P. Ruizlapuente et R. Canal, TYPE IA SUPERNOVA COUNTS AT HIGH-Z - SIGNATURES OF COSMOLOGICAL MODELS AND PROGENITORS, The Astrophysical journal, 497(2), 1998, pp. 57-60
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 bin
ary progenitor systems to reach explosion and of the geometry of the u
niverse. Observations made within the Supernova Cosmology Project are
already providing the first numbers. Here it is shown that, for any as
sumed SNe Ia progenitor, SNe Ia counts up to m(R) similar or equal to
23-26 are useful tests of the SNe Ia progenitor systems and cosmologic
al tracers of a possible nonzero value of the cosmological constant, L
ambda. The SNe Ia counts at high redshifts compare differently with th
ose at lower redshifts depending on the cosmological model. A flat, Om
ega(Lambda)-dominated universe would show a more significant increase
of the SNe Ia counts at z similar to 1 than a flat, Omega(M) = 1 unive
rse. Here we consider three sorts of universes: a flat universe with H
-0 = 65 km s(-1) Mpc(-1), Omega(M) = 1.0, Omega(Lambda) = 0.0; an open
universe with H-0 = 65 km s(-1) Mpc(-1), Omega(M) = 0.3, Omega(Lambda
) = 0.0; and a hat, Lambda-dominated universe with H-0 = 65 km s(-1) M
pc(-1), Omega(M) = 0.3, Omega(Lambda) = 0.7. On the other hand, the SN
e Ia counts from one class of binary progenitors (double-degenerate sy
stems) should not increase steeply in the z = 0-1 range, contrary to w
hat should be seen for other binary progenitors. A measurement of the
SNe Ia counts up to z similar to 1 is within reach of ongoing SNe Ia s
earches at high redshifts.