University of Oulu

Bahar Bidaran, Anna Pasquali, Thorsten Lisker, Lodovico Coccato, Jesus Falcón-Barroso, Glenn van de Ven, Reynier Peletier, Eric Emsellem, Eva K Grebel, Francesco La Barbera, Joachim Janz, Agnieszka Sybilska, Rukmani Vijayaraghavan, John Gallagher, III, Dimitri A Gadotti, On the accretion of a new group of galaxies on to Virgo: I. Internal kinematics of nine in-falling dEs, Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 2, September 2020, Pages 1904–1924,

On the accretion of a new group of galaxies on to Virgo : I. Internal kinematics of nine in-falling dEs

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Author: Bidaran, Bahar1; Pasquali, Anna1; Lisker, Thorsten1;
Organizations: 1Astronomisches Rechen-Institut , Zentrum für Astronomie der Universität Heidelberg, Mönchhofstraße 12-14, D-69120 Heidelberg, Germany
2European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
3Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
4Departamento de Astrofísica, Universidad de La Laguna, E-38200 La Laguna, Tenerife, Spain
5Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria
6Kapteyn Astronomical Institute, University of Groningen, Postbus 800, NL-9700 AV Groningen, the Netherlands
7INAF-Osservatorio Astronomico di Capodimonte, sal. Moiariello 16, I-80131 Napoli, Italy
8Space Science and Astronomy, University of Oulu, PO Box 3000, FI-90014 Oulu, Finland
9Finnish Centre of Astronomy with ESO (FINCA), University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland
10Sybilla Technologies, Torunska 59, PL-85-023 Bydgoszcz, Poland
11Department of Astronomy, University of Virginia, 530 McCormick Road, Charlottesville, VA 22904, USA
12Department of Astronomy, University of Wisconsin-Madison, 475 N. Charter Street, Madison, WI 53076-1582, USA
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 18.2 MB)
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Language: English
Published: Oxford University Press, 2020
Publish Date: 2020-10-22


Galaxy environment has been shown to play an important role in transforming late-type, star-forming galaxies to quiescent spheroids. This transformation is expected to be more severe for low-mass galaxies (⁠M < 10¹⁰ M⁠) in dense galaxy groups and clusters, mostly due to the influence of their past host haloes (also known as pre-processing) and their present-day environments. For the first time, in this study, we investigate a sample of nine early-type dwarf galaxies (dEs) that were accreted as a likely bound group on to the Virgo galaxy cluster about 2–3 Gyr ago. Considering this special condition, these nine dEs may provide a test bed for distinguishing between the influence of the Virgo galaxy cluster and the effects of the previous host halo on their current properties. Specifically, we use VLT/MUSE integral-field unit spectra to derive their kinematics and specific angular momentum (λR) profiles. We observe a spread in the λR profiles of our sample dEs, finding that the λR profiles of half of them are as high as those of low-mass field galaxies. The remaining dEs exhibit λR profiles as low as those of Virgo dEs that were likely accreted longer ago. Moreover, we detect nebular emission in one dE with a gas velocity offset suggesting ongoing gas stripping in Virgo. We suggest that the low-λR dEs in our sample were processed by their previous host halo, prior to their infall to Virgo, and that the high-λR dEs may be experiencing ram pressure stripping in Virgo.

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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: 1904 - 1924
DOI: 10.1093/mnras/staa2097
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: We acknowledge 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. We would like to thank Jakob Walcher, Jorge Iglesias, J.K Barrera-Ballesteros, D.J. Bomans, A. Miskolczi, and B. Biskup for providing environmental information for the CALIFA sample. BB acknowledges the support of the International Max Planck Research School (IMPRS) for Astronomy and Cosmic Physics at the University of Heidelberg. JFB acknowledges support 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 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).
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.