Mario Soto VicencioKatherine Vieira2025-03-142025-03-142023Monthly Notices of the Royal Astronomical Society, Volume 524, Issue 1, September 2023, Pages 224–234https://hdl.handle.net/20.500.12740/17427This 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 ∼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 ≃ −8°, and is also reflected in the changes of the velocity ellipsoid in the l, b plane as a function of distance.PDFen-USmethods: data analysisGalaxy: bulgeGalaxy: kinematics and dynamicsGalaxy: stellar contentArtículohttps://doi.org/10.1093/mnras/stad1911