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Proceedings Paper

The background of the gas pixel detector and its impact on imaging X-ray polarimetry
Author(s): Paolo Soffitta; Riccardo Campana; Enrico Costa; Sergio Fabiani; Fabio Muleri; Alda Rubini; Ronaldo Bellazzini; Alessandro Brez; Massimo Minuti; Michele Pinchera; Gloria Spandre
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Paper Abstract

The background of the Gas Pixel Detector is expected to be negligible for polarimetry of point sources due to the intrinsic low atomic number and density of the He-DME mixtures and to its imaging properties. Also the background for extended sources is expected to be negligible at least down to the smallest flux for sensitive polarimetry in a reasonable observing time. However in the spatial distribution of the background in a laboratory environment we observed an accumulation on the edges of the sensitive plane due to the presence of the nearby cell walls. We recently developed gas pixel detectors with a new design of the gas cell having a larger distance of the walls from the sensitive plane. In this paper we compare the spatial distribution of the measured background for the two design and their residual systematics. Also the impact of the background in the case of SgrB2 a faint extended source in the galactic center region is evaluated.

Paper Details

Date Published: 17 September 2012
PDF: 11 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84431F (17 September 2012); doi: 10.1117/12.925385
Show Author Affiliations
Paolo Soffitta, INAF/IAPS Roma (Italy)
Riccardo Campana, INAF/IAPS Roma (Italy)
Enrico Costa, INAF/IAPS Roma (Italy)
Sergio Fabiani, INAF/IAPS Roma (Italy)
Fabio Muleri, INAF/IAPS Roma (Italy)
Alda Rubini, INAF/IAPS Roma (Italy)
Ronaldo Bellazzini, INFN (Italy)
Alessandro Brez, INFN (Italy)
Massimo Minuti, INFN (Italy)
Michele Pinchera, INFN (Italy)
Gloria Spandre, INFN (Italy)

Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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