English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We create a catalogue of simulated fossil groups and study their properties,in particular the merging histories of their first-ranked galaxies. We comparethe simulated fossil group properties with those of both simulated non-fossiland observed fossil groups. Using simulations and a mock galaxy catalogue, wesearched for massive ($>$ 5 $\times$ 10$^{13} h^{-1} {\cal M}_\odot$) fossilgroups in the Millennium Simulation Galaxy Catalogue. In addition, attempted toidentify observed fossil groups in the Sloan Digital Sky Survey Data Release 6using identical selection criteria. Our predictions on the basis of thesimulation data are:(a) fossil groups comprise about 5.5% of the totalpopulation of groups/clusters with masses larger than 5 x 10$^{13} h^{-1} {\calM}_\odot$. This fraction is consistent with the fraction of fossil groupsidentified in the SDSS, after all observational biases have been taken intoaccount; (b) about 88% of the dominant central objects in fossil groups areelliptical galaxies that have a median R-band absolute magnitude of $\sim-23.5-5 log h$, which is typical of the observed fossil groups known in theliterature; (c)first-ranked galaxies of systems with $ {\cal M} >$ 5 x 10$^{13}h^{-1} {\cal M}_\odot$, regardless of whether they are either fossil ornon-fossil, are mainly formed by gas-poor mergers; (d) although fossil groups,in general, assembled most of their virial masses at higher redshifts incomparison with non-fossil groups, first-ranked galaxies in fossil groupsmerged later, i.e. at lower redshifts, compared with their non-fossil-groupcounterparts. We therefore expect to observe a number of luminous galaxies inthe centres of fossil groups that show signs of a recent major merger.

Fossil Groups in the Millennium Simulation. Evolution of the Brightest Galaxies