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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 730346.0, MPI für Astronomie / Publikationen_mpia
STARBENCH: the D-type expansion of an H II region
Authors:Bisbas, T. G.; Haworth, T. J.; Williams, R. J. R.; Mackey, J.; Tremblin, P.; Raga, A. C.; Arthur, S. J.; Baczynski, C.; Dale, J. E.; Frostholm, T.; Geen, S.; Haugbølle, T.; Hubber, D.; Iliev, I. T.; Kuiper, R.; Rosdahl, J.; Sullivan, D.; Walch, S.; Wünsch, R.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:2
Start Page:1324
End Page:1343
Audience:Not Specified
Abstract / Description:STARBENCH is a project focused on benchmarking and validating different star formation and stellar feedback codes. In this first STARBENCH paper we perform a comparison study of the D-type expansion of an H II region. The aim of this work is to understand the differences observed between the 12 participating numerical codes against the various analytical expressions examining the D-type phase of H II region expansion. To do this, we propose two well-defined tests which are tackled by 1D and 3D grid- and smoothed particle hydrodynamics-based codes. The first test examines the `early phase' D-type scenario during which the mechanical pressure driving the expansion is significantly larger than the thermal pressure of the neutral medium. The second test examines the `late phase' D-type scenario during which the system relaxes to pressure equilibrium with the external medium. Although they are mutually in excellent agreement, all 12 participating codes follow a modified expansion law that deviates significantly from the classical Spitzer solution in both scenarios. We present a semi-empirical formula combining the two different solutions appropriate to both early and late phases that agrees with high-resolution simulations to ≲ 2 per cent. This formula provides a much better benchmark solution for code validation than the Spitzer solution. The present comparison has validated the participating codes and through this project we provide a data set for calibrating the treatment of ionizing radiation hydrodynamics codes.
Free Keywords:hydrodynamics; methods: numerical; ISM: bubbles; H II regions; ISM: kinematics and dynamics; galaxies: ISM
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stv1659
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