Applicability of improved halo-centre tracers to galaxy groups

Determine whether improved instrumentation enables the intracluster-light-based tracer of the dark-matter halo centre to be applied accurately to galaxy groups.

Background

The paper shows that the BHG offset from the potential minimum is a more effective relaxation indicator than the offset from the luminosity centre, while noting that the true potential minimum is difficult to determine observationally. It discusses the intracluster light (ICL) as a possible tracer because it may follow the gravitational potential more closely than satellite galaxies.

The unresolved issue is whether upcoming survey data and improved instrumentation can make this approach sufficiently accurate beyond massive clusters, particularly for galaxy groups where X-ray measurements are less effective or unavailable.