تقرير
PoGOLite - A High Sensitivity Balloon-Borne Soft Gamma-ray Polarimeter
| العنوان: | PoGOLite - A High Sensitivity Balloon-Borne Soft Gamma-ray Polarimeter |
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| المؤلفون: | Kamae, Tuneyoshi, Andersson, Viktor, Arimoto, Makoto, Axelsson, Magnus, Bettolo, Cecilia Marini, Björnsson, Claes-Ingvar, Bogaert, Gilles, Carlson, Per, Craig, William, Ekeberg, Tomas, Engdegård, Olle, Fukazawa, Yasushi, Gunji, Shuichi, Hjalmarsdotter, Linnea, Iwan, Bianca, Kanai, Yoshikazu, Kataoka, Jun, Kawai, Nobuyuki, Kazejev, Jaroslav, Kiss, Mózsi, Klamra, Wlodzimierz, Larsson, Stefan, Madejski, Grzegorz, Mizuno, Tsunefumi, Ng, Johnny, Pearce, Mark, Ryde, Felix, Suhonen, Markus, Tajima, Hiroyasu, Takahashi, Hiromitsu, Takahashi, Tadayuki, Tanaka, Takuya, Thurston, Timothy, Ueno, Masaru, Varner, Gary, Yamamoto, Kazuhide, Yamashita, Yuichiro, Ylinen, Tomi, Yoshida, Hiroaki |
| المصدر: | Astropart.Phys.30:72-84,2008 |
| سنة النشر: | 2007 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | We describe a new balloon-borne instrument (PoGOLite) capable of detecting 10% polarisation from 200mCrab point-like sources between 25 and 80keV in one 6 hour flight. Polarisation measurements in the soft gamma-ray band are expected to provide a powerful probe into high-energy emission mechanisms as well as the distribution of magnetic fields, radiation fields and interstellar matter. At present, only exploratory polarisation measurements have been carried out in the soft gamma-ray band. Reduction of the large background produced by cosmic-ray particles has been the biggest challenge. PoGOLite uses Compton scattering and photo-absorption in an array of 217 well-type phoswich detector cells made of plastic and BGO scintillators surrounded by a BGO anticoincidence shield and a thick polyethylene neutron shield. The narrow FOV (1.25msr) obtained with well-type phoswich detector technology and the use of thick background shields enhance the detected S/N ratio. Event selections based on recorded phototube waveforms and Compton kinematics reduce the background to that expected for a 40-100mCrab source between 25 and 50keV. A 6 hour observation on the Crab will differentiate between the Polar Cap/Slot Gap, Outer Gap, and Caustic models with greater than 5 sigma; and also cleanly identify the Compton reflection component in the Cygnus X-1 hard state. The first flight is planned for 2010 and long-duration flights from Sweden to Northern Canada are foreseen thereafter. Comment: 11 pages, 11 figures, 2 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.astropartphys.2008.07.004 |
| URL الوصول: | http://arxiv.org/abs/0709.1278 |
| رقم الأكسشن: | edsarx.0709.1278 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.astropartphys.2008.07.004 |
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