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An INTEGRAL/IBIS view of young Galactic SNRs through the 44Ti gamma-ray lines
Ballet, J.; Decourchelle, A.; Vink, J. +3 more
We present preliminary results of INTEGRAL/IBIS observations on Cas A, Tycho and Vela Junior supernova remnants in the line emission of 44Ti. This radioactive nucleus is thought to be exclusively produced in supernovae during the first stages of the explosion. It has a lifetime of about 87 yr and is then the best indicator of young SNRs…
Nucleosynthesis of 60Fe in massive stars
Limongi, Marco; Chieffi, Alessandro
We discuss certain aspects of the production of 60Fe in massive stars in the range between 11 and 120M⊙, both in the hydrostatic and explosive stages. We also compare the 60Fe/26Al γ-ray line flux ratio obtained in the present calculations to the detected value reported by INTEGRAL/SPI.
Measuring 26Al and 60Fe in the Galaxy
Diehl, Roland
With the SPI high-resolution spectrometer on INTEGRAL, new results have been obtained for long-lived radioactive 26Al and 60Fe in our Galaxy: 26Al sources apparently share the pattern of Galactic rotation in the inner Galaxy, and thus allow to estimate a total mass of 26Al in the Galaxy of 2.8M⊙
Distribution of positron annihilation radiation
Milne, Peter A.
The SPI instrument on-board the ESA/INTEGRAL satellite is engaged in a mission-long study of positron annihilation radiation from the Galaxy. Early results suggest that the disk component is only weakly detected at 511 keV by SPI. We review CGRO/OSSE, TGRS and SMM studies of 511 keV line and positronium continuum emission from the Galaxy in light …
Positron production and annihilation in the Milky Way
Prantzos, Nikos
SNIa in the Milky Way bulge may supply about 12% of the positrons required by observations of the 511 keV emission from the inner Galaxy, while positrons from disk SNIa may account for the totality of that emission. It is argued here that most of the disk positrons propagate away from the disk (due to the low density environment) and the resulting…
Scientific highlights from INTEGRAL
Winkler, Christoph
The gamma-ray observatory INTEGRAL was launched in October 2002 and produces since then a wealth of discoveries and important new results. I will present a selection of scientific highlights obtained during the first 2.5 years of the mission.
The Type Ia Supernova rate in the local Universe
Strigari, Louis E.
Current measurements of the Type Ia Supernova (SNIa) rate, as determined by standard astronomical methods, are in reasonable agreement with measurements of the cosmic star formation rate combined with simple models for SNIa progenitors. However, systematic uncertainties still undermine a precise determination of the SNIa rate. Recent models of the…