%0 Generic %1 li2022candidate %A Li, Hefan %A Du, Cuihua %A Ma, Jun %A Shi, Jianrong %A Newberg, Heidi Jo %A Piao, Yunsong %D 2022 %K astronomy gaia galaxy hills_mechanism hvs sagittarius %T 60 candidate high-velocity stars originating from the Sagittarius dwarf spheroidal galaxy in Gaia EDR3 %U https://arxiv.org/abs/2206.13002 %X Using proper motions from Gaia Early Data Release 3 (Gaia EDR 3) and radial velocities from several surveys, we identify 60 candidate high-velocity stars with total velocity greater than 75\% escape velocity that probably origin from 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 non-negligible effect on only a few stars. The closest approach of these stars to the Sgr occurs when the Sgr passed its pericenter (∼ 38.2 Myr ago), which suggest they were tidally stripped from the Sgr. The positions of these stars in the HR diagram and the chemical properties of 19 of them with available Fe/H are similar with 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 Hills mechanism.

@misc{li2022candidate, abstract = {Using proper motions from Gaia Early Data Release 3 (Gaia EDR 3) and radial velocities from several surveys, we identify 60 candidate high-velocity stars with total velocity greater than 75\% escape velocity that probably origin from 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 non-negligible effect on only a few stars. The closest approach of these stars to the Sgr occurs when the Sgr passed its pericenter (∼ 38.2 Myr ago), which suggest they were tidally stripped from the Sgr. The positions of these stars in the HR diagram and the chemical properties of 19 of them with available [Fe/H] are similar with 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 Hills mechanism. }, added-at = {2024-02-27T14:02:06.000+0100}, archiveprefix = {arXiv}, author = {Li, Hefan and Du, Cuihua and Ma, Jun and Shi, Jianrong and Newberg, Heidi Jo and Piao, Yunsong}, biburl = {https://www.bibsonomy.org/bibtex/267fda8f7587b8375abedb5a6999dcd94/tabularii}, description = {[2206.13002] 60 candidate high-velocity stars originating from the Sagittarius dwarf spheroidal galaxy in Gaia EDR3}, eprint = {2206.13002}, interhash = {5ae5bc534e89edf67535b12e9462b510}, intrahash = {67fda8f7587b8375abedb5a6999dcd94}, keywords = {astronomy gaia galaxy hills_mechanism hvs sagittarius}, primaryclass = {astro-ph.GA}, timestamp = {2024-02-27T14:03:37.000+0100}, title = {60 candidate high-velocity stars originating from the Sagittarius dwarf spheroidal galaxy in Gaia EDR3}, url = {https://arxiv.org/abs/2206.13002}, year = 2022 }