期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 497, 期 2, 页码 1571-1582出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa2042
关键词
galaxies: clusters: individual: Fornax; galaxies: dwarf; galaxies: evolution; galaxies: kinematics and dynamics
资金
- Australian Research Council (ARC) - Australian Government [DE190100375]
- University of Sydney Postdoctoral Research Fellowship
- European Southern Observatory (ESO) PhD studentship programme
- European Union'sHorizon 2020 research and innovation program under the Marie Sklodowska-Curie grant [721463]
- RAVET project from the Spanish Ministry of Science, Innovation and Universities (MCIU) [AYA2016-77237-C3-1-P]
- Instituto de Astrofisica de Canarias (IAC) project TRACES through the Consejeria de Economia, Industria, Comercio y Conocimiento of the Canary Islands Autonomous Community
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [724857]
- Emil Aaltonen Foundation
- Australian Research Council (ARC) Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) [CE170100013]
- Australian Research Council [DE190100375] Funding Source: Australian Research Council
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 (10(7.5) < M-* < 10(9.5) M-circle dot) 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 lambda(R) 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 lambda(R) decreases towards lower stellar mass, with a corresponding increase in the proportion of slowly rotating galaxies in this regime. The decrease of lambda(R) 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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