[Okc-wp4] EO seminar on the 22nd of May

[Haakon Andresen]

Dear Everyone,

Mark Pearce will present recent XL-Calibur results in week's EO seminar, I highly
recommend the seminar to all crab, x-ray, and balloon enthusiasts.

Where: A5:1003
When: Thursday 22nd of May at 13:15

Best,
Haakon (on behalf of the organisers)

Speaker: Mark Pearce

Hard X-ray polarimetry of the Crab with XL-Calibur
In summer 2024, the linear polarisation of hard X-ray emission from the Crab pulsar and wind nebula was measured by XL-Calibur. Observations were made during a week-long stratospheric balloon flight between Sweden and Canada. The addition of polarimetry to the standard high-energy measurement techniques of spectroscopy, timing and imaging, allows systematically new tests of source emission models. XL-Calibur is the most sensitive hard X-ray polarimetry mission to date, offering an order-of-magnitude improvement in signal-to-background performance compared to preceding missions. The energy range (15-80 keV) complements the NASA/ASI IXPE mission (2-8 keV), allowing broadband studies. I will introduce the XL-Calibur mission, explain how the linear polarisation of hard X-rays is measured, and summarise results from Crab observations. Plans for further hard X-ray polarimetry missions will be briefly described.

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