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The Crab pulsar and its nebula are among the most studied astrophysicalsystems, and constitute one of the most promising environments where highenergy processes and particle acceleration can be investigated. They are theonly objects for which previous X-ray polarisation has been reported. Wepresent here the first Imaging X-ray Polarimetry Explorer (IXPE) observation ofthe Crab pulsar and nebula. The total pulsar pulsed emission in the [2-8] keVenergy range is unpolarised. Significant polarisation up to 15% is detectedonly in the core of the main peak. The nebula has a total space integratedpolarised degree of 20% and polarisation angle of 145deg. The polarised mapsshow a large variation in the local polarisation, and regions with polariseddegree up to 45-50%. The polarisation pattern suggests a predominantly toroidalmagnetic field.

Simultaneous space and phase resolved X-ray polarimetry of the Crab Pulsar and Nebula