The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of 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 dispe...
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Oxford University Press
2022
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ftunivoulu:oai:oulu.fi:nbnfi-fe2023062861211 2023-07-30T04:06:37+02:00 The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of dwarf galaxies Eftekhari, F. S. (F Sara) Peletier, R. F. (Reynier F) Scott, N. (Nicholas) Mieske, S. (Steffen) Bland-Hawthorn, J. (Joss) Bryant, J. J. (Julia J) Cantiello, M. (Michele) Croom, S. M. (Scott M) Drinkwater, M. J. (Michael J) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Napolitano, N. R. (Nicola R) Spavone, M. (Marilena) Valentijn, E. A. (Edwin A) van de Ven, G. (Glenn) Venhola, A. (Aku) 2022 application/pdf http://urn.fi/urn:nbn:fi-fe2023062861211 eng eng Oxford University Press info:eu-repo/semantics/openAccess © The Author(s) 2022. 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. https://creativecommons.org/licenses/by/4.0/ Galaxies: dark matter galaxies: clusters: individual (Fornax) galaxies: dwarf galaxies: kinematics and dynamics galaxies: stellar content info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftunivoulu 2023-07-08T20:02:05Z 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 estimate of their DM fraction, and find that the faintest dwarfs are systematically offset above the plane, implying that they have a higher dark matter fraction. This result is confirmed when estimating the dynamical mass of our dEs using a virial mass estimator, tracing the onset of dark matter domination in low mass stellar systems. We find that the position of our galaxies on the Stellar Mass FP agrees with the galaxies in the Local Group. This seems to imply that the processes determining the position of dwarf galaxies on the FP depend on the environment in the same way, whether the galaxy is situated in the Local Group or in the Fornax Cluster. Article in Journal/Newspaper sami Jultika - University of Oulu repository |
institution |
Open Polar |
collection |
Jultika - University of Oulu repository |
op_collection_id |
ftunivoulu |
language |
English |
topic |
Galaxies: dark matter galaxies: clusters: individual (Fornax) galaxies: dwarf galaxies: kinematics and dynamics galaxies: stellar content |
spellingShingle |
Galaxies: dark matter galaxies: clusters: individual (Fornax) galaxies: dwarf galaxies: kinematics and dynamics galaxies: stellar content Eftekhari, F. S. (F Sara) Peletier, R. F. (Reynier F) Scott, N. (Nicholas) Mieske, S. (Steffen) Bland-Hawthorn, J. (Joss) Bryant, J. J. (Julia J) Cantiello, M. (Michele) Croom, S. M. (Scott M) Drinkwater, M. J. (Michael J) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Napolitano, N. R. (Nicola R) Spavone, M. (Marilena) Valentijn, E. A. (Edwin A) van de Ven, G. (Glenn) Venhola, A. (Aku) The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of dwarf galaxies |
topic_facet |
Galaxies: dark matter galaxies: clusters: individual (Fornax) galaxies: dwarf galaxies: kinematics and dynamics galaxies: stellar content |
description |
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 estimate of their DM fraction, and find that the faintest dwarfs are systematically offset above the plane, implying that they have a higher dark matter fraction. This result is confirmed when estimating the dynamical mass of our dEs using a virial mass estimator, tracing the onset of dark matter domination in low mass stellar systems. We find that the position of our galaxies on the Stellar Mass FP agrees with the galaxies in the Local Group. This seems to imply that the processes determining the position of dwarf galaxies on the FP depend on the environment in the same way, whether the galaxy is situated in the Local Group or in the Fornax Cluster. |
format |
Article in Journal/Newspaper |
author |
Eftekhari, F. S. (F Sara) Peletier, R. F. (Reynier F) Scott, N. (Nicholas) Mieske, S. (Steffen) Bland-Hawthorn, J. (Joss) Bryant, J. J. (Julia J) Cantiello, M. (Michele) Croom, S. M. (Scott M) Drinkwater, M. J. (Michael J) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Napolitano, N. R. (Nicola R) Spavone, M. (Marilena) Valentijn, E. A. (Edwin A) van de Ven, G. (Glenn) Venhola, A. (Aku) |
author_facet |
Eftekhari, F. S. (F Sara) Peletier, R. F. (Reynier F) Scott, N. (Nicholas) Mieske, S. (Steffen) Bland-Hawthorn, J. (Joss) Bryant, J. J. (Julia J) Cantiello, M. (Michele) Croom, S. M. (Scott M) Drinkwater, M. J. (Michael J) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Napolitano, N. R. (Nicola R) Spavone, M. (Marilena) Valentijn, E. A. (Edwin A) van de Ven, G. (Glenn) Venhola, A. (Aku) |
author_sort |
Eftekhari, F. S. (F Sara) |
title |
The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of dwarf galaxies |
title_short |
The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of dwarf galaxies |
title_full |
The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of dwarf galaxies |
title_fullStr |
The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of dwarf galaxies |
title_full_unstemmed |
The SAMI–Fornax Dwarfs Survey:II. The Stellar Mass Fundamental Plane and the dark matter fraction of dwarf galaxies |
title_sort |
sami–fornax dwarfs survey:ii. the stellar mass fundamental plane and the dark matter fraction of dwarf galaxies |
publisher |
Oxford University Press |
publishDate |
2022 |
url |
http://urn.fi/urn:nbn:fi-fe2023062861211 |
genre |
sami |
genre_facet |
sami |
op_rights |
info:eu-repo/semantics/openAccess © The Author(s) 2022. 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. https://creativecommons.org/licenses/by/4.0/ |
_version_ |
1772819348314914816 |