Publication Date
6-1-2021
Document Type
Article
Publication Title
Monthly Notices of the Royal Astronomical Society
Volume
503
Issue
4
DOI
10.1093/mnras/stab805
First Page
5455
Last Page
5472
Abstract
We present spatially resolved two-dimensional maps and radial trends of the stellar populations and kinematics for a sample of six compact elliptical galaxies (cE) using spectroscopy from the Keck Cosmic Web Imager (KCWI). We recover their star formation histories, finding that all except one of our cEs are old and metal rich, with both age and metallicity decreasing toward their outer radii. We also use the integrated values within one effective radius to study different scaling relations. Comparing our cEs with others from the literature and from simulations we reveal the formation channel that these galaxies might have followed. All our cEs are fast rotators, with relatively high rotation values given their low ellipticites. In general, the properties of our cEs are very similar to those seen in the cores of more massive galaxies, and in particular, to massive compact galaxies. Five out of our six cEs are the result of stripping a more massive (compact or extended) galaxy, and only one cE is compatible with having been formed intrinsically as the low-mass compact object that we see today. These results further confirm that cEs are a mixed-bag of galaxies that can be formed following different formation channels, reporting for the first time an evolutionary link within the realm of compact galaxies (at all stellar masses).
Funding Number
1828315
Funding Sponsor
National Science Foundation
Keywords
galaxies: evolution, galaxies: formation, galaxies: kinematics and dynamics, galaxies: stellar content
Department
Physics and Astronomy
Recommended Citation
Anna Ferré-Mateu, Mark Durré, Duncan A. Forbes, Aaron J. Romanowsky, Adebusola Alabi, Jean P. Brodie, and Richard M. McDermid. "Low-mass compact elliptical galaxies: Spatially resolved stellar populations and kinematics with the Keck Cosmic Web Imager" Monthly Notices of the Royal Astronomical Society (2021): 5455-5472. https://doi.org/10.1093/mnras/stab805
Comments
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.