The scaling relations of early-type dwarf galaxies across a range of environments

Samantha J. Penny, Joachim Janz, Duncan A. Forbes, Andrew J. Benson, Jeremy Mould

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Abstract

We present the results of a Keck-ESI study of dwarf galaxies across a range of environment: the Perseus Cluster, the Virgo Cluster, the NGC 1407 group, and the NGC 1023 group. Eighteen dEs are targeted for spectroscopy, three for the first time. We confirm cluster membership for one Virgo dE, and group membership for one dE in the NGC 1023 group, and one dE in the NGC 1407 group for the first time. Regardless of environment, the dEs follow the same size-magnitude and $\sigma$-luminosity relation. Two of the Virgo dwarfs, VCC 1199 and VCC 1627, have among the highest central velocity dispersions ($\sigma_{0}$ = 58.4 km s$^{-1}$ and 49.2 km s$^{-1}$) measured for dwarfs of their luminosity ($M_{R}\approx -17$). Given their small sizes ($R_{e}
Original languageEnglish
Pages (from-to)3635-3648
JournalMonthly Notices of the Royal Astronomical Society
Volume453
Issue number4
Early online date9 Sep 2015
DOIs
Publication statusPublished - 2015

Keywords

  • astro-ph.GA
  • galaxies: dwarf
  • galaxies: evolution
  • galaxies: kinematics and dynamics

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