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Paper: Proper Motion Study of the Galactic Centre
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 365
Authors: Shahzamanian, B.; Schödel, R.
Abstract: Stellar proper motion studies in the centre of the Milky Way have been typically limited to the Quintuplet and Arches, and to the central parsec. Here, we present the primary results of a large-scale proper motion study of the central ∼36' ×16' of the Galaxy based on our GALACTICNUCLEUS survey (epoch 2015) combined with the HST Paschen-α survey (epoch 2008). This region of our Galaxy is not covered sufficiently by the existing astronomical surveys such as Gaia due to the high extinction (Av30 mag). Proper motions can help us to disentangle different structures (Galactic bulge, nuclear stellar disk, nuclear stellar cluster) of the Galactic Centre (GC) to be able to study their properties. They also enable us to identify and characterise so far undiscovered young clusters as co-moving groups to constrain recent star formation at the GC. We have discovered the first co-moving group of stars associated with an H II region that can show the presence of a dissolving young cluster. Studying colour-magnitude diagrams shows that the co-moving stars are consistent with being few Myr old post-main sequence stars.
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