2006PASJ...58..103B

begin{HTML} We combined spatially resolved Chandra data with the ROSAT data to constrain the dark-matter distribution in the galaxy group NGC 5044. Within 250 h^-1₅₀kpc, the total mass is found to be ∼ 1.6 x 10¹³ M_☉, 12% of which constitutes baryonic mass. Within the inner central regions, the total mass profile exhibits a double structure, typical for groups containing a cD galaxy. Following previous studies of mostly rich galaxy clusters, we studied in detail the nature of such a double structure, whereby we inferred likely interface between the cD galaxy and the surrounding galaxies. For this interesting group, we determined for the first time the galaxy-group interface, which is around 7.5kpc from the peak of the X-ray emission. The total mass internal to this interface radius is found to be ∼ 7.1 x 10¹⁰ M_☉. Beyond this radius, the total mass profile becomes DM-dominated and the corresponding DM profile is reasonably fitted with the NFW model, yielding results consistent with the observed scatter expected for CDM halos. A power-law fit to the DM mass profile gives a = 1.88 ± 0.32, a slope that is within the observed range, but is significantly larger than that of low surface brightness galaxies and self-interacting DM halos.