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How 4MOST and MOONS will improve constraints on the dynamical masses of Local Group galaxies

Published online by Cambridge University Press:  30 October 2025

S. Mieske Open the ORCID record for S. Mieske [Opens in a new window] ,
G. Battaglia ,
A. Bayo ,
M.-R. L. Cioni Open the ORCID record for M.-R. L. Cioni [Opens in a new window] ,
O. González ,
V. Mainieri Open the ORCID record for V. Mainieri [Opens in a new window] ,
A. Mucciarelli ,
L. Schmidtobreick ,
Á. Skúladóttir  and
T. Szeifert
S. Mieske
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Chile
G. Battaglia
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain Universidad de La Laguna, Dpto. Astrofísica, 38206 La Laguna, Tenerife, Spain
A. Bayo
Affiliation:
Instituto de Física y Astronomía, Universidad de Valparaíso, Chile European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
M.-R. L. Cioni
Affiliation:
Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
O. González
Affiliation:
UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
V. Mainieri
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
A. Mucciarelli
Affiliation:
Dipartimento di Fisica e Astronomia “Augusto Righi”, Alma Mater Studiorum, Università di Bologna, Via Gobetti 93/2, I-40129 Bologna, Italy
L. Schmidtobreick
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Chile
Á. Skúladóttir
Affiliation:
Dipartimento di Fisica e Astronomia, Universitá degli Studi di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino, Italy INAF/Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
T. Szeifert*
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Vitacura, Chile
*
email: tszeifer@eso.org
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Abstract

The wide-field spectrographs 4MOST and MOONS are expected to enter operations in late 2024 at the ESO Paranal Observatory. These upcoming survey facilities will play an important role in various fields over the next decade. In particular, both will host surveys aimed at observing Local Group (LG) galaxies. We describe how their scientific performances complement Gaia and other spectroscopic surveys in the field of nearby galaxy kinematics, and provide an overview of the planned surveys that focus on LG galaxy kinematics. We outline the policies for community access to data and observing time, which is different for the two instruments. The contribution concludes with a summary of the main scientific goals of MOONS and 4MOST survey science regarding the LG galaxy masses and dynamics.

Keywords

Galaxy: haloGalaxy: fundamental parametersGalaxies: dwarfsGalaxies: Local GroupGalaxies: kinematics and dynamics

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 49 - 55
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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