Proper motions for HST observations in three off-axis bulge fields

M. Soto; H. Zeballos; K. Kuijken; R. M. Rich; A. Kunder; T. Astraatmadja

doi:10.1051/0004-6361/201117339

Proper motions for HST observations in three off-axis bulge fields

M. Soto, H. Zeballos, K. Kuijken, R. M. Rich, A. Kunder, T. Astraatmadja

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

11 Citas (Scopus)

Resumen

Aims. This is the second in a series of papers that attempt to unveil the kinematic structure of the Galactic bulge through studying radial velocities and proper motions. We report here ~15 000 new proper motions for three low foreground-extinction off-axis fields of the Galactic bulge. Methods. Proper motions were derived from a combination of Hubble Space TelescopeWide Field Planetary Camera 2 (WFPC2) and Advanced Camera for Surveys (ACS) images taken 8 and 9 years apart, and they reach accuracies better than 0.9 mas yr^-1 for more than ~10 000 objects with magnitudes F814W ≤ 24. Results. The proper motion distributions in these fields are similar to those of Galactic minor axis bulge fields.We observe the rotation of main sequence stars below the turn-off within the Galactic bulge, as in the minor axis fields. Conclusions. Our stellar proper motions measurements show a significant bulge rotation for fields as far from the Galactic plane as b ≈ -8°.

Idioma original	Inglés
Número de artículo	A41
Publicación	Astronomy and Astrophysics
Volumen	562
DOI	https://doi.org/10.1051/0004-6361/201117339
Estado	Publicada - feb. 2014
Publicado de forma externa	Sí

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title = "Proper motions for HST observations in three off-axis bulge fields",

abstract = "Aims. This is the second in a series of papers that attempt to unveil the kinematic structure of the Galactic bulge through studying radial velocities and proper motions. We report here ~15 000 new proper motions for three low foreground-extinction off-axis fields of the Galactic bulge. Methods. Proper motions were derived from a combination of Hubble Space TelescopeWide Field Planetary Camera 2 (WFPC2) and Advanced Camera for Surveys (ACS) images taken 8 and 9 years apart, and they reach accuracies better than 0.9 mas yr-1 for more than ~10 000 objects with magnitudes F814W ≤ 24. Results. The proper motion distributions in these fields are similar to those of Galactic minor axis bulge fields.We observe the rotation of main sequence stars below the turn-off within the Galactic bulge, as in the minor axis fields. Conclusions. Our stellar proper motions measurements show a significant bulge rotation for fields as far from the Galactic plane as b ≈ -8°.",

keywords = "Galaxy: bulge, Galaxy: kinematics and dynamics, Galaxy: stellar content, methods: data analysis",

author = "M. Soto and H. Zeballos and K. Kuijken and Rich, {R. M.} and A. Kunder and T. Astraatmadja",

note = "Funding Information: Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Institute. STScI is operated by the association of Universities for Research in Astronomy, Inc. under the NASA contract NAS 5-26555. Funding Information: M.S. acknowledges support by Fondecyt project 3110188 and Comit{\'e} Mixto ESO- Chile. R.M.R. acknowledges funding from GO-9816 and from AST-0709479 from the National Science Foundation. This material is based upon work supported in part by the National Science Foundation under Grant No. 1066293 and by the hospitality of the Aspen Center for Physics.",

year = "2014",

month = feb,

doi = "10.1051/0004-6361/201117339",

language = "English",

volume = "562",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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T1 - Proper motions for HST observations in three off-axis bulge fields

AU - Soto, M.

AU - Zeballos, H.

AU - Kuijken, K.

AU - Rich, R. M.

AU - Kunder, A.

AU - Astraatmadja, T.

N1 - Funding Information: Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Institute. STScI is operated by the association of Universities for Research in Astronomy, Inc. under the NASA contract NAS 5-26555. Funding Information: M.S. acknowledges support by Fondecyt project 3110188 and Comité Mixto ESO- Chile. R.M.R. acknowledges funding from GO-9816 and from AST-0709479 from the National Science Foundation. This material is based upon work supported in part by the National Science Foundation under Grant No. 1066293 and by the hospitality of the Aspen Center for Physics.

PY - 2014/2

Y1 - 2014/2

N2 - Aims. This is the second in a series of papers that attempt to unveil the kinematic structure of the Galactic bulge through studying radial velocities and proper motions. We report here ~15 000 new proper motions for three low foreground-extinction off-axis fields of the Galactic bulge. Methods. Proper motions were derived from a combination of Hubble Space TelescopeWide Field Planetary Camera 2 (WFPC2) and Advanced Camera for Surveys (ACS) images taken 8 and 9 years apart, and they reach accuracies better than 0.9 mas yr-1 for more than ~10 000 objects with magnitudes F814W ≤ 24. Results. The proper motion distributions in these fields are similar to those of Galactic minor axis bulge fields.We observe the rotation of main sequence stars below the turn-off within the Galactic bulge, as in the minor axis fields. Conclusions. Our stellar proper motions measurements show a significant bulge rotation for fields as far from the Galactic plane as b ≈ -8°.

AB - Aims. This is the second in a series of papers that attempt to unveil the kinematic structure of the Galactic bulge through studying radial velocities and proper motions. We report here ~15 000 new proper motions for three low foreground-extinction off-axis fields of the Galactic bulge. Methods. Proper motions were derived from a combination of Hubble Space TelescopeWide Field Planetary Camera 2 (WFPC2) and Advanced Camera for Surveys (ACS) images taken 8 and 9 years apart, and they reach accuracies better than 0.9 mas yr-1 for more than ~10 000 objects with magnitudes F814W ≤ 24. Results. The proper motion distributions in these fields are similar to those of Galactic minor axis bulge fields.We observe the rotation of main sequence stars below the turn-off within the Galactic bulge, as in the minor axis fields. Conclusions. Our stellar proper motions measurements show a significant bulge rotation for fields as far from the Galactic plane as b ≈ -8°.

KW - Galaxy: bulge

KW - Galaxy: kinematics and dynamics

KW - Galaxy: stellar content

KW - methods: data analysis

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Proper motions for HST observations in three off-axis bulge fields

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