Type I supernovae and iron nucleosynthesis in the universe

Details Type I supernovae and iron nucleosynthesis in the universe Type I supernovae and iron nucleosynthesis in the universe

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984japa....5...13s&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 5, March 1984, p. 13-18.

Astronomy and Astrophysics

Astronomy

1

Background Radiation, Cosmology, Gamma Ray Bursts, Iron, Nuclear Fusion, Supernovae, Abundance, Black Holes (Astronomy), Radioactive Decay, Stellar Evolution, Stellar Mass

Scientific paper

It is argued that the iron nucleosynthesis rate in the universe due to SNI outbursts is dependent on the mass function of star formation. Since the mass function depends on the chemical composition and since the masses of SNI precursors have upper limits, the iron nucleosynthesis rate was low at an earlier evolutionary epoch of the universe when mainly massive stars were formed. The iron nucleosynthesis rate should reach a maximum near z of about 0.5. At such or similar value of z, the well-known 'step' in the cosmic gamma-ray background spectrum may be explained by the presence of gamma-ray quanta accompanying the radioactive Co-56 - Fe-56 decay. An argument is presented against the identification of the hidden mass of the universe with black-hole remnants of 'type III' stars.

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