నైరూప్య

Constraining the Hubble parameter using distance modulus-Redshift relation

C.C.Onuchukwu, A.C.Ezeribe

Using the relation between distance modulus (m – M), redshift (z) and deceleration parameter (q0), obtained using Friedman-Robertson-Walker (FRW) metric, we constrain the Hubble parameter (h). Using the mean and the median values of our data obtained from NASA Extragalactic Database (NED), the value of Hubble parameter we estimated is 0.66  0.11 and 0.84  0.11 for q0 = –1 and q0 = 0 respectively. In general, using the minimum and the maximum values of the parameter in our data, the value of Hubble parameter we estimated lies in the range 0.6  0.2  h  2.2  0.7, with an average value of h = 0.67  0.22 – 0.96 0.29, giving an average age for the universe as 11.4  2.4 – 14.3  2.2 Gyr.