Magnetohydrodynamic evolution of H II regions in molecular clouds: Simulation methodology, tests, and uniform media

Mark R. Krumholz, James M. Stone, Thomas A. Gardiner

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

We present a method for simulating the evolution of H n regions driven by point sources of ionizing radiation in magnetohydrodynamic media, implemented in the three-dimensional Athena MHD code. We compare simulations using our algorithm to analytic solutions and show that the method passes rigorous tests of accuracy and convergence. The tests reveal several conditions that an ionizing radiation hydrodynamic code must satisfy to reproduce analytic solutions. As a demonstration of our new method, we present the first three-dimensional, global simulation of an H n region expanding into a magnetized gas. The simulation shows that magnetic fields suppress sweeping up of gas perpendicular to magnetic field lines, leading to small density contrasts and extremely weak shocks at the leading edge of the H II region's expanding shell.

Original languageEnglish (US)
Pages (from-to)518-535
Number of pages18
JournalAstrophysical Journal
Volume671
Issue number1
DOIs
StatePublished - Dec 10 2007

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • H II regions
  • ISM: kinematics and dynamics
  • Instabilities
  • MHD
  • Methods: numerical
  • Radiative transfer

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