New candidate hypervelocity red clump stars in the inner Galactic bulge

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dc.contributor.authorLuna, A.
dc.contributor.authorMarchetti, T.
dc.contributor.authorRejkuba, M.
dc.contributor.authorLeigh, N. W. C.
dc.contributor.authorAlonso-Garcia, J.
dc.contributor.authorNavarro, A. Valenzuela
dc.contributor.authorMinniti, D.
dc.contributor.authorSmith, L. C.
dc.date.accessioned2025-01-20T17:07:51Z
dc.date.available2025-01-20T17:07:51Z
dc.date.issued2024
dc.description.abstractWe search for high-velocity stars in the inner region of the Galactic bulge using a selected sample of red clump stars. Some of those stars might be considered hypervelocity stars (HVSs). Even though the HVSs ejection relies on an interaction with the supermassive black hole (SMBH) at the centre of the Galaxy, there are no confirmed detections of HVSs in the inner region of our Galaxy. With the detection of HVSs, ejection mechanism models can be constrained by exploring the stellar dynamics in the Galactic centre through a recent stellar interaction with the SMBH. Based on a previously developed methodology by our group, we searched with a sample of preliminary data from version 2 of the Vista Variables in the Via Lactea (VVV) Infrared Astrometric Catalogue (VIRAC2) and Gaia DR3 data, including accurate optical and near-infrared proper motions. This search resulted in a sample of 46 stars with transverse velocities larger than the local escape velocity within the Galactic bulge, of which four are prime candidate HVSs with high-proper motions consistent with being ejections from the Galactic centre. Adding to that, we studied a sample of reddened stars without a Gaia DR3 counterpart and found 481 stars with transverse velocities larger than the local escape velocity, from which 65 stars have proper motions pointing out of the Galactic centre and are candidate HVSs. In total, we found 69 candidate HVSs pointing away from the Galactic centre with transverse velocities larger than the local escape velocity.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stae128
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stae128
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90901
dc.identifier.wosidWOS:001164781800006
dc.issue.numero4
dc.language.isoen
dc.pagina.final5510
dc.pagina.inicio5495
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectsurveys
dc.subjectproper motions
dc.subjectstars: peculiar (except chemically peculiar)
dc.subjectGalaxy: bulge
dc.subjectGalaxy: kinematics and dynamics
dc.titleNew candidate hypervelocity red clump stars in the inner Galactic bulge
dc.typeartículo
dc.volumen528
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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