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arXiv · 1405.0465

NuSTAR Discovery of a Young, Energetic Pulsar Associated with the Luminous Gamma-ray Source HESS J1640-465

E. V. Gotthelf·J. A. Tomsick·J. P. Halpern·J. D. Gelfand·F. A. Harrison·S. E. Boggs·F. E. Christensen·W. W. Craig·J. C. Hailey·V. M. Kaspi·D. K. Stern·W. W. Zhang
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Abstract

We report the discovery of a 206 ms pulsar associated with the TeV gamma-ray source HESS J1640-465 using the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray observatory. PSR J1640-4631 lies within the shell-type supernova remnant (SNR) G338.3-0.0, and coincides with an X-ray point source and putative pulsar wind nebula (PWN) previously identified in XMM-Newton and Chandra images. It is spinning down rapidly with period derivative Pdot = 9.758(44)E-13, yielding a spin-down luminosity Edot = 4.4E36 erg s-1, characteristic age = P/2Pdot = 3350 yr, and surface dipole magnetic field strength Bs = 1.4E13 G. For the measured distance of 12 kpc to G338.3-0.0, the 0.2 - 10 TeV luminosity of HESS J1640-465 is 6% of the pulsar's present Edot. The Fermi source 1FHL J1640.5-4634 is marginally coincident with PSR J1640-4631, but we find no gamma-ray pulsations in a search using 5 years of Fermi Large Area Telescope (LAT) data. The pulsar energetics support an evolutionary PWN model for the broad-band spectrum of HESS J1640-465, provided that the pulsar's braking index is approximately 2, and that its initial spin period was Po ~ 15 ms.

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E. V. Gotthelf, J. A. Tomsick, J. P. Halpern, J. D. Gelfand, F. A. Harrison, S. E. Boggs, F. E. Christensen, W. W. Craig, J. C. Hailey, V. M. Kaspi, D. K. Stern, W. W. Zhang. 2014-05-02. NuSTAR Discovery of a Young, Energetic Pulsar Associated with the Luminous Gamma-ray Source HESS J1640-465. https://doi.org/10.1088/0004-637x/788/2/155

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