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Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045 | | Hongjun An
; Robert F. Archibald
; Romain Hascoet
; Anne M. Archibald
; Andy Beardmore
; Steven E. Boggs
; Finn E. Christensen
; William W. Craig
; Niel Gehrels
; Charles J. Hailey
; Fiona A. Harrison
; Jamie Kennea
; Chryssa Kouveliotou
; Daniel Stern
; George Younes
; William W. Zhang
; | | Date: |
14 May 2015 | | Abstract: | We report on a 350-ks NuSTAR observation of the magnetar 1E 1841-045 taken in
2013 September. During the observation, NuSTAR detected six bursts of short
duration, with $T_{90}<1$ s. An elevated level of emission tail is detected
after the brightest burst, persisting for $sim$1 ks. The emission showed a
power-law decay with a temporal index of 0.5 before returning to the persistent
emission level. The long observation also provided detailed phase-resolved
spectra of the persistent X-ray emission of the source. By comparing the
persistent spectrum with that previously reported, we find that the source
hard-band emission has been stable over approximately 10 years. The persistent
hard X-ray emission is well fitted by a coronal outflow model, where $e^{+/-}$
pairs in the magnetosphere upscatter thermal X-rays. Our fit of phase-resolved
spectra allowed us to estimate the angle between the rotational and magnetic
dipole axes of the magnetar, $alpha_{mag}=0.25$, the twisted magnetic flux,
$2.5 imes10^{26}
m G cm^2$, and the power released in the twisted
magnetosphere, $L_j=6 imes10^{36}
m erg s^{-1}$. Assuming this model for
the hard X-ray spectrum, the soft X-ray component is well fit by a
two-blackbody model, with the hotter blackbody consistent with the footprint of
the twisted magnetic field lines on the star. We also report on the 3-year
Swift monitoring observations obtained since 2011 July. The soft X-ray spectrum
remained stable during this period, and the timing behavior was noisy, with
large timing residuals. | | Source: | arXiv, 1505.3570 | | Services: | Forum | Review | PDF | Favorites | |
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