Ionization of the warm (magneto)ionized medium

Alex Hill (Dominion Radio Astrophysical Observatory, UBC Physics & Astronomy)
Event Date and Time: 
Mon, 2018-01-22 15:00 - 16:15
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
The ionization of the warm ionized medium has been a puzzle since its discovery in the 1970s. Observations suggest a power requirement that can only be explained with photoionization by O stars in the Galactic disk. I will discuss the success of models invoking supernova-driven turbulence to allow ionizing photons to travel from massive stars in the Galactic midplane to more than a kpc above the disk as part of the multi-phase interstellar medium. I will present Global Magnetoionic Medium Survey (GMIMS) observations obtained with the John A. Galt 26-m Telescope at DRAO of the Fan Region. This very large (30° by 60°) feature dominates the sky in polarized continuum radio emission. I will argue that the Fan Region is a Galactic-scale structure tracing the Galactic magnetic field. I will also discuss our planned use of Canadian Hydrogen Intensity Mapping Experiment (CHIME) data as a low-frequency counterpart to the 26 m GMIMS data.
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