Galactic synchrotron emissivity measurements between 250 degrees < l < 355 degrees from the GLEAM survey with the MWA
文献类型：期刊论文
| 作者 | Dwarkanath, K. S.3; Callingham, J. R.4,7,8; Bell, M. E.4,7; Lenc, E.7,8; Johnston-Hollitt, M.9; Morgan, J.13; Staveley-Smith, L.5,7; Gaensler, B. M.6,7,8; Wayth, R. B.13; Su, H.13,14,15 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2017-03-01 |
| 卷号 | 465期号:3页码:3163-3174 |
| 关键词 | Cosmic Rays h Ii Regions Galaxy: Structure Radio Continuum: General |
| DOI | 10.1093/mnras/stw2959 |
| 文献子类 | Article |
| 英文摘要 | 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), we measure the free-free absorption of this Galactic synchrotron emission by intervening HII regions along the line of sight. These absorption measurements allow us to calculate the Galactic cosmic ray electron emissivity behind and in front of 47 detected HII regions in the region 250 degrees < l < 355 degrees, | b| < 2 degrees. We find that all average emissivities between the HII regions and the Galactic edge along the line of sight ( is an element of(b)) are in the range of 0.39 similar to 1.45 K pc(- 1) with a mean of 0.77 K pc(- 1) and a variance of 0.14 K pc(- 1) at 88 MHz. Our best model, the two- circle model, divides the Galactic disc into three regions using two circles centring on the Galactic Centre. It shows a high emissivity region near the Galactic Centre, a low emissivity region near the Galactic edge, and a medium emissivity region between these two regions, contrary to the trend found by previous studies. |
| WOS关键词 | MOLONGLO REFERENCE CATALOG ; MILKY-WAY ; RADIO-EMISSION ; MAGNETIC-FIELD ; 10 MHZ ; RADIATION ; REGIONS ; GALAXY ; DISK ; POLARIZATION |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000395165900045 |
| 资助机构 | Western Australian Government ; Western Australian Government ; Australian Government ; Australian Government ; NSFC(11473038 ; NSFC(11473038 ; Department of Science, Office of Premier Cabinet, WA ; Department of Science, Office of Premier Cabinet, WA ; 11273025) ; 11273025) ; Western Australian Government ; Western Australian Government ; Australian Government ; Australian Government ; NSFC(11473038 ; NSFC(11473038 ; Department of Science, Office of Premier Cabinet, WA ; Department of Science, Office of Premier Cabinet, WA ; 11273025) ; 11273025) |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8888]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Netherlands Inst Radio Astron, ASTRON, Postbus 2, NL-7990 AA Dwingeloo, Netherlands 2.Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia 3.Raman Res Inst, Bangalore 560080, Karnataka, India 4.CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia 5.ICRAR Univ Western Australia, Nedlands, WA 6009, Australia 6.Univ Toronto, Dunlap Inst Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada 7.ARC Ctr Excellence All sky Astrophys CAASTRO, Sydney, NSW, Australia 8.Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia 9.Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand 10.Univ Hertfordshire, Sch Phys Astron & Math, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England |
| 推荐引用方式 GB/T 7714 | Dwarkanath, K. S.,Callingham, J. R.,Bell, M. E.,et al. Galactic synchrotron emissivity measurements between 250 degrees < l < 355 degrees from the GLEAM survey with the MWA[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,465(3):3163-3174. |
| APA | Dwarkanath, K. S..,Callingham, J. R..,Bell, M. E..,Lenc, E..,Johnston-Hollitt, M..,...&McClure-Griffiths, N. M..(2017).Galactic synchrotron emissivity measurements between 250 degrees < l < 355 degrees from the GLEAM survey with the MWA.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,465(3),3163-3174. |
| MLA | Dwarkanath, K. S.,et al."Galactic synchrotron emissivity measurements between 250 degrees < l < 355 degrees from the GLEAM survey with the MWA".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 465.3(2017):3163-3174. |
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