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Compact groups are associations of a few galaxies in which the environmentplays an important role in galaxy evolution. The low group velocity dispersionfavors tidal interactions and mergers, which may bring stars from galaxies tothe diffuse intragroup light. Numerical simulations of galaxy clusters inhierarchical cosmologies show that the amount of the diffuse light increaseswith the dynamical evolution of the cluster. We search for diffuse light in thegalaxy group HCG 44 in order to determine its luminosity and luminosityfraction. Combining with literature data, we aim to constrain the dynamicalstatus of Hickson compact groups. We use Intra Group planetary nebulae (IGPNe)as tracers of diffuse light. These are detected by the so-called on band-offband technique. We found 12 emission line objects in HCG 44, none of themassociated with the galaxies of the group. 6/12 emission line objects areconsistent with being IGPNe in HCG 44, but are also consistent with beingLy$\alpha$ background galaxies. Thus we derive an upper limit to the diffuselight fraction in HCG 44 of 4.7%. We find a correlation between the fraction ofelliptical galaxies and the amount of diffuse light in Hickson compact groups.Those with large fraction of diffuse light are those with large fractions innumber and luminosity of E/S0 galaxies. We propose an evolutionary sequence forHickson compact groups in which the amount of diffuse light increases with thedynamical evolution of the group.Comment: 9 pages, 4 figures, accepted for publication at A&

Diffuse light in Hickson compact groups: the dynamically young system HCG 44