Roberts, T. P.; Fabbiano, G.; Luo, B.; Kim, D. -W; Strader, J.; Middleton, M. J.; Brodie, J. P.; Fragos, T.; Gallagher, J. S.; Kalogera, V.; King, A. R.; Zezas, Andreas
(2012)
We report the discovery of a new ultraluminous X-ray source associated with a globular cluster in the elliptical galaxy NGC 4649. The X-ray source was initially detected with a luminosity below 5 × 10<SUP>38</SUP> erg ...