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  • MWGaia News: STSM visits and WG1/WG4 Workshop: The Galactic Centre and Inner Galaxy

Dear All:

a) The MW-Gaia STSM exchange visit programme is now set up as anOpen Call - proposals are welcome at anytime. They are reviewed on a monthly basis, with proposals received by the end of the month being reviewed at the start of the following month.
Because COST have recently announced the extension of the current Grant Period through to end Oct 2021, STSM proposals are now
accepted for visits scheduled such that they must have completed by 30 Sep 2021.
For further details see https://www.mw-gaia.org/participate/stsm-visits/

b) The WG1/WG4 workshop "The Galactic Centre and Inner Galaxy" will take place 10-12 February 10 2021. This workshop is run online and virtually in Heidelberg.

• Further information about the workshop is available on the workshop's website at https://zah.uni-heidelberg.de/mw-gaia2021
• Workshop Registration is open until 10 January 2021. No fees will be charged for participating, the number of participants however is limited.
• Abstracts of contributed talks and ePosters need to be submitted on or before 10 January 2021.

Thematic Overview

The inner regions of our Milky Way are dominated by the Galactic bar and a classical bulge. The barred potential causes gas to flow
inwards and form stars in the central few 100 parsecs. Over time this process may have built up the nuclear stellar disk, also found
at these radii. At the very centre, the nuclear star cluster surrounds the Galactic supermassive black hole, Sgr A*. The larger inner bulge region also contains the highest-density parts of the Milky Way's stellar halo, and perhaps a classical bulge component.

The next Gaia data release EDR3 will be released on Dec. 3, 2020, and will be based on 34 months of observations. Compared to DR2 improvements in completeness and astrometry (20% in parallaxes, factor of two in proper motion) will be provided. Additionally, more information on the parallax zero point will be included and the basis of the Celestial Reference Frame (CRF) will be extended to 1.5 million objects, a factor of three more.

During this 3 day workshop in (virtual) Heidelberg, we will focus on the impact of the ultra-precise Gaia astrometry on our understanding of the structure and dynamics of the Galactic bar and bulge region including the interrelation with the inner halo, the nuclear stellar disc and the central star cluster. Chemical enrichment, ages and the assembly history will also be covered. The celestial reference frame, zero points of parallaxes and proper motions, as well as questions of fundamental physics will be discussed. Also first results based on EDR3 are expected.

Topics Covered

• Gaia EDR3: overview, completeness
• Gaia Ref Frame: zero points in parallax and proper motion,
fundamental physics and relativistic effects using Gaia and VLBI,
Sgr A* and testing GR
• Bulge, Bar and Inner Halo: kinematics, dynamics, mass distribution
• Bulge, Bar, Inner Halo: metallicity-orbit distribution and stellar ages
• Bulge, Bar, Inner Halo: critical discussion on stellar ages in
Bulge, assembly history from (hydro-)dynamical and cosmological
simulations
• Nuclear Disk, Gas Inflow and Star Formation

Mode of Workshop

This workshop is based on invited key presentations and contributed talks, ePosters, a practical hands-on session for EDR3, and
dedicated discussions. It will be run online via ZOOM and Slack.

Dr Nicholas A. Walton
Institute of Astronomy Tel: +44 1223 337503
University of Cambridge Fax: +44 1223 337523
Madingley Road WWW: http://www.ast.cam.ac.uk/~naw
Cambridge, CB3 0HA email: naw@ast.cam.ac.uk

 

Actualizado el 23/12/2020