Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations
We present a comprehensive study of the kinematic properties of the different Galactic disk populations, as defined by the chemical abundance ratios and stellar ages, across a large disk volume (4.5 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc), by using the LAMOST-Gaia red clump sample stars. We determine th...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad06ad |
| _version_ | 1797351272117960704 |
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| author | Weixiang Sun Yang Huang Han Shen Chun Wang Huawei Zhang Zhijia Tian Xiaowei Liu Biwei Jiang |
| author_facet | Weixiang Sun Yang Huang Han Shen Chun Wang Huawei Zhang Zhijia Tian Xiaowei Liu Biwei Jiang |
| author_sort | Weixiang Sun |
| collection | DOAJ |
| description | We present a comprehensive study of the kinematic properties of the different Galactic disk populations, as defined by the chemical abundance ratios and stellar ages, across a large disk volume (4.5 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc), by using the LAMOST-Gaia red clump sample stars. We determine the median velocities for various spatial and population bins, finding large-scale bulk motions; for example, the wave-like behavior in radial velocity, the north–south discrepancy in azimuthal velocity and the warp signal in vertical velocity, and the amplitudes and spatial dependences of these bulk motions show significant variations for different mono-age and mono-abundance populations. The global spatial behaviors of the velocity dispersions clearly show a signal of spiral arms and a signal of the disk perturbation event within 4 Gyr, as well as disk flaring in the outer region (i.e., R ≥ 12 kpc), mostly for young or alpha-poor stellar populations. Our detailed measurements of age/[ α /Fe]-velocity dispersion relations for different disk volumes indicate that young/ α -poor populations are likely to originate from dynamic heating by both giant molecular clouds and spiral arms, while old/ α -enhanced populations require an obvious contribution from other heating mechanisms, such as merger and accretion, or are born in the chaotic mergers of gas-rich systems and/or turbulent interstellar medium. |
| first_indexed | 2024-03-08T12:57:00Z |
| format | Article |
| id | doaj.art-30c72ebea1bd438abcbf6e9eb2f8b59c |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-08T12:57:00Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-30c72ebea1bd438abcbf6e9eb2f8b59c2024-01-19T15:20:05ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01961114110.3847/1538-4357/ad06adMapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar PopulationsWeixiang Sun0https://orcid.org/0009-0005-9277-6758Yang Huang1https://orcid.org/0000-0003-3250-2876Han Shen2https://orcid.org/0000-0001-8962-4132Chun Wang3Huawei Zhang4https://orcid.org/0000-0002-7727-1699Zhijia Tian5https://orcid.org/0000-0003-0220-7112Xiaowei Liu6https://orcid.org/0000-0003-1295-2909Biwei Jiang7https://orcid.org/0000-0003-3168-2617Department of Astronomy, Beijing Normal University , Beijing 100875, People’s Republic of China ; sunweixiang@bnu.edu.cnUniversity of Chinese Academy of Sciences , Beijing 100049, People’s Republic of China ; huangyang@ucas.ac.cn; National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People’s Republic of ChinaSouth-Western Institute for Astronomy Research, Yunnan University , Kunming 650500, People’s Republic of China ; x.liu@ynu.edu.cnTianjin Astrophysics Center, Tianjin Normal University , Tianjin 300387, People’s Republic of ChinaDepartment of Astronomy, Peking University , Beijing 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of ChinaDepartment of Astronomy, Yunnan University , Kunming 650500, People’s Republic of ChinaTianjin Astrophysics Center, Tianjin Normal University , Tianjin 300387, People’s Republic of ChinaDepartment of Astronomy, Beijing Normal University , Beijing 100875, People’s Republic of China ; sunweixiang@bnu.edu.cnWe present a comprehensive study of the kinematic properties of the different Galactic disk populations, as defined by the chemical abundance ratios and stellar ages, across a large disk volume (4.5 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc), by using the LAMOST-Gaia red clump sample stars. We determine the median velocities for various spatial and population bins, finding large-scale bulk motions; for example, the wave-like behavior in radial velocity, the north–south discrepancy in azimuthal velocity and the warp signal in vertical velocity, and the amplitudes and spatial dependences of these bulk motions show significant variations for different mono-age and mono-abundance populations. The global spatial behaviors of the velocity dispersions clearly show a signal of spiral arms and a signal of the disk perturbation event within 4 Gyr, as well as disk flaring in the outer region (i.e., R ≥ 12 kpc), mostly for young or alpha-poor stellar populations. Our detailed measurements of age/[ α /Fe]-velocity dispersion relations for different disk volumes indicate that young/ α -poor populations are likely to originate from dynamic heating by both giant molecular clouds and spiral arms, while old/ α -enhanced populations require an obvious contribution from other heating mechanisms, such as merger and accretion, or are born in the chaotic mergers of gas-rich systems and/or turbulent interstellar medium.https://doi.org/10.3847/1538-4357/ad06adStellar abundancesStellar kinematicsStellar populationsMilky Way formationMilky Way evolutionMilky Way disk |
| spellingShingle | Weixiang Sun Yang Huang Han Shen Chun Wang Huawei Zhang Zhijia Tian Xiaowei Liu Biwei Jiang Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations The Astrophysical Journal Stellar abundances Stellar kinematics Stellar populations Milky Way formation Milky Way evolution Milky Way disk |
| title | Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations |
| title_full | Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations |
| title_fullStr | Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations |
| title_full_unstemmed | Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations |
| title_short | Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VIII. Mapping the Kinematics of the Galactic Disk Using Mono-age and Mono-abundance Stellar Populations |
| title_sort | mapping the galactic disk with the lamost and gaia red clump sample viii mapping the kinematics of the galactic disk using mono age and mono abundance stellar populations |
| topic | Stellar abundances Stellar kinematics Stellar populations Milky Way formation Milky Way evolution Milky Way disk |
| url | https://doi.org/10.3847/1538-4357/ad06ad |
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