SPI observations of the diffuse ^60Fe emission in the Galaxy

By Wei Wang, M. Harris, R. Diehl, H. Halloin, B. Cordier, A. Strong, K. Kretschmer, J. Knoedlseder, P. Jean, G. Lichti and 5 more. 2007

133 citations recorded by the source corpus.

Gamma-ray line emission from radioactive decay of 60Fe provides constraints on nucleosynthesis in massive stars and supernovae. The spectrometer SPI on board INTEGRAL has accumulated nearly three years of data on gamma-ray emission from the Galactic plane. We have analyzed these data with suitable instrumental-background models and sky distributions to produce high-resolution spectra of Galactic emission. We detect the gamma-ray lines from 60Fe decay at 1173 and 1333 keV, obtaining an improvement over our earlier measurement of both lines with now 4.9 sigma significance for the combination of the two lines. The average flux per line is (4.4 \pm 0.9) \times 10^{-5} ph cm^{-2} s^{-1} rad^{-1} for the inner Galaxy region. Deriving the Galactic 26Al gamma-ray line flux with using the same set of observations and analysis method, we determine the flux ratio of 60Fe/26Al gamma-rays as 0.148 \pm 0.06. The current theoretical predictions are still consistent with our result.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6789632a9a98eb4b7508ece054e287fe963a8680

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Citations in the corpus

CORE-COLLAPSE SUPERNOVAE FROM 9 TO 120 SOLAR MASSES BASED ON NEUTRINO-POWERED EXPLOSIONS (2015, background): “Gamma-ray line observations (Wang et al. 2007) imply a number ratio of Fe60 to Al26 in the interstellar medium of 0.148, which implies a mass ratio of 0.34.”
Abundance, distribution, and origin of 60Fe in the solar protoplanetary disk (2012, background): “Analysis of -ray emissions from the galactic plane give a present average flux 60 Fe/ 26 Al ratio of 0.148 0.06 (Wang et al., 2007), which translates into a 60 Fe/ 26 Al ratio of 0.1482.62/0.705=0.55±0.22.”