Chandra observation of the globular cluster NGC 6440 and the nature of cluster X-ray luminosity functions

Pooley, D.; Lewin, W.H.G.; Verbunt, F.W.M.; Homer, L.; Margon, B.; Gaensler, B.W.; Kaspi, V.M.; Miller, J.M.; Fox, D.E.; van der Klis, M.