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Implications for the Origin of Early-type Dwarf Galaxies: A Detailed Look at the Isolated Rotating Early-type Dwarf Galaxy LEDA 2108986 (CG 611), Ramifications for the Fundamental Plane's S2 K Kinematic Scaling, and the Spin-Ellipticity Diagram

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posted on 2024-07-26, 14:23 authored by Alister GrahamAlister Graham, Joachim Janz, Samantha J. Penny, Igor V. Chilingarian, Bogdan C. Ciambur, Duncan ForbesDuncan Forbes, Roger L. Davies
Selected from a sample of nine, isolated, dwarf early-type galaxies (ETGs) with the same range of kinematic properties as dwarf ETGs in clusters, we use LEDA 2108986 (CG 611) to address the nature versus nurture debate regarding the formation of dwarf ETGs. The presence of faint disk structures and rotation within some cluster dwarf ETGs has often been heralded as evidence that they were once late-type spiral or dwarf irregular galaxies prior to experiencing a cluster-induced transformation into an ETG. However, CG 611 also contains significant stellar rotation (≈20 km s-1) over its inner half-light radius (Re,maj = 0.71 kpc), and its stellar structure and kinematics resemble those of cluster ETGs. In addition to hosting a faint young nuclear spiral within a possible intermediate-scale stellar disk, CG 611 has accreted an intermediate-scale, counter-rotating gas disk. It is therefore apparent that dwarf ETGs can be built by accretion events, as opposed to disk-stripping scenarios. We go on to discuss how both dwarf and ordinary ETGs with intermediate-scale disks, whether under (de)construction or not, are not fully represented by the kinematic scaling S0.5 = √0.5 V2rot + σ2, and we also introduce a modified spin-ellipticity diagram λ (R)-ϵ (R) with the potential to track galaxies with such disks.

Funding

DP17012923:ARC

History

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PDF (Published version)

ISSN

1538-4357

Journal title

Astrophysical Journal

Volume

840

Issue

2

Article number

article no. 68

Pagination

1 p

Publisher

Institute of Physics Publishing, Inc.

Copyright statement

Copyright © 2017. The American Astronomical Society. All rights reserved. The published version is reproduced here in accordance with the copyright policy of the publisher and can be also be located at https://doi.org/10.3847/1538-4357/aa6e56.

Language

eng

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