Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars
A detailed measurement is made of the metallicity distributions, kinematics, and dynamics of the thin and thick disks across a large disk volume (5.0 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc) by using the LAMOST–APOGEE red clump stars. The metallicity distribution results show that the radial metallicity...
| Main Authors: | , , , |
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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 Supplement Series |
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| Online Access: | https://doi.org/10.3847/1538-4365/ad3043 |
| _version_ | 1797193741572767744 |
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| author | Weixiang Sun Han Shen Biwei Jiang Xiaowei Liu |
| author_facet | Weixiang Sun Han Shen Biwei Jiang Xiaowei Liu |
| author_sort | Weixiang Sun |
| collection | DOAJ |
| description | A detailed measurement is made of the metallicity distributions, kinematics, and dynamics of the thin and thick disks across a large disk volume (5.0 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc) by using the LAMOST–APOGEE red clump stars. The metallicity distribution results show that the radial metallicity gradient Δ[Fe/H]/Δ R of the thin disk weakens with ∣ Z ∣ from −0.06 dex kpc ^−1 at around ∣ Z ∣ < 0.25 kpc to −0.02 dex kpc ^−1 at around ∣ Z ∣ > 2.75 kpc, while the thick disk displays a global weak positive Δ[Fe/H]/Δ R that is generally weaker than 0.01 dex kpc ^−1 . The vertical metallicity gradient Δ[Fe/H]/Δ∣ Z ∣ steadily weakened from −0.36 dex kpc ^−1 at R ∼ 5.5 kpc to −0.05 dex kpc ^−1 at around R > 11.5 kpc for the thin disk, while the thick disk presents an almost constant value (nearly −0.06∼−0.08 dex kpc ^−1 ) for all the R bins. These results indicate the contribution of the radial migration to the disk evolution, and the obvious north–south asymmetry in [Fe/H] may be linked to disk warp and/or disk perturbation events. The oscillations in the corrected Δ[Fe/H]/Δ∣ Z ∣ with R likely arise from the resonances with the Galactic bar. Our detailed measurements of Δ V _ϕ /Δ[Fe/H] indicate an inside-out and upside-down star formation scenario for the thick disk. The results of eccentricity distributions and [ α /Fe]–velocity dispersion relations are likely to suggest that thick-disk stars require an obvious contribution from other heating mechanisms, such as mergers and accretion, or are born in the chaotic mergers of gas-rich systems and/or the turbulent interstellar medium. |
| first_indexed | 2024-04-24T05:45:12Z |
| format | Article |
| id | doaj.art-cd76b99f667349269fc52b8b85c3dbef |
| institution | Directory Open Access Journal |
| issn | 0067-0049 |
| language | English |
| last_indexed | 2024-04-24T05:45:12Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Supplement Series |
| spelling | doaj.art-cd76b99f667349269fc52b8b85c3dbef2024-04-23T17:07:21ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492024-01-012721810.3847/1538-4365/ad3043Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump StarsWeixiang Sun0https://orcid.org/0009-0005-9277-6758Han Shen1https://orcid.org/0000-0001-8962-4132Biwei Jiang2https://orcid.org/0000-0003-3168-2617Xiaowei Liu3https://orcid.org/0000-0003-1295-2909Department of Astronomy, Beijing Normal University , Beijing 100875, People’s Republic of China ; sunweixiang@bnu.edu.cn, bjiang@bnu.edu.cnSouth-Western Institute for Astronomy Research, Yunnan University , Kunming 650500, People’s Republic of China ; x.liu@ynu.edu.cnDepartment of Astronomy, Beijing Normal University , Beijing 100875, People’s Republic of China ; sunweixiang@bnu.edu.cn, bjiang@bnu.edu.cnSouth-Western Institute for Astronomy Research, Yunnan University , Kunming 650500, People’s Republic of China ; x.liu@ynu.edu.cnA detailed measurement is made of the metallicity distributions, kinematics, and dynamics of the thin and thick disks across a large disk volume (5.0 ≤ R ≤ 15.0 kpc and ∣ Z ∣ ≤ 3.0 kpc) by using the LAMOST–APOGEE red clump stars. The metallicity distribution results show that the radial metallicity gradient Δ[Fe/H]/Δ R of the thin disk weakens with ∣ Z ∣ from −0.06 dex kpc ^−1 at around ∣ Z ∣ < 0.25 kpc to −0.02 dex kpc ^−1 at around ∣ Z ∣ > 2.75 kpc, while the thick disk displays a global weak positive Δ[Fe/H]/Δ R that is generally weaker than 0.01 dex kpc ^−1 . The vertical metallicity gradient Δ[Fe/H]/Δ∣ Z ∣ steadily weakened from −0.36 dex kpc ^−1 at R ∼ 5.5 kpc to −0.05 dex kpc ^−1 at around R > 11.5 kpc for the thin disk, while the thick disk presents an almost constant value (nearly −0.06∼−0.08 dex kpc ^−1 ) for all the R bins. These results indicate the contribution of the radial migration to the disk evolution, and the obvious north–south asymmetry in [Fe/H] may be linked to disk warp and/or disk perturbation events. The oscillations in the corrected Δ[Fe/H]/Δ∣ Z ∣ with R likely arise from the resonances with the Galactic bar. Our detailed measurements of Δ V _ϕ /Δ[Fe/H] indicate an inside-out and upside-down star formation scenario for the thick disk. The results of eccentricity distributions and [ α /Fe]–velocity dispersion relations are likely to suggest that thick-disk stars require an obvious contribution from other heating mechanisms, such as mergers and accretion, or are born in the chaotic mergers of gas-rich systems and/or the turbulent interstellar medium.https://doi.org/10.3847/1538-4365/ad3043Stellar abundancesStellar kinematicsMilky Way dynamicsMilky Way diskMilky Way formationMilky Way evolution |
| spellingShingle | Weixiang Sun Han Shen Biwei Jiang Xiaowei Liu Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars The Astrophysical Journal Supplement Series Stellar abundances Stellar kinematics Milky Way dynamics Milky Way disk Milky Way formation Milky Way evolution |
| title | Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars |
| title_full | Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars |
| title_fullStr | Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars |
| title_full_unstemmed | Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars |
| title_short | Mapping the Chemodynamics of the Galactic Disk Using the LAMOST and APOGEE Red Clump Stars |
| title_sort | mapping the chemodynamics of the galactic disk using the lamost and apogee red clump stars |
| topic | Stellar abundances Stellar kinematics Milky Way dynamics Milky Way disk Milky Way formation Milky Way evolution |
| url | https://doi.org/10.3847/1538-4365/ad3043 |
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