The 1.809 MeV line emission associated with the radio-active of 26Al is one of the most intense gamma-ray lines observed in our Galaxy. Fifteen years after the first results obtained by the COMPTEL instrument, the SPI spectrometer aboard the INTEGRAL mission offers a unique opportunity to get more information about its spatial morphology and the nucleosynthesis process at work (see POM July 2003). Thanks to a specifically developed imaging analysis, the main features previously seen with COMPTEL are confirmed: the emission is essentially confined in the inner Galaxy, with possibly a few low-intensity extended structures. In addition, several excesses are seen, suggesting that some of the line-emitting sites are linked to the Galactic spiral arm structure.
The image presented below is based on 10 years of INTEGRAL/SPI observations and built with a spatial resolution of 6 degrees. The superimposed contours correspond to a higher spatial resolution (3 degrees).
Further Resources :
- Article : Bouchet, Jourdain & Roques, 2015, accepted for publication in the ApJ; LINK TO arXiv:1501.05247 (http://arxiv.org/abs/1501.05247)
- ESA INTEGRAL Website : http://www.cosmos.esa.int/web/integral/pom-archive
IRAP Contacts :
- Laurent Bouchet : firstname.lastname@example.org
- Elisabeth Jourdain : email@example.com
- Jean-Pierre Roques : Jean-Pierre.Roques@irap.omp.eu