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  • Kamae, Tuneyoshi (author)

PoGOLite - A high sensitivity balloon-borne soft gamma-ray polarimeter

  • Article/chapterEnglish2008

Publisher, publication year, extent ...

  • Elsevier BV,2008
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-57905
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-57905URI
  • https://doi.org/10.1016/j.astropartphys.2008.07.004DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-79524URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-2839URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • authorCount :39
  • QC 20120209
  • Kamae, Tuneyoshi Andersson, Viktor Arimoto, Makoto Axelsson, Magnus Bettolo, Cecilia Marini Bjornsson, Claes-Ingvar Bogaert, Gilles Carlson, Per Craig, William Ekeberg, Tomas Engdegdrd, Olle Fukazawa, Yasushi Gunji, Shuichi Hjalmarsdotter, Linnea Iwan, Bianca Kanai, Yoshikazu Kataoka, Jun Kawai, Nobuyuki Kazejev, Jaroslav Kiss, Mozsi 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 Varneri, Gary Yamamoto, Kazuhide Yamashita, Yuichiro Ylinen, Tomi Yoshida, Hiroaki
  • We describe a new balloon-borne instrument (PoGOLite) capable of detecting 10% polarisation from 200 mCrab point-like sources between 25 and 80 keV in one 6-h 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. Synchrotron radiation, inverse Compton scattering and propagation through high magnetic fields are likely to produce high degrees of polarisation in the energy band of the instrument. We demonstrate, through tests at accelerators, with radioactive sources and through computer simulations, that PoGOLite will be able to detect degrees of polarisation as predicted by models for several classes of high energy sources. 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 while securing a large effective area has been the greatest 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 Held of view (FWHM = 1.25 msr, 2.0 deg x 2.0 deg) obtained with detector cells and the use of thick background shields warrant a large effective area for polarisation measurements (similar to 228 cm(2) at E = 40 keV) without sacrificing the signal-to-noise ratio. Simulation studies for an atmospheric overburden of 3-4 g/cm(2) indicate that neutrons and gamma-rays entering the PDC assembly through the shields are dominant backgrounds. Off-line event selection based on recorded phototube waveforms and Compton kinematics reduce the background to that expected for a similar to 100 mCrab source between 25 and 50 keV. A 6-h observation of the Crab pulsar will differentiate between the Polar Cap/Slot Gap, Outer Gap, and Caustic models with greater than 5 sigma significance; and also cleanly identify the Compton reflection component in the Cygnus X-1 hard state. Long-duration flights will measure the dependence of the polarisation across the cyclotron absorption line in Hercules X-1. A scaled-down instrument will be flown as a pathfinder mission from the north of Sweden in 2010. The first science flight is planned to take place shortly thereafter. 

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Andersson, ViktorKTH,Fysik(Swepub:kth)u1zckfsh (author)
  • Arimoto, Makoto (author)
  • Axelsson, MagnusStockholms universitet,Institutionen för astronomi(Swepub:kth)u1pcmyc0 (author)
  • Bettolo, Cecilia MariniKTH,Fysik(Swepub:kth)u10rjtjp (author)
  • Björnsson, Claes-IngvarStockholms universitet,Institutionen för astronomi(Swepub:su)bjornsson (author)
  • Bogaert, Gilles (author)
  • Carlson, PerKTH,Partikel- och astropartikelfysik(Swepub:kth)u1ua4u32 (author)
  • Craig, William (author)
  • Ekeberg, TomasKTH,Fysik(Swepub:kth)u1in0ld6 (author)
  • Engdegård, OlleKTH,Fysik(Swepub:kth)u140w3tb (author)
  • Fukazawa, Yasushi (author)
  • Gunji, Shuichi (author)
  • Hjalmarsdotter, LinneaStockholms universitet,Institutionen för astronomi (author)
  • Iwan, BiancaKTH,Fysik(Swepub:kth)u1icdggf (author)
  • Kanai, Yoshikazu (author)
  • Kataoka, Jun (author)
  • Kawai, Nobuyuki (author)
  • Kazejev, JaroslavKTH,Fysik(Swepub:kth)u1c82bt1 (author)
  • Kiss, MozsiKTH,Partikel- och astropartikelfysik(Swepub:kth)u13dvf5u (author)
  • Klamra, WlodzimierzKTH,Partikel- och astropartikelfysik(Swepub:kth)u1je1ghu (author)
  • Larsson, StefanKTH,Stockholms universitet,Institutionen för astronomi,Fysik(Swepub:kth)u1xfjjbn (author)
  • Madejski, Grzegorz (author)
  • Mizuno, Tsunefumi (author)
  • Ng, Johnny (author)
  • Pearce, MarkKTH,Partikel- och astropartikelfysik(Swepub:kth)u17jptna (author)
  • Rydé, FelixKTH,Partikel- och astropartikelfysik(Swepub:kth)u1tlyg6w (author)
  • Suhonen, MarkusKTH,Fysik(Swepub:kth)PI000000 (author)
  • TaJima, Hiroyasu (author)
  • Takahashi, Hiromitsu (author)
  • Ylinen, T.Högskolan i Kalmar,Naturvetenskapliga institutionen(Swepub:lnu)eylto (author)
  • Tanaka, Takuya (author)
  • Thurston, Timothy (author)
  • Ueno, Masaru (author)
  • Varneri, Gary (author)
  • Yamamoto, Kazuhide (author)
  • Yamashita, Yuichiro (author)
  • Ylinen, TomiKTH,Fysik(Swepub:kth)u1vmovqg (author)
  • Yoshida, Hiroaki (author)
  • KTHFysik (creator_code:org_t)

Related titles

  • In:Astroparticle physics: Elsevier BV30:2, s. 72-840927-65051873-2852

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