[Okc-wp4] EO meeting: 24th of March

[Davide Gizzi]

Dear all,


our next Extreme Object meeting will be next Thursday, 24th of March, at 13:15 (CET). The speaker is Mózsi Kiss from KTH, talking about the XL-Calibur balloon-borne polarimeter. See below for title and abstract of the talk.

To join the meeting:
https://stockholmuniversity.zoom.us/j/65883589027?pwd=RGxJOUVQWmNtMlZFMUIwaHRabkExdz09

Meeting ID: 658 8358 9027



Title:
"T - 7 weeks for the XL-Calibur balloon-borne hard X-ray polarimeter"

Abstract:
"XL-Calibur is a balloon-borne polarimeter for hard X-rays in the range ~10-80 keV. It is currently scheduled to be launched on a stratospheric balloon from the Esrange Space Center in northern Sweden, for a week-long flight to Canada. The system features an X-ray mirror with a 12 m focal length and a Compton polarimeter with a beryllium scattering element surrounded by pixelated CZT detectors. The giant truss is pointed and stabilized using the Wallops Arc-Second Pointer (WASP), allowing astronomical sources to be acquired and tracked. The main observational targets are the Crab system (pulsar, nebula) and Cygnus X-1, and observations will provide new insights into the emission mechanisms of these sources. Joint observations are planned with other missions such as the recently launched IXPE, AstroSat and NICER. KTH is responsible for the anticoincidence shield surrounding the polarimeter. In this talk, I will present the scientific instrument and our frantic preparations that will hopefully culminate in a launch in mid-May. I will also describe our two main sources and what we hope to learn about them through these observations."

Hope to see you there!

Ana Sagués Carracedo & Davide Gizzi
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