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Detection of polarized gamma-ray emission from the Crab nebula with the Hitomi Soft Gamma-ray Detector
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Number of Authors: 1932018 (English)In: Publications of the Astronomical Society of Japan, ISSN 0004-6264, E-ISSN 2053-051X, Vol. 70, no 6, article id psy113Article in journal (Refereed) Published
Abstract [en]

We present the results from the Hitomi Soft Gamma-ray Detector (SGD) observation of the Crab nebula. The main part of SGD is a Compton camera, which in addition to being a spectrometer, is capable of measuring polarization of gamma-ray photons. The Crab nebula is one of the brightest X-ray / gamma-ray sources on the sky, and, the only source from which polarized X-ray photons have been detected. SGD observed the Crab nebula during the initial test observation phase of Hitomi. We performed the data analysis of the SGD observation, the SGD background estimation and the SGD Monte Carlo simulations, and, successfully detected polarized gamma-ray emission from the Crab nebula with only about 5 ks exposure time. The obtained polarization fraction of the phase-integrated Crab emission (sum of pulsar and nebula emissions) is (22.1% +/- 10.6%), and, the polarization angle is 110.degrees 7 + 13.degrees 2 /-13.degrees 0 in the energy range of 60-160 keV (The errors correspond to the 1 sigma deviation). The confidence level of the polarization detection was 99.3%. The polarization angle measured by SGD is about one sigma deviation with the projected spin axis of the pulsar, 124.degrees 0 +/- 0.degrees 1.

Place, publisher, year, edition, pages
2018. Vol. 70, no 6, article id psy113
Keywords [en]
instrumentation: polarimeters, polarization, X-rays: individual (Crab)
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-165761DOI: 10.1093/pasj/psy118ISI: 000456072300015OAI: oai:DiVA.org:su-165761DiVA, id: diva2:1285475
Available from: 2019-02-04 Created: 2019-02-04 Last updated: 2019-02-04Bibliographically approved

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Axelsson, Magnus
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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