ramses-rt: radiation hydrodynamics in the cosmological context

By J. Rosdahl, Jérémy Blaizot, Dominique Aubert, Timothy Stranex, Romain Teyssier. Monthly notices of the Royal Astronomical Society, 2013

178 citations recorded by the source corpus.

We present a new implementation of radiation hydrodynamics (RHD) in the adaptive mesh refinement (AMR) code RAMSES. The multi-group radiative transfer (RT) is performed on the AMR grid with a first-order Godunov method using the M1 closure for the Eddington tensor, and is coupled to the hydrodynamics via non-equilibrium thermochemistry of hydrogen and helium. This moment-based approach has the large advantage that the computational cost is independent of the number of radiative sources - it can even deal with continuous regions of emission such as bound-free emission from gas. As it is built directly into RAMSES, the RT takes natural advantage of the refinement and parallelization strategies already in place. Since we use an explicit advection solver for the radiative transport, the time step is restricted by the speed of light - a severe limitation that can be alleviated using the so--called "reduced speed of light" approximation. We propose a rigorous framework to assess the validity of this approximation in various conditions encountered in cosmology and galaxy formation. We finally perform with our newly developed code a complete suite of RHD tests, comparing our results to other RHD codes. The tests demonstrate that our code performs very well and is ideally suited for exploring the effect of radiation on current scenarios of structure and galaxy formation.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/702b3c40dab363388923fb02649a685e10dc5b86

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In Astronomy and Astrophysics

1. J. Devriendt
2. T. Kimm
3. A. Slyz
4. J. Rosdahl
5. Jérémy Blaizot
6. Renyue Cen
7. Romain Teyssier
8. L. Hernquist

Citations in the corpus

• ESCAPE FRACTION OF IONIZING PHOTONS DURING REIONIZATION: EFFECTS DUE TO SUPERNOVA FEEDBACK AND RUNAWAY OB STARS (2014, methodology): “…escape of ionizing photons and quantifyfesc, we have carried out two zoomed-in cosmological radiation hydrodynamics simulations of 3.8× 4.8× 9.6 Mpc3 box (comoving) with the RAMSES code (Teyssier 2002; Rosdahl et al. 2013) with high spatial (∼ 4 pc, physical) and stellar mass resolution of 49 M⊙.”
• The SPHINX Cosmological Simulations of the First Billion Years: the Impact of Binary Stars on Reionization★ (2018, methodology): “…hydrogen and helium thermochemistry, coupled with the local ionizing radiation, is performed with the quasiimplicit method described in Rosdahl et al. (2013) via photoionization, collisional ionization, collisional excitation, recombination, bremsstrahlung, homogeneous Compton…”
• Feedback-regulated star formation and escape of LyC photons from mini-haloes during reionization (2016, methodology): “We use RAMSES-RT, a radiation hydrodynamics code with adaptive mesh refinement, (Teyssier 2002; Rosdahl et al. 2013; Rosdahl & Teyssier 2015), to study reionisation due to starlight in mini-haloes with 106 <∼Mhalo/M <∼ 10 8.”
• Fluctuating feedback-regulated escape fraction of ionizing radiation in low-mass, high-redshift galaxies (2017, methodology): “…of the halo, and may also give imperfect estimates as the moments method we use for the radiative hydrodynamics is known for being too diffusive (Iliev et al. 2006, 2009; Rosdahl et al. 2013), leading to spurious leakage of radiation around opaque obstacles that should in principle cast a shadow.”
• Cosmic Dawn (CoDa): the first radiation-hydrodynamics simulation of reionization and galaxy formation in the Local Universe (2015, methodology): “RAMSES-RT has been extensively tested and passes the test suite of Iliev et al. (2009).”