Galaxy populations in the Antlia cluster. II. Compact elliptical galaxy candidates
Analia V. Smith Castelli, Favio R. Faifer, Tom Richtler, Lilia P., Bassino

TL;DR
This study analyzes four candidate compact elliptical galaxies in the Antlia cluster, identifying one confirmed and one probable cE galaxy, and discusses their structural features and possible origins based on photometric data.
Contribution
It provides detailed photometric analysis of cE galaxy candidates in Antlia, highlighting new potential progenitors and refining criteria for cE galaxy identification.
Findings
One galaxy shows features consistent with confirmed cE galaxies.
Two candidates are likely not cE galaxies based on structural analysis.
One candidate exhibits signs of interaction and possible progenitor status.
Abstract
We present a photometric analysis of four galaxies classified as compact elliptical (cE) galaxies in the FS90 Antlia Group catalogue. Only 6 members of this rare type of galaxies are known until now. Using data in various photometric systems, we measured brightness and colour profiles, as well as structural parameters. By comparing them with those of other galaxies in the Antlia cluster, as well as with confirmed cE galaxies from the literature, we found that two of the FS90 cE candidates, albeit being spectroscopically confirmed Antlia members, are not cE galaxies. However, one of these objects presents strong ellipticity and position angle variations that resemble those already reported for M32, leading us to speculate about this kind of objects being progenitors of cE galaxies. The other two FS90 cE candidates, for which radial velocities are not available, match some features…
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