New COMPTEL Results on MeV Gamma Rays from the Orion/Monoceros Region

Details New COMPTEL Results on MeV Gamma Rays from the Orion/Monoceros Region New COMPTEL Results on MeV Gamma Rays from the Orion/Monoceros Region

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475l..25b&link_type=abstract

Astrophysical Journal Letters v.475, p.L25

Astronomy and Astrophysics

Astronomy

31

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

Scientific paper

We present new COMPTEL observations of the Orion/Monoceros region, confirming our previous report of excessive 3--7 MeV emission which we tentatively attributed to nuclear deexcitation lines at 4.44 and 6.13 MeV from accelerated 12C and 16O nuclei. We show first results from a combination of all data obtained during the first five years of the mission, with emphasis on the extent of the emission region. The 3--7 MeV radiation is observed at the 9 sigma significance level with a flux of (12.8 +/- 1.5) x 10-5 gamma cm-2 s-1, consistent with our previous findings. In addition, we can firmly conclude now that one single source cannot explain the measured intensity distribution: we find that the emission extends over the complex (the Orion A and B and the Mon R2 clouds), but it may actually be due to a few localized source regions. Evidence (4.4 sigma ) for emission from the Mon OB1/OB2 area is appearing as well. We present a preliminary spectrum (not fully deconvolved), which indicates that the emission is widely spread over the 3--7 MeV range, suggesting a dominantly broad-line origin from energetic C and O nuclei if indeed caused by nuclear lines. The spectrum shows features that might be due to splitting of the C and O lines, but further substantiation should come from forthcoming spectral analyses and new observations.

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