A Transient outburst of a low-mass X-ray pulsar in an ultracompact binary
NICER Discovery of Millisecond X-ray Pulsations and an Ultracompact Orbit in IGR J17494-3030
The fractional rms pulsed amplitude is 7.4%, and the soft (1-3 kev) pulse profile contains a significant second harmonic.
We also recovered the x-raypulsations in archival 2012 xmm-newton observations, allowing us to measure a long-term pulsar spin-down rate of hz/s and to infer a pulsar surface dipole magnetic field strength of g. we show that the mass transfer in the binary is likely non-conservative, and wediscuss various scenarios for mass loss from the system.
Mason Ng, Paul S. Ray, Peter Bult, Deepto Chakrabarty, Gaurava K. Jaisawal, Christian Malacaria, Diego Altamirano, Zaven Arzoumanian, Keith C. Gendreau, Tolga Güver, Matthew Kerr, Tod E. Strohmayer, Zorawar Wadiasingh, Michael T. Wolff