The estimated angular extent, measured from the NGC 1399 centre and up to a limiting radius where the areal density of blue globular clusters falls to 30 per cent of the background level, is 45±5 arcmin, which corresponds to 220–275 kpc at the Fornax distance.

The best-fit orbital model suggests a ratio of the tangential to radial internal velocity dispersions of 3.

This ratio is the largest seen in any galaxy to date and will provide an important measure for the mode by which the central black hole has grown.

The data collected with Herschel showed that, contrary to previous belief, most of these galaxies contain plenty of cold gas – the raw material to form stars – with the exception of NGC 1399 and one other.

For most of the galaxies observed, the activity of the black hole seems to have put an end to star formation but has not yet succeeded in clearing them of all their cold gas, but in the case of NGC 1399 the feedback cycle appears to be at a more advanced stage, as the jets have hardly left any trace of cold gas.

Evidence from Chandra suggests that a white dwarf star has been torn apart by an intermediate-mass black hole, but this is only a proposal, and its true nature remains a mystery.

A 2019 study of globular cluster ULXs in NGC 1399 [8] has since disproven this proposal, as the source has remained X-ray bright far longer than is theoretically possible in the intermediate-mass black hole disrupting a white dwarf scenario.