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[ascl:2312.022] C2-Ray: Time-dependent photo-ionization calculations

C2-Ray calculates spherical symmetric time-dependent photo-ionization in 1D with the source at the origin for hydrogen only. The code is explicitly photon-conserving and uses an analytical relaxation solution for the ionization rate equations for each time step, thus enabling integration of the equation of transfer along a ray with fewer cells and time steps than previous methods. It is suitable for coupling radiative transfer to gas and N-body dynamics methods on fixed or adaptive grids. C2-Ray is not parallelized but contains an MPI module for compatibility with the 3D version (C2-Ray3Dm).

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