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Hard X-ray and Soft Gamma Ray Polarimetry with CdTe/CZT Spectro-Imager

INAF/OAS di Bologna, I-40129 Bologna, Italy
LIP-Coimbra, Departamento de Física da Universidade de Coimbra, Rua Larga, P-3004-516 Coimbra, Portugal
INAF/IASF-Palermo, I-90146 Palermo, Italy
Departamento de Física, University of Beira-Interior, P-6201-001 Covilhã, Portugal
Author to whom correspondence should be addressed.
Galaxies 2018, 6(3), 69;
Received: 26 May 2018 / Revised: 2 July 2018 / Accepted: 2 July 2018 / Published: 8 July 2018
(This article belongs to the Special Issue The Bright Future of Astronomical X-ray Polarimetry)
PDF [5052 KB, uploaded 8 July 2018]


CdTe/CZT based spectroscopic two-dimensional (2D)/three-dimensional (3D) imagers when operated in the Compton regime can work as high performance scattering polarimeters, for high-energy astrophysics. Polarimetry in high-energy astrophysics has been little explored. To date, X- and γ-ray source emissions have been studied almost exclusively through spectral, imaging, and timing analysis. Polarization measurements provide two additional observational parameters: the polarization angle and the level of linear polarization. These additional parameters should allow for a better discrimination between the physical mechanisms of different emission models characterizing a celestial object. Therefore, polarimetry will play a strategic role in new instrumentations for future high-energy astronomy missions. 2D and 3D CZT/CdTe spectroscopic imagers provided with coincidence readout logic can efficiently handle scattering events to perform simultaneously polarization, spectroscopy, imaging, and timing measurements. Herein, we describe the results obtained, both experimentally and by MC simulations, with CdTe/CZT pixel detector prototypes in high-energy polarimetry. We give an overview on the achievable polarimetric performance with spectroscopic imagers and on how these performances are affected by detector configuration parameters. Finally, we address the perspective of scattering polarimetry opened by the recent implementation of new high energy focusing optics, as broadband Laue lens, in next generation of hard X- and soft γ-ray astronomy instrumentation. The unprecedented sensitivity achievable by these telescopes will definitely open the window of polarimetry in this high-energy range. View Full-Text
Keywords: scattering polarimetry; CdTe/CZT spectrometers; pixel detectors; X- and γ-rays astrophysics scattering polarimetry; CdTe/CZT spectrometers; pixel detectors; X- and γ-rays astrophysics

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Caroli, E.; Moita, M.; Da Silva, R.M.C.; Del Sordo, S.; De Cesare, G.; Maia, J.M.; Pàscoa, M. Hard X-ray and Soft Gamma Ray Polarimetry with CdTe/CZT Spectro-Imager. Galaxies 2018, 6, 69.

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