The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud
Utilizing astrometric parameters sourced from Gaia Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (HiVels) with a total velocity in the Galactocentric rest frame greater than 70% of their local escape velocity under the Gala Milk...
| 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 Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/ad18c4 |
| _version_ | 1797346586592804864 |
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| author | Jiwei Liao Cuihua Du Mingji Deng Dashuang Ye Hefan Li Yang Huang Jianrong Shi Jun Ma |
| author_facet | Jiwei Liao Cuihua Du Mingji Deng Dashuang Ye Hefan Li Yang Huang Jianrong Shi Jun Ma |
| author_sort | Jiwei Liao |
| collection | DOAJ |
| description | Utilizing astrometric parameters sourced from Gaia Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (HiVels) with a total velocity in the Galactocentric rest frame greater than 70% of their local escape velocity under the Gala MilkyWayPotential . Our analysis reveals that the majority of these HiVels are metal-poor late-type giants, and we show nine HiVels that are unbound candidates to the Galaxy with escape probabilities of 50%. To investigate the origins of these HiVels, we classify them into four categories and consider the impact of the Large Magellanic Cloud (LMC) potential on their backward-integration trajectories. Specifically, we find that one of the HiVels can track back to the Galactic center, and three HiVels may originate from the Sagittarius dwarf spheroidal galaxy (Sgr dSph). Furthermore, some HiVels appear to be ejected from the Galactic disk, while others formed within the Milky Way or have an extragalactic origin. Given that the LMC has a significant impact on the orbits of Sgr dSph, we examine the reported HiVels that originate from the Sgr dSph, with a few of them passing within the half-light radius of the Sgr dSph. |
| first_indexed | 2024-03-08T11:35:36Z |
| format | Article |
| id | doaj.art-b52e1b01b7b646bdb1e4ccf11482af32 |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-08T11:35:36Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-b52e1b01b7b646bdb1e4ccf11482af322024-01-25T12:58:34ZengIOP PublishingThe Astronomical Journal1538-38812024-01-0116727610.3847/1538-3881/ad18c4The Origin of High-velocity Stars Considering the Impact of the Large Magellanic CloudJiwei Liao0https://orcid.org/0000-0001-6762-5599Cuihua Du1https://orcid.org/0000-0002-3954-617XMingji Deng2Dashuang Ye3Hefan Li4https://orcid.org/0000-0002-9497-8127Yang Huang5https://orcid.org/0000-0003-3250-2876Jianrong Shi6https://orcid.org/0000-0002-0349-7839Jun Ma7https://orcid.org/0000-0001-6329-6644School of Astronomy and Space Sciences, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; ducuihua@ucas.ac.cnSchool of Astronomy and Space Sciences, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; ducuihua@ucas.ac.cnSchool of Astronomy and Space Sciences, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; ducuihua@ucas.ac.cnSchool of Astronomy and Space Sciences, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; ducuihua@ucas.ac.cnKey Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of ChinaSchool of Astronomy and Space Sciences, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; ducuihua@ucas.ac.cn; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of ChinaSchool of Astronomy and Space Sciences, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; ducuihua@ucas.ac.cn; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of ChinaSchool of Astronomy and Space Sciences, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China ; ducuihua@ucas.ac.cn; Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of ChinaUtilizing astrometric parameters sourced from Gaia Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (HiVels) with a total velocity in the Galactocentric rest frame greater than 70% of their local escape velocity under the Gala MilkyWayPotential . Our analysis reveals that the majority of these HiVels are metal-poor late-type giants, and we show nine HiVels that are unbound candidates to the Galaxy with escape probabilities of 50%. To investigate the origins of these HiVels, we classify them into four categories and consider the impact of the Large Magellanic Cloud (LMC) potential on their backward-integration trajectories. Specifically, we find that one of the HiVels can track back to the Galactic center, and three HiVels may originate from the Sagittarius dwarf spheroidal galaxy (Sgr dSph). Furthermore, some HiVels appear to be ejected from the Galactic disk, while others formed within the Milky Way or have an extragalactic origin. Given that the LMC has a significant impact on the orbits of Sgr dSph, we examine the reported HiVels that originate from the Sgr dSph, with a few of them passing within the half-light radius of the Sgr dSph.https://doi.org/10.3847/1538-3881/ad18c4High-velocity starsStellar kinematicsStellar dynamicsSagittarius dwarf spheroidal galaxyLarge Magellanic Cloud |
| spellingShingle | Jiwei Liao Cuihua Du Mingji Deng Dashuang Ye Hefan Li Yang Huang Jianrong Shi Jun Ma The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud The Astronomical Journal High-velocity stars Stellar kinematics Stellar dynamics Sagittarius dwarf spheroidal galaxy Large Magellanic Cloud |
| title | The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud |
| title_full | The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud |
| title_fullStr | The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud |
| title_full_unstemmed | The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud |
| title_short | The Origin of High-velocity Stars Considering the Impact of the Large Magellanic Cloud |
| title_sort | origin of high velocity stars considering the impact of the large magellanic cloud |
| topic | High-velocity stars Stellar kinematics Stellar dynamics Sagittarius dwarf spheroidal galaxy Large Magellanic Cloud |
| url | https://doi.org/10.3847/1538-3881/ad18c4 |
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