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Suzaku Detection of Diffuse Hard X-Ray Emission outside Vela X

By Satoru Katsuda, Koji Mori, Robert Petre, Hiroya Yamaguchi, Hiroshi Tsunemi, Fabrizio Bocchino, Aya Bamba, Marco Miceli, John W. Hewitt, Tea Temim, Hiroyuki Uchida and Rie Yoshii

Abstract

Vela X is a large, 3x2 degrees, radio-emitting pulsar wind nebula (PWN) powered by the Vela pulsar in the Vela supernova remnant. Using four Suzaku/XIS observations pointed just outside Vela X, we find hard X-ray emission extending throughout the fields of view. The hard X-ray spectra are well represented by a power-law. The photon index is measured to be constant at Gamma~2.4, similar to that of the southern outer part of Vela X. The power-law flux decreases with increasing distance from the pulsar. These properties lead us to propose that the hard X-ray emission is associated with the Vela PWN. The larger X-ray extension found in this work strongly suggests that distinct populations relativistic electrons form the X-ray PWN and Vela X, as was recently inferred from multiwavelength spectral modeling of Vela X.Comment: 18 pages, 7 figures, accepted for publication in PASJ (Suzaku Special Issue

Topics: Astrophysics - High Energy Astrophysical Phenomena
Year: 2011
DOI identifier: 10.1093/pasj/63.sp3.S827
OAI identifier: oai:arXiv.org:1103.4872
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