RASCAS: RAdiation SCattering in Astrophysical Simulations

Understand

Resonant lines are powerful probes of the interstellar and circumgalactic medium of galaxies.

• Their transfer in gas being a complex process, the interpretation of their observational signatures, either in absorption or in emission, is often not straightforward.
• Numerical radiative transfer simulations are needed to accurately describe the travel of resonant line photons in real and in frequency space, and to produce realistic mock observations.
• This paper introduces RASCAS, a new public 3D radiative transfer code developed to perform the propagation of any resonant line in numerical simulations of astrophysical objects.