Gaia-DR2 extended kinematical maps II. Dynamics in the Galactic disk explaining radial and vertical velocities
Lopez-Corredoira, M.1,2; Garzon, F.1,2; Wang, H. -F.3,4; Sylos Labini, F.5,6,7,8; Nagy, R.9; Chrobakova, Z.1,2; Chang, J.10,11; Villarroel, B.1,12
Corresponding AuthorLopez-Corredoira, M.(
AbstractContext. In our Paper I, by using statistical deconvolution methods, extended kinematics maps of Gaia-DR2 data have been produced in a range of heliocentric distances that are a factor of two to three larger than those analyzed previously by the Gaia Collaboration with the same data. It added the range of Galactocentric distances between 13 kpc and 20 kpc to the previous maps. Aims. Here, we investigate the dynamical effects produced by different mechanisms that can explain the radial and vertical components of these extended kinematic maps, including a decomposition of bending and breathing of the vertical components. This paper as a whole tries to be a compendium of different dynamical mechanisms whose predictions can be compared to the kinematic maps. Methods. Using analytical methods or simulations, we are able to predict the main dynamical factors and compare them to the predictions of the extended kinematic maps of Gaia-DR2. Results. The gravitational influence of Galactic components that are different from the disk, such as the long bar or bulge, the spiral arms, or a tidal interaction with Sagittarius dwarf galaxy, may explain some features of the velocity maps, especially in the inner parts of the disk. However, they are not sufficient in explaining the most conspicuous gradients in the outer disk. Vertical motions might be dominated by external perturbations or mergers, although a minor component may be due to a warp whose amplitude evolves with time. Here, we show with two different methods, which analyze the dispersion of velocities, that the mass distribution of the disk is flared. Despite these partial explanations, the main observed features can only be explained in terms of out-of-equilibrium models, which are either due to external perturbers or to the fact that the disk has not had time to reach equilibrium since its formation.
KeywordGalaxy kinematics and dynamics Galaxy disk
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000514471800002
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Document Type期刊论文
Corresponding AuthorLopez-Corredoira, M.
Affiliation1.Inst Astrofis Canarias, Tenerife 38205, Spain
2.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
3.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
4.China West Normal Univ, Dept Astron, Nanchong 637009, Peoples R China
5.Museo Stor Fis, I-00184 Rome, Italy
6.Ctr Studi & Ric Enrico Fermi, I-00184 Rome, Italy
7.CNR, Ist Sistemi Complessi, I-00185 Rome, Italy
8.Univ Roma Sapienza, Ist Nazl Fis Nucl, Unita Roma 1, Dipartimento Fis, I-00185 Rome, Italy
9.Comenius Univ, Fac Math Phys & Informat, Bratislava 84248, Slovakia
10.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
11.Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China
12.Nord Inst Theoret Phys, Roslagstullsbacken 23, S-10691 Stockholm, Sweden
Recommended Citation
GB/T 7714
Lopez-Corredoira, M.,Garzon, F.,Wang, H. -F.,et al. Gaia-DR2 extended kinematical maps II. Dynamics in the Galactic disk explaining radial and vertical velocities[J]. ASTRONOMY & ASTROPHYSICS,2020,634:14.
APA Lopez-Corredoira, M..,Garzon, F..,Wang, H. -F..,Sylos Labini, F..,Nagy, R..,...&Villarroel, B..(2020).Gaia-DR2 extended kinematical maps II. Dynamics in the Galactic disk explaining radial and vertical velocities.ASTRONOMY & ASTROPHYSICS,634,14.
MLA Lopez-Corredoira, M.,et al."Gaia-DR2 extended kinematical maps II. Dynamics in the Galactic disk explaining radial and vertical velocities".ASTRONOMY & ASTROPHYSICS 634(2020):14.
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