Physics – Nuclear Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..704..361s&link_type=abstract
TOURS SYMPOSIUM ON NUCLEAR PHYSICS V; Tours 2003. AIP Conference Proceedings, Volume 704, pp. 361-368 (2004).
Physics
Nuclear Physics
Chemical Composition And Chemical Evolution, Gamma-Ray
Scientific paper
From previous gamma-ray missions, especially SIGMA on GRANAT and OSSE and COMPTEL on the Compton Gamma Ray Observatory we have learnt that the sky is rich in gamma-ray line emitting objects and phenomena. Though we have certainly so far seen only the tip the iceberg, the first results are already exciting. COMPTEL produced the first-ever all-sky map in light of a radioactive gamma-ray line, namely that of radioactive 26Al, and OSSE mapped the inner part of the galactic plane in the light of the electron-positron annihilation line. In addition, 1.157 MeV line emission from radioactive 44Ti was detected by COMPTEL for the first time from a supernova remnant, namely Cas-A and later possibly also from the previously unknown remnant RX JO852-4622 as well. OSSE detected 57Co line emission from SN 1987a in the Large Magellanic Cloud after 56Co emission from this supernova had been detected already prior to the Compton mission, and COMPTEL saw hints of 56Co line emission from the extragalactic supernova SN1991 T of type Ia. More recently COMPTEL found also hints for 22Na line emission at 1.275 MeV from the classical nova N Cas 1995 and possible evidence for emission of the same line from the Galactic bulge region which may be due to unresolved novae. Already prior to these Compton observations, SIGMA provided exciting results on positron-electron annihilation features near 511 keV from binary systems with black hole candidates (Nova Muscae and 1 E 1740-2942). Very recently additional results, especially on the widths of the 1.809 MeV and the 511 keV annihilation lines, have been obtained by HESS I and SPI-INTEGRAL.
A review of all previous observations and the prospects of further studies with SPI-INTEGRAL are given.
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