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Astron. Astrophys. 329, 624-630 (1998)

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OSSE observations of the Orion giant molecular cloud during 1996

M.J. Harris 1, R.J. Murphy 2, G.H. Share 2, W.N. Johnson 2, R.L. Kinzer 2, J.D. Kurfess 2, K. McNaron-Brown 3, and W.R. Purcell 4

1 USRA/GVSP, Code 661, NASA/Goddard Spaceflight Center, Greenbelt, MD 20771, USA
2 Naval Research Laboratory, Code 7650, Washington DC 20375-5352, USA
3 Physics/CSI, George Mason University, Fairfax, VA 22030, USA
4 Dept. of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA

Received 12 December 1996 / Accepted 20 August 1997


We have combined all OSSE spectra of the Orion molecular cloud complex obtained through the end of 1996 and searched them for evidence of cosmic-ray induced [FORMULA] -ray lines in the 3-7 MeV energy range, as detected by COMPTEL (Bloemen et al. 1994, 1997). We do not detect any significant line emission; our flux estimate for broad-line emission of [FORMULA] is consistent with the spatially-extended flux [FORMULA] measured by Bloemen et al. (1997).

Key words: ISM: individual objects: Orion clouds – cosmic rays – gamma-rays: observations

Send offprint requests to: M.J. Harris

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© European Southern Observatory (ESO) 1998

Online publication: December 8, 1997