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

TL;DR

The paper reports the first detection of an astrophysical source, the Crab Nebula, using the Nuclear Compton Telescope, a compact gamma-ray observatory capable of imaging and spectroscopy in the soft gamma-ray regime.

Contribution

It demonstrates the successful imaging of the Crab Nebula with a next-generation compact Compton telescope, establishing its capability for astrophysical source detection.

Findings

Crab Nebula detected at 4-sigma significance

First astrophysical source detection by a CCT

NCT successfully performed imaging and spectroscopy in gamma-ray regime

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.