Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473..990m&link_type=abstract
Astrophysical Journal v.473, p.990
Astronomy and Astrophysics
Astronomy
11
Gamma Rays: Observations, Ism: Cosmic Rays, Acceleration Of Particles, Stars: Abundances
Scientific paper
The discovery of γ-ray line emission in the 3-7 MeV range from the Orion complex was recently reported. The observed Compton Telescope (COMPTEL) spectrum suggested that the emission results from the de-excitation of excited states of 12C and 160. We report on a search for these lines using the Oriented Scintillation Spectroscopy Experiment (OSSE) on the Compton Gamma Ray Observatory (CGRO) during a 5 week observation in 1995 from April to June. The OSSE detectors were pointed midway between the Orion A and B radio sources in three different viewing configurations. We find no compelling evidence for line emission near 4.4 or 6.1 MeV. The sensitivity of the OSSE measurements is dependent on the widths of the reported C and 0 lines and on the source location and spatial extent. A point source at the flux level reported by COMPTEL and located on-axis would have been detected by OSSE at ˜7 σ and ˜5 σ levels of confidence for narrow and broad lines, respectively. A spatially distributed source of the same strength with a distribution following the intense CO emission localized around Orion A and Orion B would have been detected by OSSE at ˜3.5 σ and ˜2.5 σ, respectively. Thus, these OSSE observations require that any γ-ray line source must be even more extended to be consistent with the reported COMPTEL intensity.
Grove Eric J.
Johnson Neil W.
Kurfess James D.
McNaron-Brown Kellie
Murphy Ronald J.
No associations
LandOfFree
Limits on Nuclear Gamma-Ray Emission from Orion does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Limits on Nuclear Gamma-Ray Emission from Orion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Limits on Nuclear Gamma-Ray Emission from Orion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-819626