60 Candidate High-velocity Stars Originating from the Sagittarius Dwarf Spheroidal Galaxy in Gaia EDR3

Li, Hefan; Du, Cuihua; Ma, Jun; Shi, Jianrong; Newberg, Heidi Jo; Piao, Yunsong

doi:10.3847/2041-8213/ac786d

60 Candidate High-velocity Stars Originating from the Sagittarius Dwarf Spheroidal Galaxy in Gaia EDR3

Journal Article · Thu Jun 30 00:00:00 EDT 2022 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.3847/2041-8213/ac786d· OSTI ID:1983327

^[1]; ^[1]; ^[2]; ^[2]; ^[3]; Piao, Yunsong ^[4]

University of Chinese Academy of Sciences, Beijing (China)
University of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
Rensselaer Polytechnic Inst., Troy, NY (United States)
Chinese Academy of Sciences (CAS), Beijing (China)

Using proper motions from Gaia Early Data Release 3 (Gaia EDR3) and radial velocities from several surveys, we identify 60 candidate high-velocity stars with a total velocity greater than 75% of the escape velocity that probably originated from the Sagittarius dwarf spheroidal galaxy (Sgr) by orbital analysis. Sgr’s gravity has little effect on the results and the Large Magellanic Cloud’s gravity has a nonnegligible effect on only a few stars. The closest approach of these stars to the Sgr occurred when the Sgr passed its pericenter (~38.2 Myr ago), which suggests they were tidally stripped from the Sgr. The positions of these stars in the Hertzsprung–Russell diagram and the chemical properties of 19 of them with available [Fe/H] are similar to the Sgr stream member stars. This is consistent with the assumption of their accretion origin. Two of the 60 are hypervelocity stars, which may also be produced by the Hills mechanism.

View Accepted Manuscript (DOE)

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: Fundamental Research Funds for the Central Universities; National Key R&D Program of China; National Natural Foundation of China; USDOE Office of Science (SC)

OSTI ID:: 1983327

Journal Information:: The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Journal Issue: 1 Vol. 933; ISSN 2041-8205

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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