Diagram of Hubble out of U

Both supernovæ most remote of our batch with a shift towards the red around 1 were mainly observed in filter I correspondent with the filter U in the reference frame of the supernova (figure 10.10 ). We thus will use the close supernovæ observed out of U to build a new estimator of distance.

Appear: Filter R and I in the observant reference frame and U and B in the reference frame for a supernova with a redshift of 1.1. Filter I observer corresponds to the filter U.

We will apply the same method as for the observations out of B and out of V We will use from now on the magnitude U in the reference frame of the supernova like estimator of distance and the color $U-b$ to estimate a new relation of standardization.

We have for that about fifteen supernovæ whose redshifts are larger than 0.01. The parameters of their lightcurve are given in C.2 10.11 shows their diagram of Hubble out of U not corrected for the color and the factor of stretching. We find a dispersion before correction 0.54 magnitude, that is to say the same order of magnitude as in the filter B.

Figure 10.11: In top, on the left, the Diagram of Hubble in the filter U for a batch of 15 supernovæ. The magnitudes are not corrected for the color nor for the factor of stretching. In bottom, on the left residuals with the diagram of Hubble in a number of $\sigma$ according to the redshift. In top on the right, the histogram of the residuals in magnitudes. In bottom, on the right, the sweater of the residuals.