Abstract
Gamma‐ray lines from radioactive isotopes ejected into interstellar space by cosmic nucleosynthesis events can be observed with space telescopes. In the past decade, the Compton Observatory has provided a survey of the sky for the isotopes 56Co, ssNa, 44Ti, and 26Al, detecting supernova radioactivity and the diffuse glow of longlived radioactivity from massive stars in the Galaxy. Other experiments have demonstrated the additional capabilities of high‐resolution spectroscopy with Ge detectors, identifying those isotopes, and measuring Doppler broadenings of the gamma‐ray lines of SN1987A and 26Al. With ESA’s INTEGRAL satellite, since October 2002 a space‐based Ge gamma‐ray telescope is in operation. First year’s results include a detection of annihilation emission and 26Al emission from ther inner Galaxy, and 26Al emission from the Cygnus region.
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