Skip to main content

Research Repository

Advanced Search

Imposters among us: globular cluster kinematics and the halo mass of ultra-diffuse galaxies in clusters

Doppel, Jessica E; Sales, Laura V; Benavides, José A; Toloba, Elisa; Peng, Eric W; Nelson, Dylan; Navarro, Julio F

Imposters among us: globular cluster kinematics and the halo mass of ultra-diffuse galaxies in clusters Thumbnail


Authors

Jess Doppel jessica.e.doppel@durham.ac.uk
Postdoctoral Research Associate

Laura V Sales

José A Benavides

Elisa Toloba

Eric W Peng

Dylan Nelson

Julio F Navarro



Abstract

The velocity dispersion of globular clusters (GCs) around ultra-diffuse galaxies (UDGs) in the Virgo cluster spans a wide range, including cases where GC kinematics suggest haloes as massive as (or even more massive than) that of the Milky Way around these faint dwarfs. We analyse the catalogues of GCs derived in post-processing from the TNG50 cosmological simulation to study the GC system kinematics and abundance of simulated UDGs in galaxy groups and clusters. UDGs in this simulation reside exclusively in dwarf-mass haloes with M200 ≲ 1011.2 M⊙. When considering only GCs gravitationally bound to simulated UDGs, we find GCs properties that overlap well with several observational measurements for UDGs. In particular, no bias towards overly massive haloes is inferred from the study of bound GCs, confirming that GCs are good tracers of UDG halo mass. However, we find that contamination by intracluster GCs may, in some cases, substantially increase velocity dispersion estimates when performing projected mock observations of our sample. We caution that targets with less than 10 GC tracers are particularly prone to severe uncertainties. Measuring the stellar kinematics of the host galaxy should help confirm the unusually massive haloes suggested by GC kinematics around some UDGs.

Citation

Doppel, J. E., Sales, L. V., Benavides, J. A., Toloba, E., Peng, E. W., Nelson, D., & Navarro, J. F. (2024). Imposters among us: globular cluster kinematics and the halo mass of ultra-diffuse galaxies in clusters. Monthly Notices of the Royal Astronomical Society, 529(2), 1827-1838. https://doi.org/10.1093/mnras/stae647

Journal Article Type Article
Acceptance Date Mar 1, 2024
Online Publication Date Mar 4, 2024
Publication Date Mar 6, 2024
Deposit Date May 15, 2024
Publicly Available Date May 15, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 529
Issue 2
Pages 1827-1838
DOI https://doi.org/10.1093/mnras/stae647
Public URL https://durham-repository.worktribe.com/output/2441294

Files

Published Journal Article (1.9 Mb)
PDF

Licence
http://creativecommons.org/licenses/by/4.0/

Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.




Downloadable Citations