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19 April 2024

» arxiv » 1502.7765

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Broadband X-ray Imaging and Spectroscopy of the Crab Nebula and Pulsar with NuSTAR
Kristin K. Madsen ; Stephen Reynolds ; Fiona Harrison ; Hongjun An ; Steven Boggs ; Finn E. Christensen ; William W. Craig ; Chris L. Fryer ; Brian W. Grefenstette ; Charles J. Hailey ; Craig Markwardt ; Melania Nynka ; Daniel Stern ; Andreas Zoglauer ; William Zhang ;
Date:	26 Feb 2015
Abstract:	We present broadband (3 -- 78 keV) NuSTAR X-ray imaging and spectroscopy of the Crab nebula and pulsar. We show that while the phase-averaged and spatially integrated nebula + pulsar spectrum is a power-law in this energy band, spatially resolved spectroscopy of the nebula finds a break at $sim$9 keV in the spectral photon index of the torus structure with a steepening characterized by $DeltaGammasim0.25$. We also confirm a previously reported steepening in the pulsed spectrum, and quantify it with a broken power-law with break energy at $sim$12 keV and $DeltaGammasim0.27$. We present spectral maps of the inner 100as of the remnant and measure the size of the nebula as a function of energy in seven bands. These results find that the rate of shrinkage with energy of the torus size can be fitted by a power-law with an index of $gamma = 0.094pm 0.018$, consistent with the predictions of Kennel and Coroniti (1984). The change in size is more rapid in the NW direction, coinciding with the counter-jet where we find the index to be a factor of two larger. NuSTAR observed the Crab during the latter part of a $gamma$-ray flare, but found no increase in flux in the 3 - 78 keV energy band.
Source:	arXiv, 1502.7765
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