Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.158r&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
Results from high-z Type Ia supernovae studies suggest that we live in a low-OmegaM universe with a non-zero Lambda. As part of the programme which performs supernova searches, the Supernova Cosmology Project derives the evolution of the rates of supernovae along redshift space. It will be shown that such observational estimates can help to discriminate the supernova progenitor through comparison with predictions for different evolutionary paths to explosion. It can also be a test of the Lambda-dominacy in our Universe. Another relevant outcome of this research is the role of high-z supernovae in supplying the cosmological gamma-ray background in the MeV range. Such contribution is calculated by modeling the gamma-ray escape from SNe Ia and the estimated high-z SNe Ia rates. Uncertainties will be discussed and future prospects along these lines will be briefly summarized.
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