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Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey

Su, Hongquan; Macquart, J. P.; Hurley-Walker, Natasha; McClure-Griffiths, Naomi; Jackson, Carole A.; Tingay, S. J.; Tian, Wenwu; Gaensler, B. M.; McKinley, McKinley; Kapinska, Anna D.; Hindson, Luke


We derive the synchrotron distribution in the Milky Way disc from H II region absorption observations over -40° < l < 40° at six frequencies of 76.2, 83.8, 91.5, 99.2, 106.9, and 114.6 MHz with the GaLactic and Extragalactic All-sky Murchison widefield array survey (GLEAM). We develop a new method of emissivity calculation by taking advantage of the Haslam et al. (1981) map and known spectral indices, which enable us to simultaneously derive the emissivity and the optical depth of H II regions...[Show more]

CollectionsANU Research Publications
Date published: 2018-04-30
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/sty1732
Access Rights: Open Access


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