2009•UvA-DARE (University of Amsterdam)Requires access
Discovery of burst oscillations near the spin frequency in the intermittent accreting millisecond pulsar HETE J1900.1-2455
Anna L. Watts, D. Altamirano, P. Casella, Y. Cavecchi, Nathalie Degenaar, M. Linares, Alessandro Patruno, N. Rea, Paolo Soleri, Michiel van der Klis, Rudy A. D. Wijnands
Open publisher page 1 citations
Abstract
RXTE observations of the intermittent accreting millisecond X-ray pulsar HETE J1900.1-2455 (Kaaret et al. 2006 ApJ 638, 963; Galloway et al. 2007 ApJ 654, L73) showed a Type I X-ray burst on April 2 2009 (08:57 UTC). We detect strong burst oscillations during the peak and initial decay of the burst, drifting upwards from 375.5 Hz to 376.5 Hz. Maximum Leahy power is in the range 25-45 in 4 independent consecutive 2s bins (using all photons in the 2-60 keV band), putting the detection beyond doubt.