PoGOLite

A balloon-borne soft gamma-ray polarimeter

M. Pearce, M. Arimoto, M. Axelsson, C. I. Björnsson, G. Bogaert, P. Carlson, W. Craig, Y. Fukazawa, S. Gunji, L. Hjalmarsdotter, T. Kamae, Y. Kanai, Jun Kataoka, J. Katsuta, N. Kawai, J. Kazejev, M. Kiss, W. Klamra, S. Larsson, G. Madejski & 15 others C. Marini Bettolo, T. Mizuno, J. Ng, M. Nomachi, H. Odaka, F. Ryde, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, T. Thurston, M. Ueno, G. Varner, H. Yoshida, T. Yuasa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Polarized gamma-rays are expected from a wide variety of sources including rotationpowered pulsars, accreting black holes and neutron stars, and jet-dominated active galaxies. Polarization measurements provide a powerful probe of the gamma-ray emission mechanism and the distribution of magnetic and radiation fields around the source. No measurements have been performed in the soft gamma-ray band where non-thermal processes are expected to produce high degrees of polarization. The PoGOLite experiment applies well-type phoswich detector technology to polarization measurements in the 25 - 80 keV energy range. The instrument uses Compton scattering and photoabsorption in an array of 217 phoswich detector cells made of plastic and BGO scintillators, and surrounded by active BGO shields. A prototype of the flight instrument has been tested with polarized gammarays and background generated with radioactive sources. The test results and computer simulations confirm that the instrument can detect 10% polarization of a 200 mCrab source in one 6 hour balloon observation. In flight, targets are constrained to within better than 5% of the field-of-view (~5 degrees squared) in order to maximize the effective detection area during observations. The pointing direction on the sky is determined by an attitude control system comprising star trackers, differential GPS receiver system, gyroscopes, accelerometers and magnetometers which provide correction signals to a reaction wheel and torque motor system. Additionally, the entire polarimeter assembly rotates around its viewing axis to minimize systematic bias during observations. Flights are foreseen to start in 2009- 2010 and will target northern sky sources including the Crab pulsar/nebula, Cygnus X-1, and Hercules X-1. These observations will provide valuable information about the pulsar emission mechanism, the geometry around the black hole, and photon transportation in the strongly magnetized neutron star surface, respectively. Future goals include a long duration balloon flight from the Esrange facility in Northern Sweden to Canada.

Original languageEnglish
Title of host publicationProceedings of the 30th International Cosmic Ray Conference, ICRC 2007
PublisherUniversidad Nacional Autonoma de Mexico
Pages479-482
Number of pages4
Volume2
EditionOG PART 1
Publication statusPublished - 2007
Externally publishedYes
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
Duration: 2007 Jul 32007 Jul 11

Other

Other30th International Cosmic Ray Conference, ICRC 2007
CountryMexico
CityMerida, Yucatan
Period07/7/307/7/11

Fingerprint

polarimeters
balloons
gamma rays
pulsars
polarization
neutron stars
torque motors
flight
flight instruments
efferent nervous systems
northern sky
reaction wheels
star trackers
balloon flight
active galaxies
crabs
attitude control
Sweden
detectors
gyroscopes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Pearce, M., Arimoto, M., Axelsson, M., Björnsson, C. I., Bogaert, G., Carlson, P., ... Yuasa, T. (2007). PoGOLite: A balloon-borne soft gamma-ray polarimeter. In Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007 (OG PART 1 ed., Vol. 2, pp. 479-482). Universidad Nacional Autonoma de Mexico.

PoGOLite : A balloon-borne soft gamma-ray polarimeter. / Pearce, M.; Arimoto, M.; Axelsson, M.; Björnsson, C. I.; Bogaert, G.; Carlson, P.; Craig, W.; Fukazawa, Y.; Gunji, S.; Hjalmarsdotter, L.; Kamae, T.; Kanai, Y.; Kataoka, Jun; Katsuta, J.; Kawai, N.; Kazejev, J.; Kiss, M.; Klamra, W.; Larsson, S.; Madejski, G.; Marini Bettolo, C.; Mizuno, T.; Ng, J.; Nomachi, M.; Odaka, H.; Ryde, F.; Tajima, H.; Takahashi, H.; Takahashi, T.; Tanaka, T.; Thurston, T.; Ueno, M.; Varner, G.; Yoshida, H.; Yuasa, T.

Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. Vol. 2 OG PART 1. ed. Universidad Nacional Autonoma de Mexico, 2007. p. 479-482.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pearce, M, Arimoto, M, Axelsson, M, Björnsson, CI, Bogaert, G, Carlson, P, Craig, W, Fukazawa, Y, Gunji, S, Hjalmarsdotter, L, Kamae, T, Kanai, Y, Kataoka, J, Katsuta, J, Kawai, N, Kazejev, J, Kiss, M, Klamra, W, Larsson, S, Madejski, G, Marini Bettolo, C, Mizuno, T, Ng, J, Nomachi, M, Odaka, H, Ryde, F, Tajima, H, Takahashi, H, Takahashi, T, Tanaka, T, Thurston, T, Ueno, M, Varner, G, Yoshida, H & Yuasa, T 2007, PoGOLite: A balloon-borne soft gamma-ray polarimeter. in Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. OG PART 1 edn, vol. 2, Universidad Nacional Autonoma de Mexico, pp. 479-482, 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico, 07/7/3.
Pearce M, Arimoto M, Axelsson M, Björnsson CI, Bogaert G, Carlson P et al. PoGOLite: A balloon-borne soft gamma-ray polarimeter. In Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. OG PART 1 ed. Vol. 2. Universidad Nacional Autonoma de Mexico. 2007. p. 479-482
Pearce, M. ; Arimoto, M. ; Axelsson, M. ; Björnsson, C. I. ; Bogaert, G. ; Carlson, P. ; Craig, W. ; Fukazawa, Y. ; Gunji, S. ; Hjalmarsdotter, L. ; Kamae, T. ; Kanai, Y. ; Kataoka, Jun ; Katsuta, J. ; Kawai, N. ; Kazejev, J. ; Kiss, M. ; Klamra, W. ; Larsson, S. ; Madejski, G. ; Marini Bettolo, C. ; Mizuno, T. ; Ng, J. ; Nomachi, M. ; Odaka, H. ; Ryde, F. ; Tajima, H. ; Takahashi, H. ; Takahashi, T. ; Tanaka, T. ; Thurston, T. ; Ueno, M. ; Varner, G. ; Yoshida, H. ; Yuasa, T. / PoGOLite : A balloon-borne soft gamma-ray polarimeter. Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. Vol. 2 OG PART 1. ed. Universidad Nacional Autonoma de Mexico, 2007. pp. 479-482
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abstract = "Polarized gamma-rays are expected from a wide variety of sources including rotationpowered pulsars, accreting black holes and neutron stars, and jet-dominated active galaxies. Polarization measurements provide a powerful probe of the gamma-ray emission mechanism and the distribution of magnetic and radiation fields around the source. No measurements have been performed in the soft gamma-ray band where non-thermal processes are expected to produce high degrees of polarization. The PoGOLite experiment applies well-type phoswich detector technology to polarization measurements in the 25 - 80 keV energy range. The instrument uses Compton scattering and photoabsorption in an array of 217 phoswich detector cells made of plastic and BGO scintillators, and surrounded by active BGO shields. A prototype of the flight instrument has been tested with polarized gammarays and background generated with radioactive sources. The test results and computer simulations confirm that the instrument can detect 10{\%} polarization of a 200 mCrab source in one 6 hour balloon observation. In flight, targets are constrained to within better than 5{\%} of the field-of-view (~5 degrees squared) in order to maximize the effective detection area during observations. The pointing direction on the sky is determined by an attitude control system comprising star trackers, differential GPS receiver system, gyroscopes, accelerometers and magnetometers which provide correction signals to a reaction wheel and torque motor system. Additionally, the entire polarimeter assembly rotates around its viewing axis to minimize systematic bias during observations. Flights are foreseen to start in 2009- 2010 and will target northern sky sources including the Crab pulsar/nebula, Cygnus X-1, and Hercules X-1. These observations will provide valuable information about the pulsar emission mechanism, the geometry around the black hole, and photon transportation in the strongly magnetized neutron star surface, respectively. Future goals include a long duration balloon flight from the Esrange facility in Northern Sweden to Canada.",
author = "M. Pearce and M. Arimoto and M. Axelsson and Bj{\"o}rnsson, {C. I.} and G. Bogaert and P. Carlson and W. Craig and Y. Fukazawa and S. Gunji and L. Hjalmarsdotter and T. Kamae and Y. Kanai and Jun Kataoka and J. Katsuta and N. Kawai and J. Kazejev and M. Kiss and W. Klamra and S. Larsson and G. Madejski and {Marini Bettolo}, C. and T. Mizuno and J. Ng and M. Nomachi and H. Odaka and F. Ryde and H. Tajima and H. Takahashi and T. Takahashi and T. Tanaka and T. Thurston and M. Ueno and G. Varner and H. Yoshida and T. Yuasa",
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language = "English",
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T2 - A balloon-borne soft gamma-ray polarimeter

AU - Pearce, M.

AU - Arimoto, M.

AU - Axelsson, M.

AU - Björnsson, C. I.

AU - Bogaert, G.

AU - Carlson, P.

AU - Craig, W.

AU - Fukazawa, Y.

AU - Gunji, S.

AU - Hjalmarsdotter, L.

AU - Kamae, T.

AU - Kanai, Y.

AU - Kataoka, Jun

AU - Katsuta, J.

AU - Kawai, N.

AU - Kazejev, J.

AU - Kiss, M.

AU - Klamra, W.

AU - Larsson, S.

AU - Madejski, G.

AU - Marini Bettolo, C.

AU - Mizuno, T.

AU - Ng, J.

AU - Nomachi, M.

AU - Odaka, H.

AU - Ryde, F.

AU - Tajima, H.

AU - Takahashi, H.

AU - Takahashi, T.

AU - Tanaka, T.

AU - Thurston, T.

AU - Ueno, M.

AU - Varner, G.

AU - Yoshida, H.

AU - Yuasa, T.

PY - 2007

Y1 - 2007

N2 - Polarized gamma-rays are expected from a wide variety of sources including rotationpowered pulsars, accreting black holes and neutron stars, and jet-dominated active galaxies. Polarization measurements provide a powerful probe of the gamma-ray emission mechanism and the distribution of magnetic and radiation fields around the source. No measurements have been performed in the soft gamma-ray band where non-thermal processes are expected to produce high degrees of polarization. The PoGOLite experiment applies well-type phoswich detector technology to polarization measurements in the 25 - 80 keV energy range. The instrument uses Compton scattering and photoabsorption in an array of 217 phoswich detector cells made of plastic and BGO scintillators, and surrounded by active BGO shields. A prototype of the flight instrument has been tested with polarized gammarays and background generated with radioactive sources. The test results and computer simulations confirm that the instrument can detect 10% polarization of a 200 mCrab source in one 6 hour balloon observation. In flight, targets are constrained to within better than 5% of the field-of-view (~5 degrees squared) in order to maximize the effective detection area during observations. The pointing direction on the sky is determined by an attitude control system comprising star trackers, differential GPS receiver system, gyroscopes, accelerometers and magnetometers which provide correction signals to a reaction wheel and torque motor system. Additionally, the entire polarimeter assembly rotates around its viewing axis to minimize systematic bias during observations. Flights are foreseen to start in 2009- 2010 and will target northern sky sources including the Crab pulsar/nebula, Cygnus X-1, and Hercules X-1. These observations will provide valuable information about the pulsar emission mechanism, the geometry around the black hole, and photon transportation in the strongly magnetized neutron star surface, respectively. Future goals include a long duration balloon flight from the Esrange facility in Northern Sweden to Canada.

AB - Polarized gamma-rays are expected from a wide variety of sources including rotationpowered pulsars, accreting black holes and neutron stars, and jet-dominated active galaxies. Polarization measurements provide a powerful probe of the gamma-ray emission mechanism and the distribution of magnetic and radiation fields around the source. No measurements have been performed in the soft gamma-ray band where non-thermal processes are expected to produce high degrees of polarization. The PoGOLite experiment applies well-type phoswich detector technology to polarization measurements in the 25 - 80 keV energy range. The instrument uses Compton scattering and photoabsorption in an array of 217 phoswich detector cells made of plastic and BGO scintillators, and surrounded by active BGO shields. A prototype of the flight instrument has been tested with polarized gammarays and background generated with radioactive sources. The test results and computer simulations confirm that the instrument can detect 10% polarization of a 200 mCrab source in one 6 hour balloon observation. In flight, targets are constrained to within better than 5% of the field-of-view (~5 degrees squared) in order to maximize the effective detection area during observations. The pointing direction on the sky is determined by an attitude control system comprising star trackers, differential GPS receiver system, gyroscopes, accelerometers and magnetometers which provide correction signals to a reaction wheel and torque motor system. Additionally, the entire polarimeter assembly rotates around its viewing axis to minimize systematic bias during observations. Flights are foreseen to start in 2009- 2010 and will target northern sky sources including the Crab pulsar/nebula, Cygnus X-1, and Hercules X-1. These observations will provide valuable information about the pulsar emission mechanism, the geometry around the black hole, and photon transportation in the strongly magnetized neutron star surface, respectively. Future goals include a long duration balloon flight from the Esrange facility in Northern Sweden to Canada.

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