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24 April 2024 |
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Magnetar Broadband X-ray Spectra Correlated with Magnetic Fields: Suzaku Archive of SGRs and AXPs Combined with NuSTAR, Swift, and RXTE | | Teruaki Enoto
; Shinpei Shibata
; Takao Kitaguchi
; Yudai Suwa
; Takahiko Uchide
; Hiroyuki Nishioka
; Shota Kisaka
; Toshio Nakano
; Hiroaki Murakami
; Kazuo Makishima
; | | Date: |
24 Apr 2017 | | Abstract: | Studies were made of the 1-70 keV persistent spectra of fifteen magnetars as
a complete sample observed with Suzaku from 2006 to 2013. Combined with early
NuSTAR observations of four hard X-ray emitters, nine objects showed a hard
power-law emission dominating at $gtrsim$10 keV with the 15--60 keV flux of
$sim$1-$11 imes 10^{-11}$ ergs s$^{-1}$ cm$^{-2}$. The hard X-ray luminosity
$L_{
m h}$, relative to that of a soft-thermal surface radiation $L_{
m s}$,
tends to become higher toward younger and strongly magnetized objects. Updated
from the previous study, their hardness ratio, defined as $xi=L_{
m h}/L_{
m
s}$, is correlated with the measured spin-down rate $dot{P}$ as $xi=0.62
imes (dot{P}/10^{-11},{
m s},{
m s}^{-1})^{0.72}$, corresponding with
positive and negative correlations of the dipole field strength $B_{
m d}$
($xi propto B_{
m d}^{1.41}$) and the characteristic age $ au_{
m c}$
($xi propto au_{
m c}^{-0.68}$), respectively. Among our sample, five
transients were observed during X-ray outbursts, and the results are compared
with their long-term 1-10 keV flux decays monitored with Swift/XRT and
RXTE/PCA. Fading curves of three bright outbursts are approximated by an
empirical formula used in the seismology, showing a $sim$10-40 d plateau
phase. Transients show the maximum luminosities of $L_{
m s}$$sim$$10^{35}$
erg s$^{-1}$, which is comparable to those of the persistently bright ones, and
fade back to $lesssim$$10^{32}$ erg s$^{-1}$. Spectral properties are
discussed in a framework of the magnetar hypothesis. | | Source: | arXiv, 1704.7018 | | Services: | Forum | Review | PDF | Favorites | |
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