タナカ　シュウタ   TANAKA Shuta   田中　周太    所属   青山学院大学  理工学部 物理科学科    職種   助教
発行・発表の年月	2022/08
形態種別	学術雑誌
標題	Spectral break of energetic pulsar wind nebulae detected with wideband X-ray observations
執筆形態	共同
掲載誌名	Publications of the Astronomical Society of Japan
掲載区分	国外
出版社・発行元	Oxford University Press (OUP)
巻・号・頁	74(5),1186-1197頁
著者・共著者	Aya Bamba, Shinpei Shibata, Shuta J Tanaka, Koji Mori, Hiroyuki Uchida, Yukikatsu Terada, Wataru Ishizaki
概要	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.
DOI	10.1093/pasj/psac062
ISSN	00046264
NAID	1360861707123150976