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Kirsch, M. G. F.; Schönherr, G.; Kendziorra, E.; Freyberg, M. J.; Martin, M.; Wilms, J.; Mukerjee, K.; Breitfellner, M. G.; Smith, M. J. S.; Staubert, R. (2006)
Publisher: EDP Sciences
Languages: English
Types: Article
Subjects: QB

Classified by OpenAIRE into

arxiv: Astrophysics::High Energy Astrophysical Phenomena
Aims. We discuss the current X-ray view of the Crab Nebula and Pulsar, summarising our analysis of observations of the source with the EPIC-pn camera on board the XMM-Newton observatory. Different modes of EPIC-pn were combined in order to yield a complete scenario of the spectral properties of the Crab resolved in space and time (pulse phase). In addition we give a description of the special\ud EPIC-pn Burst mode and guidance for data reduction in that mode.\ud Methods. We analysed spectra for the nebula and pulsar separately in the 0.6−12.0 keV energy band. All data were processed with the\ud SAS 6.0.0 XMM-Newton Scientific Analysis System package; models were fitted to the data with XSPEC 11. The high time resolution of EPIC-pn in its Burst mode (7 μs) was used for a phase resolved analysis of the pulsar spectrum, after determination of the period with epoch folding techniques. Data from the SmallWindow mode were processed and corrected for pile-up allowing for spectroscopy\ud simultaneously resolved in space and time.\ud Results. The spatial variation of the spectrum over the entire region of the Crab shows a gradual spectral softening from the inner pulsar region to the outer nebula region with a variation in photon index, Γ, from 2.0 to 2.4. Pulse phase resolved spectroscopy of the Crab Pulsar reveals a phase dependent modulation of the photon index in form of a significant hardening of the spectrum in the\ud inter-peak phase from Γ = 1.7 during the pulse peak to Γ = 1.5.
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