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29 March 2024
 
  » arxiv » astro-ph/0502219

 Article overview


Detection of gamma-ray lines from interstellar 60Fe by the high resolution spectrometer SPI
M.J. Harris ; J. Knodlseder ; P. Jean ; E. Cisana ; R. Diehl ; G.G. Lichti ; J.-P. Roques ; S. Schanne ; G. Weidenspointner ;
Date 10 Feb 2005
Journal Astron.Astrophys. 433 (2005) L49-L52
Subject astro-ph
Affiliation CESR Toulouse, IASF Milano, MPE Garching, CEA Saclay
AbstractIt is believed that core-collapse supernovae (CCSN), occurring at a rate about once per century, have seeded the interstellar medium with long-lived radioisotopes such as 60Fe (half-life 1.5 Myr), which can be detected by the gamma rays emitted when they beta-decay. Here we report the detection of the 60Fe decay lines at 1173 keV and 1333 keV with fluxes 3.7 +/- 1.1 x 10(-5) ph cm(-2) s(-1) per line, in spectra taken by the SPI spectrometer on board INTEGRAL during its first year. The same analysis applied to the 1809 keV line of 26Al yielded a line flux ratio 60Fe/26Al = 0.11 +/- 0.03. This supports the hypothesis that there is an extra source of 26Al in addition to CCSN.
Source arXiv, astro-ph/0502219
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