Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725106h&link_type=abstract
American Astronomical Society, AAS Meeting #217, #251.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new 3D MHD simulations of a supernova-driven, stratified interstellar medium. We have previously shown that the density distribution arising from hydrodynamical versions of these simulations creates low-density pathways through which Lyman continuum photons can travel to heights |z| > 1 kpc. This naturally produces the warm ionized medium through photoionization due primarily to O stars near the plane. However, the hydrodynamical models reproduce the peak but not the width of the emission measure distribution observed in Wisconsin H-Alpha Mapper (WHAM) data. Here, we discuss the role of magnetic fields in the structure of gas away from the plane. We compare emission measure distributions from models with varying magnetic field strengths to the WHAM observations.
The simulations were performed using the adaptive mesh refinement grid code FLASH with the new MHD solver developed by Waagan et al.
This work was partly supported by NASA/SAO grant TM0-11008X and by NSF grant AST-0607512.
Benjamin Robert A.
Haffner Matthew L.
Hill Alex S.
Joung Ryan M.
Klingenberg Christian
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