fossil group
(apparent remnant of a galaxy group)
A fossil group (fossil galaxy group) is what appears to have
been a galaxy group, currently consisting of just one large
elliptical galaxy surrounded by considerable X-ray-emitting
plasma much like an intracluster medium (ICM). It is presumed that the
galaxies of a former group merged to form the
remaining galaxy.
(galaxy clusters,galaxies)
Further reading:
https://en.wikipedia.org/wiki/Galaxy_group#Fossil_groups
https://astronomy.swin.edu.au/cosmos/F/Fossil+Groups
https://ui.adsabs.harvard.edu/abs/2021Univ....7..132A/abstract
https://ui.adsabs.harvard.edu/abs/2011A%26A...527A.143A/abstract
https://ui.adsabs.harvard.edu/abs/2009AN....330..978E/abstract
https://arxiv.org/abs/0910.4171
https://ui.adsabs.harvard.edu/abs/2007AJ....134.1551S/abstract
https://ui.adsabs.harvard.edu/abs/2007IAUS..235..160M/abstract
Index