Abstract
Vela X powered by the Vela pulsar is the best example of an evolved pulsar wind nebula, allowing to access the particle injection history and the interaction with the supernova ejecta. We present the spectrum of Vela X in the 20–300 keV energy range as measured by IBIS/ISGRI and SPI, the main instruments onboard the INTEGRAL satellite. The apparent discrepancy between IBIS/ISGRI, SPI, and previousmeasurements is understood in terms of point spread function, pointing out a nebula more diffuse than previously thought. The presence of cooled electrons is also revealed by the spectral break measured including Suzaku data in the 1–10 keV range. This picture is supported by the identification of a new structure in the 20–60 keV energy band extended along the NE/SW axis and partially coincident with the cocoon, the soft X-ray filament extending towards the centre of the remnant.
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