Impact of the ERF on the structure and evolution of SNRs

0549018 - ASÚ 2022 RIV GB eng J - Journal Article
Romero, M. - Ascasibar, E. - Palouš, Jan - Wünsch, Richard - Mollá, M.
Impact of the ERF on the structure and evolution of SNRs.
Monthly Notices of the Royal Astronomical Society. Roč. 55, č. 4 (2021), s. 5301-5310. ISSN 0035-8711. E-ISSN 1365-2966
R&D Projects: GA ČR(CZ) GA19-15480S
Institutional support: RVO:67985815
Keywords : radiation mechanisms * numerical methods * supernova remnants
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.235, year: 2021
Method of publishing: Limited access
https://doi.org/10.1093/mnras/stab1660

We carry out 1D hydrodynamical simulations of the evolution of a spherically symmetric supernova remnant (SNR) subject to an external radiation field (ERF) that influences the cooling and heating rates of the gas. We consider homogeneous media with ambient hydrogen number densities n(H), 0 of 0.1 and 1 cm(-3) permeated by an average radiation field including the cosmic microwave, extragalactic, and Galactic backgrounds, attenuated by an effective column density N-H,N-eff from 10(18) to 10(21) cm(-2). Our results may be classified into two broad categories: at low N-H,N-eff, the ERF presents little absorption in the ultraviolet (ionizing) regime, and all the 'unshielded' cases feature an equilibrium temperature T-eq similar to 7000 K below which the ambient gas cannot cool further. In this scenario, the SNR develops a nearly isothermal shock profile whose shell becomes thicker over time. At higher N-H,N-eff, the ERF is heavily absorbed in the UV range, yielding a roughly constant heating function for temperatures less than or similar to 10(4) K. These 'shielded' cases develop a thin, cold and dense shell throughout their evolution. Energy and momentum injection to the medium do not change significantly between both scenarios, albeit luminosity is higher and more uniformly distributed over the shell for unshielded SNR.
Permanent Link: http://hdl.handle.net/11104/0325053