Conclusion

In this chapter, we presented the diagrams of Hubble out of U and B which we built starting from a batch of supernovæ close exits of the literature and our batch of 6 supernovæ remote.

The adjustment of these two diagrams of Hubble enabled us to make an estimate of the cosmological parameters by considering a flat universe. The results which we find in both cases, are in agreement with the preceding estimates made using supernovæ of the type Ia (riess1998, perlmutter1999, knop2003) with values of $\Omega _ \Lambda$ around 0.7).

However, the systematic errors remain relatively large related partly to the size of our batch of supernova (4 out of B and 3 out of U compared with the 42 of perlmutter1999). The use in our analysis of a relation of standardization using the color also introduced a significant error.

Lastly, both supernovæ with shifts towards the red beyond 1 and in particular 2001gn present broad photometric errors of measurement.