The extended hard X - ray emission from the Vela Plerion
نویسندگان
چکیده
We present the results of a broad band (3-200 keV) spectral analysis of BeppoSAX and XMM-Newton observations of the Vela plerion. The hard X-ray (>15 keV) emission is found to be extended over a region of 12 ′ − 15 ′ radius, corresponding to a size of about 1.0–1.3 pc for a source distance of 290 pc. A single power law does not give an acceptable fit while a broken power law or a log-parabolic law nicely fit the data. The former spectral model has the photon index Γ1 = 1.66±0.01 for energies lower than the break value equal to 12.5 keV and the index Γ2 = 2.01±0.05 up to about 200 keV. The total X-ray luminosity of the Vela plerion is LX = 5.5 × 10 33 erg s −1 , which implies a conversion factor of the spin–down power of ∼10 −3 .
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