Chemodynamical Nature of the Anticenter Stream and Monoceros Ring
In the epoch of deep photometric surveys, a large number of substructures—e.g., overdensities and streams—have been identified. With the help of astrometry and spectroscopy, the community has revealed a complex picture of our Milky Way (MW) after investigating their origins. The off-plane substructu...
| 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 |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad0fd7 |
| _version_ | 1797353810951143424 |
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| author | Yi Qiao Baitian Tang Jianhui Lian Jing Li Cheng Xu |
| author_facet | Yi Qiao Baitian Tang Jianhui Lian Jing Li Cheng Xu |
| author_sort | Yi Qiao |
| collection | DOAJ |
| description | In the epoch of deep photometric surveys, a large number of substructures—e.g., overdensities and streams—have been identified. With the help of astrometry and spectroscopy, the community has revealed a complex picture of our Milky Way (MW) after investigating their origins. The off-plane substructures the Anticenter Stream (ACS) and Monoceros Ring (MNC), once considered as dissolving dwarf galaxies, were later found to share similar kinematics and metallicity with the Galactic outer thin disk. In this work, we aim to chemically tag ACS and MNC with high-accuracy abundances from the APOGEE survey. By extrapolating chemical abundance trends in the outer thin-disk region (10 < R _GC < 18 kpc, 0 < ∣ Z _GC ∣ < 3 kpc), we found that ACS and MNC stars show consistent chemical abundances as the extrapolating values for 12 elements, including C, N, O, Mg, Al, Si, K, Ca, Cr, Mn, Co, and Ni. The similar chemical patterns indicate that ACS and MNC have a similar star formation history as the MW outer thin disk, while we also excluded their dwarf galaxy association, as they are distinctive in multiple chemical spaces. The ages of ACS and MNC stars are consistent with the time of the first Sagittarius dSph passage, indicating their possible connection. |
| first_indexed | 2024-03-08T13:36:21Z |
| format | Article |
| id | doaj.art-7193c597d2a841eabc337d723dc18407 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-08T13:36:21Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-7193c597d2a841eabc337d723dc184072024-01-16T16:12:24ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0196116510.3847/1538-4357/ad0fd7Chemodynamical Nature of the Anticenter Stream and Monoceros RingYi Qiao0https://orcid.org/0009-0004-8795-2473Baitian Tang1https://orcid.org/0000-0002-0066-0346Jianhui Lian2https://orcid.org/0000-0001-5258-1466Jing Li3https://orcid.org/0000-0002-4953-1545Cheng Xu4https://orcid.org/0009-0007-3698-4995School of Physics and Astronomy, Sun Yat-sen University , Daxue Road, Zhuhai, 519082, People’s Republic of China ; tangbt@sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , Zhuhai, 519082, People’s Republic of ChinaSchool of Physics and Astronomy, Sun Yat-sen University , Daxue Road, Zhuhai, 519082, People’s Republic of China ; tangbt@sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , Zhuhai, 519082, People’s Republic of ChinaSouth-Western Institute For Astronomy Research, Astronomy Building, Yunnan University , Chenggong District, Kunming, 650500, People’s Republic of ChinaSchool of Physics and Astronomy, China West Normal University , 1 ShiDa Road, Nanchong, 637002, People’s Republic of ChinaSchool of Physics and Astronomy, Sun Yat-sen University , Daxue Road, Zhuhai, 519082, People’s Republic of China ; tangbt@sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , Zhuhai, 519082, People’s Republic of ChinaIn the epoch of deep photometric surveys, a large number of substructures—e.g., overdensities and streams—have been identified. With the help of astrometry and spectroscopy, the community has revealed a complex picture of our Milky Way (MW) after investigating their origins. The off-plane substructures the Anticenter Stream (ACS) and Monoceros Ring (MNC), once considered as dissolving dwarf galaxies, were later found to share similar kinematics and metallicity with the Galactic outer thin disk. In this work, we aim to chemically tag ACS and MNC with high-accuracy abundances from the APOGEE survey. By extrapolating chemical abundance trends in the outer thin-disk region (10 < R _GC < 18 kpc, 0 < ∣ Z _GC ∣ < 3 kpc), we found that ACS and MNC stars show consistent chemical abundances as the extrapolating values for 12 elements, including C, N, O, Mg, Al, Si, K, Ca, Cr, Mn, Co, and Ni. The similar chemical patterns indicate that ACS and MNC have a similar star formation history as the MW outer thin disk, while we also excluded their dwarf galaxy association, as they are distinctive in multiple chemical spaces. The ages of ACS and MNC stars are consistent with the time of the first Sagittarius dSph passage, indicating their possible connection.https://doi.org/10.3847/1538-4357/ad0fd7Chemical abundancesGalactic anticenterMilky Way diskStellar dynamicsStellar kinematics |
| spellingShingle | Yi Qiao Baitian Tang Jianhui Lian Jing Li Cheng Xu Chemodynamical Nature of the Anticenter Stream and Monoceros Ring The Astrophysical Journal Chemical abundances Galactic anticenter Milky Way disk Stellar dynamics Stellar kinematics |
| title | Chemodynamical Nature of the Anticenter Stream and Monoceros Ring |
| title_full | Chemodynamical Nature of the Anticenter Stream and Monoceros Ring |
| title_fullStr | Chemodynamical Nature of the Anticenter Stream and Monoceros Ring |
| title_full_unstemmed | Chemodynamical Nature of the Anticenter Stream and Monoceros Ring |
| title_short | Chemodynamical Nature of the Anticenter Stream and Monoceros Ring |
| title_sort | chemodynamical nature of the anticenter stream and monoceros ring |
| topic | Chemical abundances Galactic anticenter Milky Way disk Stellar dynamics Stellar kinematics |
| url | https://doi.org/10.3847/1538-4357/ad0fd7 |
| work_keys_str_mv | AT yiqiao chemodynamicalnatureoftheanticenterstreamandmonocerosring AT baitiantang chemodynamicalnatureoftheanticenterstreamandmonocerosring AT jianhuilian chemodynamicalnatureoftheanticenterstreamandmonocerosring AT jingli chemodynamicalnatureoftheanticenterstreamandmonocerosring AT chengxu chemodynamicalnatureoftheanticenterstreamandmonocerosring |