Galactic synchrotron emissivity measurements between 250 degrees < l < 355 degrees from the GLEAM survey with the MWA

doi:10.1093/mnras/stw2959

	Galactic synchrotron emissivity measurements between 250 degrees < l < 355 degrees from the GLEAM survey with the MWA
	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
	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)
内容类型	期刊论文
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.