Gamma-ray observations of the Crab Region using a coded-aperture telescope

Journal Article · Thu Oct 01 00:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165650· OSTI ID:5553633

Mcconnell, M L; Dunphy, P P; Forrest, D J; Chupp, E L; Owens, A

The region of the Galactic anticenter, including the Crab Nebula, was observed during a balloon flight of the University of New Hampshire Directional Gamma-Ray Telescope employing the coded-aperture imaging technique to image celestial gamma-radiation between 160 keV and 9.3 MeV. The background systematics are treated with a simple and relatively straightforward correction procedure. The results demonstrate that the coded-aperture procedure is a viable approach for imaging not only point sources of radiation, but also extended sources of emission. The results for the Crab's photon spectrum are consistent with a power-law spectrum. Upper limits on the flux levels of line emission at 405 keV and 1050 keV and on the flux from the X-ray binary source A0535 + 26 and diffuse Galactic emission from the anticenter region are derived. 35 references.

• Research Organization: New Hampshire Univ., Durham
• OSTI ID: 5553633
• Journal Information: Astrophys. J.; (United States), Vol. 321
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRAB NEBULA
GAMMA SPECTRA
APERTURES
COSMIC X-RAY SOURCES
LIMITING VALUES
MILKY WAY
POINT SOURCES
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
GALAXIES
NEBULAE
OPENINGS
RADIATION SOURCES
SPECTRA
SUPERNOVA REMNANTS
640105* - Astrophysics & Cosmology- Galaxies