DOES THE HOLMBERG II ULX HARBOUR AN INTERMEDIATE MASS BLACK HOLEquestionMark

We propose a 100ksec XMM/EPIC observation of one of the brightest nearby ULX,which resides in the galaxy Holmberg II (UGC 4305). This observation will allowus to measure the shape of the fluctuation power density spectrum (PDS) for thissource. Comparison of the measured PDS shape and breakfrequency with thoseobtained from stellarmass galactic black hole binary systems and AGN, willallow us to determine unambiguously whether this ULX is simply a high luminosityextragalactic analogue of galactic black hole binary systems, but withanisotropic Xray emission, or more intriguingly the first known representativeof the socalled missing class.. of intermediatemass black holes, with a massin the range 100 10000 solar masses. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]