The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies
Abstract Dwarf ellipticals are the most common galaxy type in cluster environments; however, the challenges associated with their observation mean that their formation mechanisms are still poorly understood. To address this, we present deep integral field observations of a sample of 31 low-mass (107...
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ftunivoulu:oai:oulu.fi:nbnfi-fe2020102387537 2023-07-30T04:06:37+02:00 The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies Scott, N. (Nicholas) Eftekhari, F. S. (F. Sara) Peletier, R. F. (Reynier F.) Bryant, J. J. (Julia J.) Bland-Hawthorn, J. (Joss) Capaccioli, M. (Massimo) Croom, S. M. (Scott M.) Drinkwater, M. (Michael) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Lorente, N. F. (Nuria F. P.) Mieske, S. (Steffen) Spavone, M. (Marilena) van de Ven, G. (Glenn) Venhola, A. (Aku) 2020 application/pdf http://urn.fi/urn:nbn:fi-fe2020102387537 eng eng Oxford University Press info:eu-repo/grantAgreement/EC/H2020/721463/EU/SUrvey Network for Deep Imaging Analysis and Learning/SUNDIAL info:eu-repo/semantics/openAccess This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. galaxies: clusters: individual: Fornax galaxies: dwarf galaxies: evolution galaxies: kinematics and dynamics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftunivoulu 2023-07-08T20:00:43Z Abstract Dwarf ellipticals are the most common galaxy type in cluster environments; however, the challenges associated with their observation mean that their formation mechanisms are still poorly understood. To address this, we present deep integral field observations of a sample of 31 low-mass (107.5 < M⋆ < 109.5 M⊙) early-type galaxies in the Fornax cluster with the SAMI instrument. For 21 galaxies, our observations are sufficiently deep to construct spatially resolved maps of the stellar velocity and velocity dispersion — for the remaining galaxies, we extract global velocities and dispersions from aperture spectra only. From the kinematic maps, we measure the specific stellar angular momentum λR of the lowest mass dE galaxies to date. Combining our observations with early-type galaxy data from the literature spanning a large range in stellar mass, we find that λR decreases towards lower stellar mass, with a corresponding increase in the proportion of slowly rotating galaxies in this regime. The decrease of λR with mass in our sample dE galaxies is consistent with a similar trend seen in somewhat more massive spiral galaxies from the CALIFA survey. This suggests that the degree of dynamical heating required to produce dEs from low-mass starforming progenitors may be relatively modest and consistent with a broad range of formation mechanisms. 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: clusters: individual: Fornax galaxies: dwarf galaxies: evolution galaxies: kinematics and dynamics |
spellingShingle |
galaxies: clusters: individual: Fornax galaxies: dwarf galaxies: evolution galaxies: kinematics and dynamics Scott, N. (Nicholas) Eftekhari, F. S. (F. Sara) Peletier, R. F. (Reynier F.) Bryant, J. J. (Julia J.) Bland-Hawthorn, J. (Joss) Capaccioli, M. (Massimo) Croom, S. M. (Scott M.) Drinkwater, M. (Michael) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Lorente, N. F. (Nuria F. P.) Mieske, S. (Steffen) Spavone, M. (Marilena) van de Ven, G. (Glenn) Venhola, A. (Aku) The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies |
topic_facet |
galaxies: clusters: individual: Fornax galaxies: dwarf galaxies: evolution galaxies: kinematics and dynamics |
description |
Abstract Dwarf ellipticals are the most common galaxy type in cluster environments; however, the challenges associated with their observation mean that their formation mechanisms are still poorly understood. To address this, we present deep integral field observations of a sample of 31 low-mass (107.5 < M⋆ < 109.5 M⊙) early-type galaxies in the Fornax cluster with the SAMI instrument. For 21 galaxies, our observations are sufficiently deep to construct spatially resolved maps of the stellar velocity and velocity dispersion — for the remaining galaxies, we extract global velocities and dispersions from aperture spectra only. From the kinematic maps, we measure the specific stellar angular momentum λR of the lowest mass dE galaxies to date. Combining our observations with early-type galaxy data from the literature spanning a large range in stellar mass, we find that λR decreases towards lower stellar mass, with a corresponding increase in the proportion of slowly rotating galaxies in this regime. The decrease of λR with mass in our sample dE galaxies is consistent with a similar trend seen in somewhat more massive spiral galaxies from the CALIFA survey. This suggests that the degree of dynamical heating required to produce dEs from low-mass starforming progenitors may be relatively modest and consistent with a broad range of formation mechanisms. |
format |
Article in Journal/Newspaper |
author |
Scott, N. (Nicholas) Eftekhari, F. S. (F. Sara) Peletier, R. F. (Reynier F.) Bryant, J. J. (Julia J.) Bland-Hawthorn, J. (Joss) Capaccioli, M. (Massimo) Croom, S. M. (Scott M.) Drinkwater, M. (Michael) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Lorente, N. F. (Nuria F. P.) Mieske, S. (Steffen) Spavone, M. (Marilena) van de Ven, G. (Glenn) Venhola, A. (Aku) |
author_facet |
Scott, N. (Nicholas) Eftekhari, F. S. (F. Sara) Peletier, R. F. (Reynier F.) Bryant, J. J. (Julia J.) Bland-Hawthorn, J. (Joss) Capaccioli, M. (Massimo) Croom, S. M. (Scott M.) Drinkwater, M. (Michael) Falcón-Barroso, J. (Jésus) Hilker, M. (Michael) Iodice, E. (Enrichetta) Lorente, N. F. (Nuria F. P.) Mieske, S. (Steffen) Spavone, M. (Marilena) van de Ven, G. (Glenn) Venhola, A. (Aku) |
author_sort |
Scott, N. (Nicholas) |
title |
The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies |
title_short |
The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies |
title_full |
The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies |
title_fullStr |
The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies |
title_full_unstemmed |
The SAMI–Fornax Dwarfs Survey I:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies |
title_sort |
sami–fornax dwarfs survey i:sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies |
publisher |
Oxford University Press |
publishDate |
2020 |
url |
http://urn.fi/urn:nbn:fi-fe2020102387537 |
genre |
sami |
genre_facet |
sami |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/721463/EU/SUrvey Network for Deep Imaging Analysis and Learning/SUNDIAL |
op_rights |
info:eu-repo/semantics/openAccess This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
_version_ |
1772819343345713152 |