HST proper motions on the far side of the Galactic bar-data

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dc.contributor.authorSoto, Mario
dc.contributor.authorKuijken, Konrad
dc.contributor.authorRich, R. Michael
dc.contributor.authorClarkson, William, I
dc.contributor.authorCastellon, Jose Luis Nilo
dc.contributor.authorFernandez-Trincado, Jose G.
dc.contributor.authorRamos, Rodrigo Contreras
dc.contributor.authorKunder, Andrea
dc.contributor.authorBaravalle, Laura D.
dc.contributor.authorAlonso, M. Victoria
dc.contributor.authorSimion, Iulia T.
dc.contributor.authorJohnson, Christian, I
dc.contributor.authorVieira, Katherine
dc.date.accessioned2025-01-20T20:08:57Z
dc.date.available2025-01-20T20:08:57Z
dc.date.issued2023
dc.description.abstractThis is the third paper in a series that attempts to observe a clear signature of the Galactic bar/bulge using kinematic observations of the bulge stellar populations in low foreground extinction windows. We report on the detection of & SIM;100 000 new proper motions in four fields covering the far side of the Galactic bar/bulge, at negative longitudes. Our proper motions have been obtained using observations from the Advance Camera for Surveys (ACS), on board of the Hubble Space Telescope (HST), with a time-baseline of 8-9 years, which has produced accuracies better than 0.5 mas yr(-1) for a significant fraction of the stellar populations with F814W < 23 mag. Interestingly, as shown in previous works, the Hess diagrams show a strikingly similar proper motion distribution to fields closer to the Galactic center and consistent with an old stellar population. The observed kinematics point to a significant bulge rotation, which seems to predominate even in fields as far as l & SIME; -8 & DEG;, and is also reflected in the changes of the velocity ellipsoid in the l, b plane as a function of distance.
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/stad1911
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stad1911
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91953
dc.identifier.wosidWOS:001023651100017
dc.issue.numero1
dc.language.isoen
dc.pagina.final234
dc.pagina.inicio224
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectmethods: data analysis
dc.subjectGalaxy: bulge
dc.subjectGalaxy: kinematics and dynamics
dc.subjectGalaxy: stellar content
dc.titleHST proper motions on the far side of the Galactic bar-data
dc.typeartículo
dc.volumen524
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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