Detection of the tip of the red giant branch in NGC 5128

Roberto Soria, Jeremy R. Mould, Alan M. Watson, John S. Gallagher, Gilda E. Ballester, Christopher J. Burrows, John T. Clarke, David Crisp, Richard E. Griffiths, J. Jeff Hester, John G. Hoessel, Jon A. Holtzman, Paul A. Scowen, Karl R. Stapelfeldt, John T. Trauger, James A. Westphal