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
Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2015
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. 18 dwarf ellipticals (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 σ-luminosity relation. Two of the Virgo dwarfs, VCC 1199 and VCC 1627, have among the highest central velocity dispersions (σ0 = 58.4 and 49.2 km s-1) measured for dwarfs of their luminosity (MR3+ ≈ -17). Given thei..View full abstract
Awarded by Australian Research Council Super Science Postdoctoral Fellowship
Awarded by ARC
Awarded by National Science Foundation
SJP acknowledges the support of an Australian Research Council Super Science Postdoctoral Fellowship grant FS110200047 and post-doctoral funding from the University of Portsmouth. JJ and DAF thank the ARC for financial support via DP130100388. We thank Caroline Foster, Nicola Pastorello, and Vincenzo Pota for their assistance with our observations. We thank the referee whose comments helped improve this paper. This project made use of the NASA Extragalactic Database (NED) and data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. We thank the staff of the W. M. Keck Observatory for their support. Some the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. This work was supported in part by National Science Foundation Grant No. PHYS-1066293 and the hospitality of the Aspen Center for Physics. We wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.