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• W2517367007 endingPage "4926" @default.
• W2517367007 startingPage "4895" @default.
• W2517367007 abstract "The first wind nebula around a magnetar was recently discovered in X-rays around Swift~J1834.9$-$0846. We study this magnetar's global energetics and the properties of its particle wind or outflows. At a distance of $sim4;$kpc, Swift~J1834.9$-$0846 is located at the center of the supernova remnant (SNR) W41 whose radius is $sim 19;$pc, an order of magnitude larger than that of the X-ray nebula ($sim2;$pc). The association with SNR W41 suggests a common age of $sim5-100;$kyr, while its spin-down age is $4.9$~kyr. A small natal kick velocity may partly explain why a wind nebula was detected around this magnetar but not around other magnetars, most of which appear to have larger kick velocities and may have exited their birth SNR. We find that the GeV and TeV source detected by Fermi/LAT and H.E.S.S., respectively, of radius $sim11;$pc is most likely of hadronic origin. The dynamics and internal structure of the nebula are examined analytically to explain the nebula's current properties. Its size may naturally correspond to the diffusion-dominated cooling length of the X-ray emitting $e^+e^-$ pairs. This may also account for the spectral softening of the X-ray emission from the nebula's inner to outer parts. Analysis of the X-ray synchrotron nebula implies that (i) the nebular magnetic field is $gtrsim 11;mu$G (and likely $lesssim30;mu$G), and (ii) the nebula is not powered predominantly by the magnetar's quiescent spin-down-powered MHD wind, but by other outflows that contribute most of its energy. The latter are most likely associated with the magnetar's bursting activity, and possibly dominated by outflows associated with its past giant flares. The energy source for the required outflows cannot be the decay of the magnetar's dipole field alone, and is most likely the decay of its much stronger internal magnetic field." @default.
• W2517367007 created "2016-09-16" @default.
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• W2517367007 creator A5088268135 @default.
• W2517367007 date "2016-10-08" @default.
• W2517367007 modified "2023-10-16" @default.
• W2517367007 title "Learning about the magnetar Swift J1834.9−0846 from its wind nebula" @default.
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