Type Ia supernova counts at high z : signatures of cosmological models and progenitors

摘要

Determination of the rates at which Type Ia supernovae (Sne Ia) occur in the early universe can give signatures of the time spent by the binary progenitor systems to reach explosion and of the geometry of the numbers. Observations made within the Supernova Cosmology Project are already providing the first numbers. Here it is Shown that, for may assumed SNe Ia progenitor, SNe Ia counts up to m_R ≌ 23-26 are useful tests of the SNe Ia Progenitor systems and cosmological tracers of a possible nonzero value of the cosmological constant, Λ. The SNe Ia counts at high redshifts compare differently with those at lower redshifts depending on the cosmological Model.