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Oxford University Press, Publications of Astronomical Society of Japan, sp3(63), p. S827-S836, 2011

DOI: 10.1093/pasj/63.sp3.s827

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

Journal article published in 2011 by Satoru Katsuda, Koji Mori, Robert Petre, Hiroya Yamaguchi, Hiroshi Tsunemi, Fabrizio Bocchino, Aya Bamba, Marco Miceli, John W. Hewitt, Tea Temim ORCID, Hiroyuki Uchida, Rie Yoshii
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Vela X is a large, 3ı 2ı, 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 have found 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 was measured to be constant at Γ 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 of relativistic electrons form the X-ray PWN and Vela X, as was recently inferred from multiwavelength spectral modeling of Vela X.