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

Su, H; Macquart, JP; Hurley-Walker, N; McClure-Griffiths, NM; Jackson, CA; Tingay, SJ; Tian, WW; Gaensler, BM; McKinley, B; Kapínska, AD; Hindson, L; Hancock, P; Wayth, RB; Staveley-Smith, L; Morgan, J; Johnston-Hollitt, M; Lenc, E; Bell, ME; Callingham, JR; Dwarkanath, KS; For, BQ; Offringa, AR; Procopio, P; Wu, C; Zheng, Q

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

Su, H Macquart, JP Hurley-Walker, N McClure-Griffiths, NM Jackson, CA Tingay, SJ Tian, WW Gaensler, BM McKinley, B Kapínska, AD Hindson, L Hancock, P Wayth, RB Staveley-Smith, L Morgan, J Johnston-Hollitt, M Lenc, E Bell, ME

Callingham, JR Dwarkanath, KS For, BQ Offringa, AR Procopio, P Wu, C Zheng, Q

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Publication Type:: Journal Article
Citation:: Monthly Notices of the Royal Astronomical Society, 2018, 479 (3), pp. 4041 - 4055
Issue Date:: 2018-09-21

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Field	Value	Language
dc.contributor.author	Su, H	en_US
dc.contributor.author	Macquart, JP	en_US
dc.contributor.author	Hurley-Walker, N	en_US
dc.contributor.author	McClure-Griffiths, NM	en_US
dc.contributor.author	Jackson, CA	en_US
dc.contributor.author	Tingay, SJ	en_US
dc.contributor.author	Tian, WW	en_US
dc.contributor.author	Gaensler, BM	en_US
dc.contributor.author	McKinley, B	en_US
dc.contributor.author	Kapínska, AD	en_US
dc.contributor.author	Hindson, L	en_US
dc.contributor.author	Hancock, P	en_US
dc.contributor.author	Wayth, RB	en_US
dc.contributor.author	Staveley-Smith, L	en_US
dc.contributor.author	Morgan, J	en_US
dc.contributor.author	Johnston-Hollitt, M	en_US
dc.contributor.author	Lenc, E	en_US
dc.contributor.author	Bell, ME https://orcid.org/0000-0003-1767-5277	en_US
dc.contributor.author	Callingham, JR	en_US
dc.contributor.author	Dwarkanath, KS	en_US
dc.contributor.author	For, BQ	en_US
dc.contributor.author	Offringa, AR	en_US
dc.contributor.author	Procopio, P	en_US
dc.contributor.author	Wu, C	en_US
dc.contributor.author	Zheng, Q	en_US
dc.date.issued	2018-09-21	en_US
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2018, 479 (3), pp. 4041 - 4055	en_US
dc.identifier.issn	0035-8711	en_US
dc.identifier.uri	http://hdl.handle.net/10453/130481
dc.description.abstract	© 2018 The Author(s) Published by Oxford University Press on behalf of The Royal Astronomical Society. 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 at each frequency. We show our derived synchrotron emissivities based on 152 absorption features of H II regions using both the method previously adopted in the literature and our improved method. We derive the synchrotron emissivity from H II regions to the Galactic edge along the line of sight and, for the first time, derive the emissivity from H II regions to the Sun. These results provide direct information on the distribution of the Galactic magnetic field and cosmic ray electrons for future modelling.	en_US
dc.relation.ispartof	Monthly Notices of the Royal Astronomical Society	en_US
dc.relation.isbasedon	10.1093/mnras/sty1732	en_US
dc.subject.classification	Astronomy & Astrophysics	en_US
dc.title	Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	479	en_US
utslib.for	0201 Astronomical and Space Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	479	en_US

Abstract:

© 2018 The Author(s) Published by Oxford University Press on behalf of The Royal Astronomical Society. 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 at each frequency. We show our derived synchrotron emissivities based on 152 absorption features of H II regions using both the method previously adopted in the literature and our improved method. We derive the synchrotron emissivity from H II regions to the Galactic edge along the line of sight and, for the first time, derive the emissivity from H II regions to the Sun. These results provide direct information on the distribution of the Galactic magnetic field and cosmic ray electrons for future modelling.

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http://hdl.handle.net/10453/130481