Data Centre for Astrophysics
Astronomy Department of the University of Geneva
ISDC Seminar

Tuesday, 14 August 2018 at 14:00

Hiromitsu Takahashi
Hiroshima University

Hard X-ray polarization observations of Crab and Cygnus X-1 by PoGO+

Abstract. PoGO+ is a balloon-borne hard X-ray Compton polarimetry telescope operating in the energy range of 20–180 keV. The instrument is optimized for point-sources and has a field of view collimated to 2∘. During 1-week flight in 2016 from Kiruna, Sweden to Victoria island, Canada, PoGO+ managed to observe Crab and Cygnus X-1. The polarization fractions are measured as (20.9+-5.0)% for Crab, and the 90% upper limit of <8.6% for Cygnus X-1. I will introduce the PoGO+ detector performance and explain the polarization results.

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