Kavli Affiliate: Nicola Omodei
| First 5 Authors: Niccolò Bucciantini, Riccardo Ferrazzoli, Matteo Bachetti, John Rankin, Niccolò Di Lalla
| Summary:
The Crab pulsar and its nebula are among the most studied astrophysical
systems, and constitute one of the most promising environments where high
energy processes and particle acceleration can be investigated. They are the
only objects for which previous X-ray polarisation has been reported. We
present here the first Imaging X-ray Polarimetry Explorer (IXPE) observation of
the Crab pulsar and nebula. The total pulsar pulsed emission in the [2-8] keV
energy range is unpolarised. Significant polarisation up to 15% is detected
only in the core of the main peak. The nebula has a total space integrated
polarised degree of 20% and polarisation angle of 145deg. The polarised maps
show a large level of asymmetry, and regions with polarised degree up to
45-50%. The polarisation pattern suggests a predominantly toroidal magnetic
field.
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