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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 | Abstract: | It 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 | Services: | Forum | Review | PDF | Favorites |
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