Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey
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...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Oxford University Press
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/73228 |
| _version_ | 1848762959363309568 |
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| author | Su, H. Macquart, Jean-Pierre Hurley-Walker, Natasha McClure-Griffiths, N. Jackson, Carole Tingay, Steven Tian, W. Gaensler, B. McKinley, B. Kapínska, A. Hindson, L. Hancock, Paul Wayth, Randall Staveley-Smith, L. Morgan, John Johnston-Hollitt, M. Lenc, E. Bell, M. Callingham, J. Dwarkanath, K. For, B. Offringa, A. Procopio, P. Wu, C. Zheng, Q. |
| author_facet | Su, H. Macquart, Jean-Pierre Hurley-Walker, Natasha McClure-Griffiths, N. Jackson, Carole Tingay, Steven Tian, W. Gaensler, B. McKinley, B. Kapínska, A. Hindson, L. Hancock, Paul Wayth, Randall Staveley-Smith, L. Morgan, John Johnston-Hollitt, M. Lenc, E. Bell, M. Callingham, J. Dwarkanath, K. For, B. Offringa, A. Procopio, P. Wu, C. Zheng, Q. |
| author_sort | Su, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T10:55:51Z |
| format | Journal Article |
| id | curtin-20.500.11937-73228 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:55:51Z |
| publishDate | 2018 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-732282019-02-14T06:52:30Z Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey Su, H. Macquart, Jean-Pierre Hurley-Walker, Natasha McClure-Griffiths, N. Jackson, Carole Tingay, Steven Tian, W. Gaensler, B. McKinley, B. Kapínska, A. Hindson, L. Hancock, Paul Wayth, Randall Staveley-Smith, L. Morgan, John Johnston-Hollitt, M. Lenc, E. Bell, M. Callingham, J. Dwarkanath, K. For, B. Offringa, A. Procopio, P. Wu, C. Zheng, Q. 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. 2018 Journal Article http://hdl.handle.net/20.500.11937/73228 10.1093/mnras/sty1732 Oxford University Press fulltext |
| spellingShingle | Su, H. Macquart, Jean-Pierre Hurley-Walker, Natasha McClure-Griffiths, N. Jackson, Carole Tingay, Steven Tian, W. Gaensler, B. McKinley, B. Kapínska, A. Hindson, L. Hancock, Paul Wayth, Randall Staveley-Smith, L. Morgan, John Johnston-Hollitt, M. Lenc, E. Bell, M. Callingham, J. Dwarkanath, K. For, B. Offringa, A. Procopio, P. Wu, C. Zheng, Q. Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey |
| title | Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey |
| title_full | Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey |
| title_fullStr | Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey |
| title_full_unstemmed | Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey |
| title_short | Galactic synchrotron distribution derived from 152 HII region absorption features in the full GLEAM survey |
| title_sort | galactic synchrotron distribution derived from 152 hii region absorption features in the full gleam survey |
| url | http://hdl.handle.net/20.500.11937/73228 |