Abstract
The present authors have explored Dynamic Multiple Scattering (DMS) theory for explaining the shift as well as spectral line broadening, based on Wolf's idea of induced correlation mechanism of the spectral lines. Our recent work, based on the statistical analysis of the Véron-Cetty data (2006) and SDSDD (DR3) data support supports that quasar redshifts fit the overall Hubble expansion law, as in the case of galaxies, for z ⩽ 0.295 but not for higher redshifts, indicating clearly the inadequacy of the Doppler effect as the sole mechanism in explaining the redshifts for high redshift quasars (z ⩾ 0.295). We found that the redshift possess an additive, “discordant” component of the frequency shifting due to this correlation induced mechanism (DMS) which becomes more effective for ∼ 0.295 ⩽ z ⩽ 3.0. The recent observational data on redshift z versus apparent magnitude (m) (Hubble diagram) are found to be in good agreement for suitable range of values of the induced correlation parameters. Our analysis emphasize on the importance of the local effects i.e., of the environmental aspects of relevance (recent observations of molecular gases, the plasma like environment with spatial and temporal variations of the density, temperature and ionization content of the medium) around quasars, especially, for the higher redshifts (z ⩾ 0.3) limits.