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

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dc.contributor.authorSoto, M
dc.contributor.authorKuijken, K
dc.contributor.authorRich, RM
dc.contributor.authorClarkson, WI
dc.contributor.author[et al.]
dc.date.accessioned2024-05-24T14:19:01Z
dc.date.available2024-05-24T14:19:01Z
dc.date.issued2023-07-04
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.identifier.citationMario Soto, Konrad Kuijken, R Michael Rich, William I Clarkson, José Luis Nilo Castellón, José G Fernández-Trincado, Rodrigo Contreras Ramos, Andrea Kunder, Laura D Baravalle, M Victoria Alonso, Iulia T Simion, Christian I Johnson, Katherine Vieira, HST proper motions on the far side of the Galactic bar—data, Monthly Notices of the Royal Astronomical Society, Volume 524, Issue 1, September 2023, Pages 224–234, https://doi.org/10.1093/mnras/stad1911
dc.identifier.issn0035-8711
dc.identifier.other1365-2966
dc.identifier.urihttps://conocimientoabierto.online/handle/123456789/43
dc.language.isoen
dc.publisherMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
dc.titleHST proper motions on the far side of the Galactic bar-data

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