Tree-based solvers for adaptive mesh refinement code FLASH - IV. An X-ray radiation scheme to couple discrete and diffuse X-ray emission sources to the thermochemistry of the interstellar medium

0573377 - ASÚ 2024 RIV US eng J - Článek v odborném periodiku
Gaches, B. A. L. - Walch, S. - Wünsch, Richard - Mackey, J.
Tree-based solvers for adaptive mesh refinement code FLASH - IV. An X-ray radiation scheme to couple discrete and diffuse X-ray emission sources to the thermochemistry of the interstellar medium.
Monthly Notices of the Royal Astronomical Society. Roč. 522, č. 3 (2023), s. 4674-4690. ISSN 0035-8711. E-ISSN 1365-2966
Grant CEP: GA ČR(CZ) GA20-19854S
Institucionální podpora: RVO:67985815
Klíčová slova: astrochemistry * radiative transfer * numerical methods
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 4.8, rok: 2022
Způsob publikování: Open access

X-ray radiation, in particular radiation between 0.1 and 10 keV, is evident from both point-like sources, such as compact objects and T-Tauri young stellar objects, and extended emission from hot, cooling gas, such as in supernova remnants. The X-ray radiation is absorbed by nearby gas, providing a source of both heating and ionization. While protoplanetary chemistry models now often include X-ray emission from the central young stellar object, simulations of star-forming regions have yet to include X-ray emission coupled to the chemo-dynamical evolution of the gas. We present an extension of the treeray reverse ray trace algorithm implemented in the flash magnetohydrodynamic code which enables the inclusion of X-ray radiation from 0.1 keV < E-gamma < 100 keV, dubbed xraythespot. xraythespot allows for the use of an arbitrary number of bins, minimum and maximum energies, and both temperature-independent and temperature-dependent user-defined cross-sections, along with the ability to include both point and extended diffuse emission and is coupled to the thermochemical evolution. We demonstrate the method with several multibin benchmarks testing the radiation transfer solution and coupling to the thermochemistry. Finally, we show two example star formation science cases for this module: X-ray emission from protostellar accretion irradiating an accretion disc and simulations of molecular clouds with active chemistry, radiation pressure, and protostellar radiation feedback from infrared to X-ray radiation.
Trvalý link: https://hdl.handle.net/11104/0343841