On the accretion of a new group of galaxies on to Virgo : I. Internal kinematics of nine in-falling dEs
Bidaran, Bahar; Pasquali, Anna; Lisker, Thorsten; Coccato, Lodovico; Falcón-Barroso, Jesus; van de Ven, Glenn; Peletier, Reynier; Emsellem, Eric; Grebel, Eva K.; La Barbera, Francesco; Janz, Joachim; Sybilska, Agnieszka; Vijayaraghavan, Rukmani; Gallagher, John, III; Gadotti, Dimitri A. (2020-07-20)
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, https://doi.org/10.1093/mnras/staa2097
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.
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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