A proper motion catalogue for the Milky Way's nuclear stellar disc

Autor: B. Shahzamanian, R. Schödel, F. Nogueras-Lara, A. Martínez-Arranz, M. C. Sormani, A. T. Gallego-Calvente, E. Gallego-Cano, A. Alburai
Přispěvatelé: Ministerio de Ciencia e Innovación (España), European Commission, European Research Council, German Research Foundation
Rok vydání: 2021
Předmět:
Zdroj: A&A
Digital.CSIC. Repositorio Institucional del CSIC
instname
DOI: 10.48550/arxiv.2108.11847
Popis: We present the results of a large-scale proper motion study of the central ∼36′ × 16′ of the Milky Way, based on our high angular resolution GALACTICNUCLEUS survey (epoch 2015) combined with the HST Paschen-α survey (epoch 2008). Our catalogue contains roughly 80 000 stars, an unprecedented kinematic dataset for this region. We describe the data analysis and the preparation of the proper motion catalogue. We verify the catalogue by comparing our results with measurements from previous work and data. We provide a preliminary analysis of the kinematics of the studied region. Foreground stars in the Galactic disc can be easily identified via their low reddening. Consistent with previous work and with our expectations, we find that stars in the nuclear stellar disc have a smaller velocity dispersion than inner bulge stars, in particular in the direction perpendicular to the Galactic plane. The rotation of the nuclear stellar disc can be clearly seen in the proper motions parallel to the Galactic plane. Stars on the near side of the nuclear stellar disc are less reddened than stars on its far side. Proper motions enable us to detect co-moving groups of stars that may be associated with young clusters dissolving in the galactic centre that are difficult to detect by other means. We demonstrate a technique based on a density clustering algorithm that can be used to find such groups of stars. © ESO 2022.
B.Sh., R.S., and A.T.G.C. acknowledge financial support from the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ocho” award for the Instituto de Astrofísica de Andalucía (SEV-2017-0709). B.Sh., A.T.G.C., A.A., and R.S. acknowledge financial support from national project PGC2018-095049-B-C21 (MCIU/AEI/FEDER, UE). F.N.L. and M.C.S. gratefully acknowledge support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Project-ID 138713538 SFB 881 (The Milky Way System, subproject B8). M.C.S. furthermore acknowledges support from the ERC via the ERC Synergy Grant “ECOGAL” (grant 855130). F.N.L. acknowledges the sponsorship provided by the Federal Ministry for Education and Research of Germany through the Alexander von Humboldt Foundation. This work is based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programmes IDs 195.B-0283. We thank the staff of ESO for their great efforts and helpfulness. This research is based on observations made with the NASA/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programs 11671, 12318, 12667, and 14613.
Databáze: OpenAIRE
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