Peculiar velocities of SNe Ia in clusters of galaxies

The study of the accelerating expansion of the Universe is possible because of the standardization procedure of Type IaSupernovae (SNe). However, we still observe the residual dispersion on the Hubble diagram that could be related toenvironmental effects and unknown peculiar velocities of SNe Ia. In this analysis, we continue to study the peculiar velocitiesof SNe inside galaxy clusters and their influence on distance modulus measurements. We perform the fit for a low redshiftz ≤ 0.15 sample with a fixed value of Ω m for C11 and G10 models and calculate wRM S value to estimate the impactof peculiar velocity effect. We get the wRM S = 0.1643 for the C11 sample with SNe Ia in clusters if we use the galaxycluster z cl instead of the host galaxy z host , wRM S = 0.1696 in the original data (for G10 wRM S = 0.1617 and wRM S =0.1643, respectively). The results show the decreasing of residual dispersion on the Hubble diagram. Therefore, this effectis considerable for supernovae in clusters and should be taken into account in future cosmological analyses.