Description
Recent strong lensing analyses have suggested that the dark matter subhalo detected in SDSSJ0946+1006 has an extremely high concentration, which is difficult to reconcile with predictions from the standard cold dark matter (CDM) model. However, previous studies did not properly account for the possible contribution of light from a galaxy embedded within the subhalo, if such a galaxy exists. Using a more advanced model that fully incorporates the satellite galaxy’s light, we constrain the subhalo’s mass profile and find it to be fully consistent with CDM predictions. This also represents the first strong lensing-based measurement of a dwarf satellite's light and mass, marking a significant step forward in the study of dwarf satellites at cosmological distances.
