I am Hongquan Su, a PhD candidate at ICRAR-Curtin.
Mapping the Galaxy in 3D using observations of HII region absorption with the MWA
Synchrotron emission pervades the Galactic plane at low radio frequencies, originating from cosmic ray electrons interacting with the Galactic magnetic field. Using a low-frequency radio telescope, the Murchison Widefield Array (MWA), I measure the free-free absorption of this Galactic synchrotron emission by intervening HII regions along the line of sight. These absorption measurements allow me to calculate the Galactic cosmic-ray electron emissivity behind and in front of HII regions. This will enable testing of the spatial distribution of cosmic-ray electrons with a known Galactic magnetic field.
The initial measurements have been reported:
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