Speaker
Description
"Magnetars are pulsars with extremely strong magnetic fields 10^(14-15) G and thought to be powered by dissipation of their magnetic energies. The mechanism of converting their magnetic energies to the X-ray radiations is still a mystery, so that X-ray observations of magnetars are very important.
We observed one of the famous magnetars SGR 1900+14 with NuSTAR and XMM-Newton simultaneously on 2016 October. In the timing analysis, we found the rotation period on 2016 October was 5.2267(1) s and the period derivative fluctuated more than 50 % in these 20 years. We also discovered the shape of pulse profiles changes at ~10 keV. In the spectral analysis, we determined the hard-tail photon index very precisely, Γ = 1.13(8), and also discovered the photon index varies depending on the rotation phase. Furthermore, we discuss the potentiality of HXMT to target SGR 1900+14, making full use of its broad-band observation up to 250 keV."
