Confirmation of a Thousand Solar Mass Black Hole in a Low-Mass Galaxy

We are currently in an exciting era where large populations of 1e41e6 Msunintermediate black holes are being recovered in the nuclei of lowmass galaxies,which are informing our understanding on the growth of supermassive black holes. However, we still lack observational constraints on possible nuclear blackholes in the virgul1000 Msun range, save for a handful of candidates. We identifieda 30004000 Msun intermediate mass black hole candidate from a Chandraobservation of a latetype spiral galaxy, on account of a soft and luminous(nearEddington) Xray spectrum. Here, we propose an EPIC XMMNewton spectrum(with nearly 20 times more counts) to confirm/refute our current intermediatemass black hole interpretation. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]