High Resolution X-ray Observations of the Pulsar Wind Nebula Associated with the Gamma-ray Source HESSJ1640-465

Abstract

We present a Chandra X-ray observation of the very high energy $\gamma$-ray source HESSJ1640-465. We identify a point source surrounded by a diffuse emission that fills the extended object previously detected by XMM Newton at the centroid of the HESS source, within the shell of the radio supernova remnant (SNR) G338.3-0.0. The morphology of the diffuse emission strongly resembles that of a pulsar wind nebula (PWN) and extends asymmetrically to the South-West of a point-source presented as a potential pulsar. The spectrum of the putative pulsar and compact nebula are well-characterized by an absorbed power-law model which, for a reasonable $N_{\mathrm{H}}$ value of $14\times 10^{22}\mathrm{c}{\mathrm{m}}^{-2}$, exhibit an index of 1.1 and 2.5 respectively, typical of Vela-like PWNe. We demonstrate that, given the HI absorption features observed along the line of sight, the SNR and the HII surrounding region are probably connected and lie between 8 kpc and 13 kpc. The resulting age of the system is between 10 and 30 kyr. For a 10 kpc distance (also consistent with the X-ray absorption) the 2-10 keV X-ray luminosities of the putative pulsar and nebula are $L_{\mathrm{PSR}}\sim 1.3\times 10^{33}{d}_{10\mathrm{kpc}}^{2}erg.{\mathrm{s}}^{-1}$ and $L_{\mathrm{PWN}}\sim 3.9\times 10^{33}{d}_{10}^{2}erg.{\mathrm{s}}^{-1}$ ($d_{10}=d/10\mathrm{kpc}$). Both the flux ratio of $L_{\mathrm{PWN}}/L_{\mathrm{PSR}}\sim 3.4$ and the total luminosity of this system predict a pulsar spin-down power around $\dot{E}\sim 4\times 10^{36}\mathrm{erg}{\mathrm{s}}^{-1}$. We finally consider several reasons for the asymmetries observed in the PWN morphology and discuss the potential association with the HESS source in term of a time-dependent one-zone leptonic model.

35 pages, 9 figures

References in corpus (3)

• Energy dependent gamma-ray morphology in the Pulsar wind nebula HESSJ1825-137
• XMM-Newton observations reveal the X-ray counterpart of the very-high-energy gamma-ray source HESSJ1640-465
• Swift/XRT follow-up observations of TeV sources of the HESS Inner Galaxy survey

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