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Tokyo), Aya Bamba (5), Junko S Hiraga (6) ((1) Titech, Masaharu Izawa (1, Masanobu Ozaki (2), Tadayasu Dotani (2, Takahisa Fujinaga (4)","submitted_at":"2015-02-13T06:05:11Z","abstract_excerpt":"A largely extended X-ray emission was discovered around the pulsar PSR J1357-6429 with the Suzaku deep observations. The pulsar, whose characteristic age is 7.3 kyr, is located within the TeV gamma-ray source HESS J1356-645. The extended emission is found to have a 1sigma X-ray size of ~4 arcmin, or ~3 pc at 2.4 kpc, with a small offset from the pulsar. Its X-ray spectrum is well reproduced by a simple power-law model with a photon index of 1.70+0.07-0.06. No significant spatial variation was found for the X-ray photon index as a function of distance from the pulsar. 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