TY - JOUR
AU - Ishizaki, Wataru
AB - Pulsar wind nebulae (PWNe) are one of the most energetic galactic sources with bright emissions from radio waves to very high-energy gamma-rays. We perform wideband X-ray spectroscopy of four energetic PWNe, N 157 B, PSR J1813−1749, PSR J1400−6325, and G21.5−0.9, with the Suzaku, Chandra, NuSTAR, and Hitomi observatories. A significant spectral break or cut-off feature is found in the hard X-ray band for all the samples, except for N 157 B. The break energies in the broken power-law fitting are in the range of 4–14 keV, whereas the cut-off energies in the cut-off power-law fitting are at 22 keV or higher. The break or cut-off energy does not show a significant correlation with either the spin-down energy or characteristic age of the hosting pulsars. A possible correlation is found between the photon index change in the broken power-law fitting and the X-ray emitting efficiency of the pulsars, although its significance is not high enough to be conclusive. We discuss what determines the break parameters based on simple models.
TI - Spectral break of energetic pulsar wind nebulae detected with wideband X-ray observations
JF - Publications of the Astronomical Society of Japan
DO - 10.1093/pasj/psac062
DA - 2022-08-13
UR - https://www.deepdyve.com/lp/oxford-university-press/spectral-break-of-energetic-pulsar-wind-nebulae-detected-with-wideband-uWVoGJikAE
SP - 1186
EP - 1197
VL - 74
IS - 5
DP - DeepDyve
ER -