The Revised COMPTEL Orion Results

Details The Revised COMPTEL Orion Results The Revised COMPTEL Orion Results

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...521l.137b&link_type=abstract

The Astrophysical Journal, Volume 521, Issue 2, pp. L137-L140.

Astronomy and Astrophysics

Astronomy

24

Acceleration Of Particles, Ism: Cosmic Rays, Gamma Rays: Observations, Nuclear Reactions, Nucleosynthesis, Abundances

Scientific paper

COMPTEL observations of the Orion/Monoceros region have shown distinct evidence for excessive 3-7 MeV emission that was attributed to nuclear de-excitation lines from accelerated ^12C and ^16O nuclei. Unfortunately, we must conclude now that this appears to be a spurious result. This conclusion follows from a better understanding of the instrumental background, from a better exposure of the region, and from an improved analysis method. We show here how the impact of each of these gradually reduces the signal to a less than 3 sigma result. The prime underlying cause seems to be ^24Na activation in and around the upper COMPTEL detectors. Combining all available data, we now set a 2 sigma flux upper limit on the 3-7 MeV emission of Orion of 3x10^-5 gamma cm^-2 s^-1, to be compared with the previously derived flux of ~10^-4 gamma cm^-2 s^-1.

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