 1, 2 and 4 kpc, which do not depend on the number of spiral arms m, were found. But for now it is unclear if one can identify these scales as fully independent global modes of collective oscillations or they are Fourier harmonics of a single wave, or they just reveal the segments of large-scale Orion, Sagittarius and Perseus arms. The dominant mode is the one-armed wave for the main minimum of all S considered. However, because the S values for fits with m = 1-4 are almost equal the latter conclusion must be regarded as tentative until more extensive data are available. High-precision Gaia observations could reveal in the near future whether the wave-like velocity fluctuations near the Sun reported here do indeed exist.
SubtypeArticle
KeywordGalaxy: Kinematics And Dynamics Galaxy: Structure Galaxies: Spiral
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationIsraeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israel Science Foundation ; Israel Science Foundation ; Binational US-Israel Science Foundation ; Binational US-Israel Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Council in Taiwan ; National Science Council in Taiwan ; Israeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israel Science Foundation ; Israel Science Foundation ; Binational US-Israel Science Foundation ; Binational US-Israel Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Council in Taiwan ; National Science Council in Taiwan
DOI10.1093/mnras/stw2674
WOS KeywordSTAR-FORMING REGIONS ; PERIOD-AGE RELATION ; MILKY-WAY GALAXY ; TRIGONOMETRIC PARALLAXES ; DISK GALAXIES ; STELLAR KINEMATICS ; GALACTIC ROTATION ; LOCAL STANDARD ; HIPPARCOS DATA ; PROPER MOTION
Indexed BySCI
Language英语
Funding OrganizationIsraeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israel Science Foundation ; Israel Science Foundation ; Binational US-Israel Science Foundation ; Binational US-Israel Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Council in Taiwan ; National Science Council in Taiwan ; Israeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israeli Ministry of Immigrant Absorption through a fellowship within the programme 'KAMEA' ; Israel Science Foundation ; Israel Science Foundation ; Binational US-Israel Science Foundation ; Binational US-Israel Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Science Council in Taiwan ; National Science Council in Taiwan
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000393780500052
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8243
Collection射电天文研究部
Affiliation1.Ben Gurion Univ Negev, Dept Phys, POB 653, IL-84105 Beer Sheva, Israel
2.Chinese Acad Sci, Natl Astron Observ, Da Tun Rd,Jia 20, Beijing 100012, Peoples R China
3.Natl Tsing Hua Univ, Dept Phys, Kuang Fu Rd 101, Hsinchu 30013, Taiwan
4.Natl Cent Univ, Grad Inst Astron, Jhongli 32001, Taiwan
Recommended Citation
GB/T 7714
Griv, Evgeny,Hou, Li-Gang,Jiang, Ing-Guey,et al. The nearby spiral density-wave structure of the Galaxy: line-of-sight and longitudinal velocities of 223 Cepheids[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,464(4):4495-4508.
APA Griv, Evgeny,Hou, Li-Gang,Jiang, Ing-Guey,&Ngeow, Chow-Choong.(2017).The nearby spiral density-wave structure of the Galaxy: line-of-sight and longitudinal velocities of 223 Cepheids.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,464(4),4495-4508.
MLA Griv, Evgeny,et al."The nearby spiral density-wave structure of the Galaxy: line-of-sight and longitudinal velocities of 223 Cepheids".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 464.4(2017):4495-4508.
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