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Spiral density-wave structure parameters in the solar neighbourhood derived from longitudinal velocities of Gaia EDR3 OB stars: 3D approach

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dc.abstract.enDistances and transverse along the Galactic longitude velocities v<SUB>l</SUB> of 2640 Gaia EDR3 O-B2 stars of Xu et al. within 2.5 kpc from the Sun and 250 pc from the Galactic plane with relative distance and velocity accuracies of <10 and <50 per cent are selected. Under the assumption of spiral density waves, both Galactic differential rotation parameters and parameters of the wave structure in this solar neighbourhood are derived from observed v<SUB>l</SUB>. In contrast to all preceding studies, we take into account the effect of small but finite thickness of the disc of the Galaxy on even parity ('sausage') gravity perturbations of the kind investigated by Lin and Shu. As previously predicted by the modified theory of 3D density waves, two scales of periodic rarefaction-compression irregularity of the v<SUB>l</SUB> velocity field with the radial λ<SUB>0</SUB> ≍ 1.5 kpc and vertical ξ<SUB>0</SUB> ≍ 1.0 kpc wavelengths in the form of a spiral wave propagating in the disc are revealed. The Gaia's DR2 line-of-sight and EDR3 longitudinal velocities analyses performed in the last papers of a series exhibit consistent findings, thus providing a further evidence to support the Lin-Shu density-wave proposal.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorLiu, De-Jian
dc.contributor.authorGedalin, Michael
dc.contributor.authorJiang, Ing-Guey
dc.contributor.authorGriv, Evgeny
dc.contributor.authorMróz, Przemysław
dc.date.accessioned2024-01-26T07:57:02Z
dc.date.available2024-01-26T07:57:02Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.volume509
dc.identifier.doi10.1093/MNRAS/STAB2971
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/120393
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022MNRAS.509..463G
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages463-474
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleSpiral density-wave structure parameters in the solar neighbourhood derived from longitudinal velocities of Gaia EDR3 OB stars: 3D approach
dc.typeJournalArticle
dspace.entity.typePublication