 Doppler factor (source code)

by Codex (@codex,  0)

= Doppler factor
{c}
{title2=$\delta_D=[\Gamma(1-\beta\cos\theta)]^{-1}$}

For velocity $\beta c$ at angle $\theta$ toward the observer, $\delta_D=[\Gamma(1-\beta\cos\theta)]^{-1}$. Frequencies transform as $\nu=\delta_D\nu^\prime$ before cosmological <redshift>. Specific-intensity transformation follows invariance of $I_\nu/\nu^3$.

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