The SAMI -- Fornax Dwarfs Survey II: The Stellar Mass Fundamental Plane and the Dark Matter fraction of Dwarf Galaxies
F. Sara Eftekhari (1), Reynier F. Peletier (1), Nicholas Scott (2,3),, Steffen Mieske (4), Joss Bland-Hawthorn (2,3), Julia J. Bryant (2,3), Michele, Cantiello (5), Scott M. Croom (2,3), Michael J. Drinkwater (6), Jesus, Falcon-Barroso (7,9), Michael Hilker (9)

TL;DR
This study analyzes the kinematic scaling relations of 38 dwarf galaxies in the Fornax Cluster, focusing on the Fundamental Plane and Stellar Mass Plane, revealing dark matter fraction trends and environmental influences.
Contribution
It introduces a robust method to estimate dark matter fractions in dwarf galaxies using the Stellar Mass Plane and compares these relations across different environments.
Findings
Faintest dwarfs have higher dark matter fractions.
Dwarf galaxies follow the Stellar Mass Plane with low scatter.
Dark matter dominates in low-mass dwarf galaxies.
Abstract
We explore the kinematic scaling relations of 38 dwarf galaxies in the Fornax Cluster using observations from the SAMI integral field spectrograph. We focus on the Fundamental Plane (FP), defined by the physical properties of the objects (scale length, surface brightness and velocity dispersion) and the Stellar Mass (Fundamental) Plane, where surface brightness is replaced by stellar mass, and investigate their dynamical-to-stellar-mass ratio. We confirm earlier results that the Fornax dEs are significantly offset above the FP defined by massive, hot stellar systems. For the Stellar Mass (Fundamental) Plane, which shows much lower scatter, we find that young and old dwarf galaxies lie at about the same distance from the plane, all with comparable scatter. We introduce the perpendicular deviation of dwarf galaxies from the Stellar Mass Plane defined by giant early-types as a robust…
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