HST proper motions on the far side of the Galactic bar-data
| dc.contributor.author | Soto, Mario, Kuijken, Konrad, Rich, R. Michael, Clarkson, William, I, Castellon, Jose Luis Nilo, Fernandez-Trincado, Jose G., Ramos, Rodrigo Contreras, Kunder, Andrea, Baravalle, Laura D., Alonso, M. Victoria, Simion, Iulia T., Johnson, Christian, I, Vieira, Katherine | |
| dc.date.accessioned | 2024-11-27T21:50:37Z | |
| dc.date.available | 2024-11-27T21:50:37Z | |
| dc.date.issued | 2023/07/04 | |
| dc.description.abstract | This 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.doi | http://dx.doi.org/10.1093/mnras/stad1911 | |
| dc.identifier.issn | 0035-8711 | |
| dc.identifier.uri | https://publicacionesabiertas.userena.cl/handle/123456789/113 | |
| dc.language | English | |
| dc.publisher | OXFORD UNIV PRESS | |
| dc.subject | MILKY-WAY BULGE, STELLAR POPULATIONS, VERTEX DEVIATION, RED CLUMP, KINEMATICS, VVV, AGE, ABUNDANCES, BAR/BULGE, FIELDS | |
| dc.title | HST proper motions on the far side of the Galactic bar-data | |
| dc.type | Article |