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A dynamical mass map of the nearby Fornax galaxy cluster

Published online by Cambridge University Press:  30 October 2025

Avinash Chaturvedi Open the ORCID record for Avinash Chaturvedi [Opens in a new window] ,
Nicola R. Napolitano  and
Michael Hilker Open the ORCID record for Michael Hilker [Opens in a new window]
Avinash Chaturvedi*
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany
Nicola R. Napolitano
Affiliation:
School of Physics and Astronomy, Sun Yat-sen University, Zhuhai Campus, 2 Daxue Road, Xiangzhou District, Zhuhai, P. R. China INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello, 16, 80131-Napoli, Italy
Michael Hilker
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany
*
email: avi.chaturvedi@aip.de
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Abstract

The nearby Fornax cluster (d ∼ 20 Mpc) provides an unparalleled opportunity to investigate the formation and evolution of early-type galaxies in a dense environment. Using the spectroscopic data from the ESO VLT/VIMOS spectrograph of the Fornax cluster, we have kinematically characterised the photometrically detected globular cluster (GC) candidates in the core of the cluster. We confirm a total of 777 GCs with new velocity measurements and compile the most extensive spectroscopic GC sample of 2341 objects in this environment. We used our GC radial velocity catalogue to perform dynamical mass modelling of NGC 1399, the central galaxy of the the Fornax cluster out to its 200 kpc. We find that both cusp (NFW) and core (Burkert) dark matter (DM) halo can produce the observed kinematics. Independent of the DM halo profile used, we find that inclusion of the intra-cluster GCs in mass-modelling can effect the mass-estimate.

Keywords

Fornax galaxy clusterNGC1399globular clusterskinematicsdynamical modelling

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 380 - 386
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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