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The Dark Matter Density Profiles of Antlia B

Published online by Cambridge University Press:  30 October 2025

Mariana P. Júlio Open the ORCID record for Mariana P. Júlio [Opens in a new window] ,
Jarle Brinchmann ,
Justin I. Read  and
The MUSE Collaboration
Mariana P. Júlio*
Affiliation:
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, PT4169-007 Porto, Portugal Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
Jarle Brinchmann
Affiliation:
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT4150-762 Porto, Portugal Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands
Justin I. Read
Affiliation:
University of Surrey, Physics Department, Guildford, GU2 7XH, UK
*
email: mpouseirojulio@aip.de
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Abstract

We use spectroscopic observations of Antlia B, a distant (d ∼ 1.35 Mpc) faint dwarf galaxy (MV = −9.7, M* =105 M⊙), from MUSE-Faint, to explore alternative dark matter (DM) models to Λ CDM, which are one possible explanation for the small-scale problems in the standard model.

We measure line-of-sight velocities of 127 stars, and combine these with GravSphere, a Jeans modelling code, to place constraints on DM models and derive the first DM density profiles for this object.

We present constraints on the nature of self-interacting DM, in which DM particles can interact with one another in the form of annihilation (we find a core radius of rc ≲ 69 pc) and on scalar field DM, comprised of ultralight bosons that form a Bose-Einstein Condensate (we find a characteristic length scale of the self-interaction of RTF ≲ 180 pc). These results suggest that we can rule out these models as an explanation for the cores in the larger dwarf galaxies in the Local Group.

Keywords

Dark MatterGalaxiesAntlia BKinematicsDynamicsSpectroscopy

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 147 - 153
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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