COMPTEL 1.8 MeV all sky survey: The Cygnus region

Plu¨schke, S.; Diehl, R.; Scho¨nfelder, V.; Weidenspointner, G.; Bloemen, H.; Hermsen, W.; McConnell, M.; Ryan, J.; Bennett, K.; Oberlack, U.; Kno¨dlseder, J.
April 2000
AIP Conference Proceedings;2000, Vol. 510 Issue 1, p35
Academic Journal
We present an updated version of COMPTEL’s 1.809 MeV sky survey. Based on eight years of observations we compare results from different imaging techniques using background from adjacent energy bands. We confirm the previously reported characteristics of the galactic 1.809 MeV emission, specifically an extended galactic ridge emission, mainly concentrated towards the inner galaxy, a peculiar emission feature in the Cygnus region, and a low-intensity ridge extending towards Carina and Vela. Because this gamma ray line is due to the decay of radioactive [sup 26]Al, predominantly synthesized in massive stars, one anticipates flux enhancements aligned with regions of recent star formation. This is born out by the observations. In particular the Cygnus feature, first presented in 1996 based on three years of COMPTEL data, is confirmed. Based on the stellar population we distinguish three prominent areas in this region, for which we separately derive fluxes, and discuss interpretations. © 2000 American Institute of Physics.


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