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Dwarf Properties and Satellite Planes Beyond the Local Volume

Published online by Cambridge University Press:  30 October 2025

N. Heesters Open the ORCID record for N. Heesters [Opens in a new window] ,
O. Müller ,
R. Habas ,
F. Marleau ,
P.-A. Duc ,
M. Poulain ,
R. Sánchez-Janssen ,
P. Durrell ,
S. Lim  and
S. Paudel
N. Heesters*
Affiliation:
École Polytechnique Fédéale de Lausanne (EPFL), 1290 Sauverny, Switzerland
O. Müller
Affiliation:
École Polytechnique Fédéale de Lausanne (EPFL), 1290 Sauverny, Switzerland
R. Habas
Affiliation:
Observatoire Astronomique de Strasbourg (ObAS), Universite de Strasbourg - CNRS, UMR 7550 Strasbourg, France
F. Marleau
Affiliation:
Universität Innsbruck, Technikerstraße 25/8, Innsbruck, A-6020, Austria
P.-A. Duc
Affiliation:
Observatoire Astronomique de Strasbourg (ObAS), Universite de Strasbourg - CNRS, UMR 7550 Strasbourg, France
M. Poulain
Affiliation:
University of Oulu, P.O. Box 3000, FI-90014, Oulu, Finland
R. Sánchez-Janssen
Affiliation:
UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
P. Durrell
Affiliation:
Youngstown State University, One University Plaza, Youngstown, OH 44555 USA
S. Lim
Affiliation:
Yonsei University, Seoul 03722
S. Paudel
Affiliation:
Yonsei University, Seoul 03722
*
email: nick.heesters@epfl.ch
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Abstract

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Dwarf satellite galaxies in our Milky Way and different galaxy systems in the Local Volume appear to be arranged in thin, vast planes. It has been argued that these phase-space correlations cannot be explained to a satisfactory degree by the ΛCDM paradigm but it is unclear whether these planes in our neighborhood are statistical outliers, or if they are perhaps a common phenomenon in the Universe. Recent deep imaging surveys have significantly increased the number of known dwarf galaxies and allow us to advance such small-scale tensions beyond the Local Volume. We present our study analyzing the spatial distribution of 2210 dwarf galaxies identified in the MATLAS survey as well as results from follow-up observations with the MUSE instrument on the VLT. Spectral information for 56 of these dwarf galaxies allow for a deeper dive into their properties and for a comparison to the Local Volume dwarfs.

Keywords

Cosmology: dark matterCosmology: observationGalaxies: dwarf

Information

Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 319 - 323
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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