Advertisement

Polarisation measurements with a CdTe pixel array detector for Laue hard X-ray focusing telescopes

  • Ezio CaroliEmail author
  • Rui M. Curado da Silva
  • Alessandro Pisa
  • John B. Stephen
  • Filippo Frontera
  • Matilde T. D. Castanheira
  • Stefano del Sordo
Chapter

Abstract

Polarimetry is an area of high energy astrophysics which is still relatively unexplored, even though it is recognized that this type of measurement could drastically increase our knowledge of the physics and geometry of high energy sources. For this reason, in the context of the design of a Gamma-Ray Imager based on new hard-X and soft gamma ray focusing optics for the next ESA Cosmic Vision call for proposals (Cosmic Vision 2015–2025), it is important that this capability should be implemented in the principal on-board instrumentation. For the particular case of wide band-pass Laue optics we propose a focal plane based on a thick pixelated CdTe detector operating with high efficiency between 60–600 keV. The high segmentation of this type of detector (1–2mm pixel size) and the good energy resolution (a few keV FWHM at 500 keV) will allow high sensitivity polarisation measurements (a few % for a 10 mCrab source in 106s) to be performed. We have evaluated the modulation Q factors and minimum detectable polarisation through the use of Monte Carlo simulations (based on the GEANT 4 toolkit) for on and off-axis sources with power law emission spectra using the point spread function of a Laue lens in a feasible configuration.

Keywords

CdTe Pixel detector Polarization Hard X-ray Laue lens 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Amati, L., et al.: Adv. Space Res. (2006, in press) (astro-ph/0605276)Google Scholar
  2. Caroli, E., et al.: Nucl. Instr. Meth. Phys. Res. A513, 350–356, (2003)ADSGoogle Scholar
  3. Curado da Silva, R.M., et al.: Exp. Astron. 15, 45–65, (2003)CrossRefADSGoogle Scholar
  4. Curado da Silva, R.M., et al.: IEEE Trans. Nucl. Sci. 51(5), 2478–2484, (2004)CrossRefADSGoogle Scholar
  5. Curado da Silva, R.M., et al.: IEEE Trans. Nucl. Sci. 53(1), 383–388, (2006)CrossRefADSGoogle Scholar
  6. McConnell M.L., et al.: Solar Phys. 210, 125–142, (2002)CrossRefADSGoogle Scholar
  7. Frontera, F., et al.: SPIE Proc. 2283, 85–93, (1994)CrossRefADSGoogle Scholar
  8. Frontera, F., et al.: DOI: 10.1007/s10686-006-9050-5 (2006)Google Scholar
  9. Lei, F., Dean, A.J., Hills, G.L.: Space Sci. Rev. 82, 309–388, (1997)CrossRefADSGoogle Scholar
  10. Pisa, A., et al.: SPIE Proc. 5900, 350–359, (2005)ADSGoogle Scholar
  11. Pisa, A., et al.: DOI: 10.1007/s10686-006-9045-2 (2006)Google Scholar
  12. Schönfelder, V., et al.: Astrophys. J. Suppl. 86, 657, (1993)CrossRefADSGoogle Scholar
  13. Stephen, J.B., et al.: AIP Conf. Proc. 587, 816–820, (2001)CrossRefADSGoogle Scholar
  14. Ubertini, P., et al.: Astron. Astrophys. 411(1), L131, (2003)CrossRefADSGoogle Scholar

Copyright information

© Springer 2006

Authors and Affiliations

  • Ezio Caroli
    • 1
    Email author
  • Rui M. Curado da Silva
    • 2
  • Alessandro Pisa
    • 3
  • John B. Stephen
    • 1
  • Filippo Frontera
    • 1
    • 3
  • Matilde T. D. Castanheira
    • 2
  • Stefano del Sordo
    • 4
  1. 1.INAF/IASF-BolognaBolognaItaly
  2. 2.Departemento de Fisica da Universidade de CoimbraCoimbraPortugal
  3. 3.Dip. di FisicaUniversità di FerraraFerraraItaly
  4. 4.INAF/IASF-PalermoPalermoItaly

Personalised recommendations