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Proceedings Paper

PANGU: A high resolution gamma-ray space telescope
Author(s): Xin Wu; Meng Su; Alessandro Bravar; Jin Chang; Yizhong Fan; Martin Pohl; Roland Walter
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Paper Abstract

We describe the instrument concept of a high angular resolution telescope dedicated to the sub-GeV (from ≥10 MeV to ≥1 GeV) gamma-ray photon detection. This mission, named PANGU (PAir-productioN Gamma-ray Unit), has been suggested as a candidate for the joint small mission between the European Space Agency (ESA) and the Chinese Academy of Science (CAS). A wide range of topics of both astronomy and fundamental physics can be attacked with PANGU, covering Galactic and extragalactic cosmic-ray physics, extreme physics of a variety of extended (e.g. supernova remnants, galaxies, galaxy clusters) and compact (e.g. black holes, pulsars, gamma-ray bursts) objects, solar and terrestrial gamma-ray phenomena, and searching for dark matter decay and/or annihilation signature etc. The unprecedented point spread function can be achieved with a pair-production telescope with a large number of thin active tracking layers to precisely reconstruct the pair-produced electron and positron tracks. Scintillating fibers or thin silicon micro-strip detectors are suitable technology for such a tracker. The energy measurement is achieved by measuring the momentum of the electrons and positrons through a magnetic field. The innovated spectrometer approach provides superior photon pointing resolution, and is particular suitable in the sub-GeV range. The level of tracking precision makes it possible to measure the polarization of gamma rays, which would open up a new frontier in gamma-ray astronomy. The frequent full-sky survey at sub-GeV with PANGU's large field of view and significantly improved point spread function would provide crucial information to GeV-TeV astrophysics for current/future missions including Fermi, DAMPE, HERD, and CTA, and other multi-wavelength telescopes.

Paper Details

Date Published: 25 July 2014
PDF: 15 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91440F (25 July 2014); doi: 10.1117/12.2057251
Show Author Affiliations
Xin Wu, Univ. de Genève (Switzerland)
Meng Su, MIT Kavli Institute for Astrophysics and Space Research (United States)
Alessandro Bravar, Univ. de Genève (Switzerland)
Jin Chang, Purple Mountain Observatory (China)
Yizhong Fan, Purple Mountain Observatory (China)
Martin Pohl, Univ. de Genève (Switzerland)
Roland Walter, ISDC Data Ctr. for Astrophysics, Univ. de Genève (Switzerland)

Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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