A new eROSITA X-ray upper limit on synchrotron emission from HESS J1646-458 constrains the magnetic field in Westerlund 1 to below about 7 microgauss in a leptonic scenario.
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eROSITA X-ray Analysis of the PeVatron Candidate Westerlund 1
A new eROSITA X-ray upper limit on synchrotron emission from HESS J1646-458 constrains the magnetic field in Westerlund 1 to below about 7 microgauss in a leptonic scenario.