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Accepted manuscript

Rotation of the Globular Cluster Population of the Dark Matter Deficient Galaxy NGC 1052-DF4: Implication for the total mass

Published online by Cambridge University Press:  23 May 2024

Yuan (Cher) Li Open the ORCID record for Yuan (Cher) Li [Opens in a new window] ,
Brendon J. Brewer  and
Geraint F. Lewis Open the ORCID record for Geraint F. Lewis [Opens in a new window]
Yuan (Cher) Li*
Affiliation:
Department of Statistics, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Brendon J. Brewer
Affiliation:
Department of Statistics, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
Geraint F. Lewis
Affiliation:
Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia
*
Author for correspondence: Y. Li, Email: yli464@aucklanduni.ac.nz.
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Abstract

We explore the globular cluster population of NGC 1052-DF4, a dark matter deficient galaxy, using Bayesian inference to search for the presence of rotation. The existence of such a rotating component is relevant to the estimation of the mass of the galaxy, and therefore the question of whether NGC 1052-DF4 is truly deficient of dark matter,similar to NGC 1052-DF2, another galaxy in the same group. The rotational characteristics of seven globular clusters in NGC 1052-DF4 were investigated, finding that a non-rotating kinematic model has a higher Bayesian evidence than a rotating model, by a factor of approximately 2.5. In addition, we find that under the assumption of rotation, its amplitude must be small. This distinct lack of rotation strengthens the case that, based on its intrinsic velocity dispersion, NGC 1052-DF4 is a truly dark matter deficient galaxy.

Type
Research Article
Information
Publications of the Astronomical Society of Australia , Accepted manuscript , pp. 1 - 10
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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