Pulsars, transients and relativistic astrophysics

Abstract:

Abstract.Using a new radio sample, 6C* designed to find radio galaxies at z > 4 along with the complete 3CRR and 6CE sample we extend the radio galaxy K-z relation to $$z \sim 4.5$$. The 6C* K-z data significantly improve delineation of the K-z relation for radio galaxies at high redshift (z > 2). In a spatially flat universe with a cosmological constant ( $$\rm\Omega_{\rm M}=0.3$$ and $$\rm\Omega_{\Lambda}=0.7$$), the most luminous radio sources appear to be associated with galaxies with a luminosity distribution with a high mean ( $$\approx 5L^{*}$$), and a low dispersion ( $$\sigma \sim 0.5$$ mag) which formed their stars at epochs corresponding to $$z\gtrsim 2.5$$).

Abstract:

Using a new radio sample, 6C* designed to find radio galaxies at z > 4 along with the complete 3CRR and 6CE sample we extend the radio galaxy K - z relation to z similar to 4.5. The 6C* K - z data significantly improve delineation of the K - z relation for radio galaxies at high redshift (z > 2). In a spatially flat universe with a cosmological constant (Omega(M) = 0.3 and Omega(A) = 0.7), the most luminous radio sources appear to be associated with galaxies with a luminosity distribution with a high mean (approximate to 5L*), and a low dispersion (sigma similar to 0.5 mag) which formed their stars at epochs corresponding to z greater than or similar to 2.5).