University of Oulu

Nicholas Scott, F Sara Eftekhari, Reynier F Peletier, Julia J Bryant, Joss Bland-Hawthorn, Massimo Capaccioli, Scott M Croom, Michael Drinkwater, Jésus Falcón-Barroso, Michael Hilker, Enrichetta Iodice, Nuria F P Lorente, Steffen Mieske, Marilena Spavone, Glenn van de Ven, Aku Venhola, The SAMI–Fornax Dwarfs Survey I: sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies, Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 2, September 2020, Pages 1571–1582, https://doi.org/10.1093/mnras/staa2042

The SAMI–Fornax Dwarfs Survey I : sample, observations, and the specific stellar angular momentum of dwarf elliptical galaxies

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Author: Scott, Nicholas1,2; Eftekhari, F. Sara3; Peletier, Reynier F.3;
Organizations: 1Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW, 2006, Australia
2ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)
3Kapteyn Institute, University of Groningen, Landleven 12, NL-9747, AD, Groningen, The Netherlands
4University of Naples Federico II, C.U. Monte Sant’Angelo, Via Cinthia, I-80126, Naples, Italy
5School of Mathematics and Physics, The University of Queensland, St Lucia, QLD 4072, Australia
6Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
7Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
8ESO, European Southern Observatory, Karl-Schwarzschild-Str 2, D-85748 Garching bei München, Germany
9INAF, Astronomical Observatory of Capodimonte, via Moiariello 16, I-80131 Napoli, Italy
10Australian Astronomical Optics, AAO-MQ, Faculty of Science and Engineering, Macquarie University, NSW 2109, Australia
11European Southern Observatory, Alonso de Cordova 3107, 7630355 Vitacura, Santiago, Chile
12Department of Astrophysics, University Vienna, Türkenschanzstrasse 17, A-1180 Wien, Austria
13Space physics and astronomy research unit, University of Oulu, Pentti Kaiteran katu 1, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2020102387537
Language: English
Published: Oxford University Press, 2020
Publish Date: 2020-10-23
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.

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Series: Monthly notices of the Royal Astronomical Society
ISSN: 0035-8711
ISSN-E: 1365-8711
ISSN-L: 0035-8711
Volume: 497
Issue: 2
Pages: 1571 - 1582
DOI: 10.1093/mnras/staa2042
OADOI: https://oadoi.org/10.1093/mnras/staa2042
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: NS acknowledges support of an Australian Research Council (ARC) Discovery Early Career Research Award (project number DE190100375) funded by the Australian Government and a University of Sydney Postdoctoral Research Fellowship. SE acknowledges funding support by the European Southern Observatory (ESO) PhD studentship programme. RFP acknowledges financial support from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement no. 721463 to the SUNDIAL ITN network. JF-B has been supported through the RAVET project by the grant AYA2016-77237-C3-1-P from the Spanish Ministry of Science, Innovation and Universities (MCIU) and through the Instituto de Astrofísica de Canarias (IAC) project TRACES, which is partially supported through the state budget and the regional budget of the Consejería de Economía, Industria, Comercio y Conocimiento of the Canary Islands Autonomous Community. GvdV acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 724857 (Consolidator Grant ArcheoDyn). AV acknowledges financial support from the Emil Aaltonen Foundation. Parts of this research were supported by the Australian Research Council (ARC) Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013.
Copyright information: 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.