A hard X-ray power-law spectral cutoff in centaurus X-4

Deepto Chakrabarty, John A. Tomsick, Brian W. Grefenstette, Dimitrios Psaltis, Matteo Bachetti, Didier Barret, Steven E. Boggs, Finn E. Christensen, William W. Craig, Felix Fürst, Charles J. Hailey, Fiona A. Harrison, Victoria M. Kaspi, Jon M. Miller, Michael A. Nowak, Vikram Rana, Daniel Stern, Daniel R. Wik, Jörn Wilms, William W. Zhang