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Detection and Imaging of the Crab Nebula with the Nuclear Compton Telescope

Authors :: Bandstra, M. S.
Bellm, E. C.
Boggs, S. E.
Perez-Becker, D.
Zoglauer, A.
Chang, H. -K.
Chiu, J. -L.
Liang, J. -S.
Chang, Y. -H.
Liu, Z. -K.
Hung, W. -C.
Huang, M. -H. A.
Chiang, S. J.
Run, R. -S.
Lin, C. -H.
Amman, M.
Luke, P. N.
Jean, P.
von Ballmoos, P.
Wunderer, C. B.
Publication Year :: 2011
Abstract: The Nuclear Compton Telescope (NCT) is a balloon-borne Compton telescope designed for the study of astrophysical sources in the soft gamma-ray regime (200 keV--20 MeV). NCT's ten high-purity germanium crossed-strip detectors measure the deposited energies and three-dimensional positions of gamma-ray interactions in the sensitive volume, and this information is used to restrict the initial photon to a circle on the sky using the Compton scatter technique. Thus NCT is able to perform spectroscopy, imaging, and polarization analysis on soft gamma-ray sources. NCT is one of the next generation of Compton telescopes --- so-called compact Compton telescopes (CCTs) --- which can achieve effective areas comparable to COMPTEL's with an instrument that is a fraction of the size. The Crab Nebula was the primary target for the second flight of the NCT instrument, which occurred on 17--18 May 2009 in Fort Sumner, New Mexico. Analysis of 29.3 ks of data from the flight reveals an image of the Crab at a significance of 4-sigma. This is the first reported detection of an astrophysical source by a CCT.<br />Comment: 10 pages, 9 figures, accepted for publication in the Astrophysical Journal