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Positron astronomy with SPI/INTEGRAL

Knödlseder, J.; Schanne, S.; Cordier, B. +7 more

We provide an overview of positron astronomy results that have been obtained using the INTEGRAL spectrometer SPI, and discuss their implications for the still mysterious origin of positrons in our Galaxy. It has long been known that the 511 keV positron annihilation emission is strongest from the central region of our Galaxy. Recently, it has been…

The Cygnus region: A laboratory for nucleosynthesis

Martin, Pierrick; Knödlseder, Jürgen; Meynet, Georges

We have observed the Cygnus region in the gamma-ray decay lines of ²⁶Al and ⁶⁰Fe with the INTEGRAL/SPI spectrometer. A study of the morphology of the 1809 keV emission from ²⁶Al suggests an emission region centered about the massive star cluster Cyg OB2, with a characteristic size between 6° and 9° or possibly high…