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Galactic synchrotron emissivity measurements between 250 degrees < l < 355 degrees from the GLEAM survey with the MWA
作者: Su, H.1,2,3; Hurley-Walker, N.3; Jackson, C. A.3; McClure-Griffiths, N. M.4; Tingay, S. J.3,5; Hindson, L.6,7; Hancock, P.3; Wayth, R. B.3; Gaensler, B. M.8,9,10; Staveley-Smith, L.9,11; Morgan, J.3; Johnston-Hollitt, M.7; Lenc, E.8,9; Bell, M. E.9,12; Callingham, J. R.8,9,12; Dwarkanath, K. S.13; For, B. -Q.; Kapinska, A. D.9,11; McKinley, B.14; Offringa, A. R.15; Procopio, P.14; Wu Cao(吴潮)11; Zheng, Q.7
关键词: cosmic rays ; H II regions ; Galaxy: structure ; radio continuum: general
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
发表日期: 2017-03-01
DOI: 10.1093/mnras/stw2959
卷: 465, 期:3, 页:3163-3174
文章类型: Article
收录类别: SCI
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: MOLONGLO REFERENCE CATALOG ; MILKY-WAY ; RADIO-EMISSION ; MAGNETIC-FIELD ; 10 MHZ ; RADIATION ; REGIONS ; GALAXY ; DISK ; POLARIZATION
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.
语种: 英语
项目资助者: Western Australian Government ; Australian Government ; NSFC(11473038 ; Department of Science, Office of Premier Cabinet, WA ; 11273025)
WOS记录号: WOS:000395165900045
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内容类型: 期刊论文
URI标识: http://ir.bao.ac.cn/handle/114a11/8888
Appears in Collections:太阳物理研究部_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observatories, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia
4.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
5.Ist Nazl Astrofis, Ist Radio Astron, I-40123 Bologna, Italy
6.Univ Hertfordshire, Sch Phys Astron & Math, Ctr Astrophys Res, Coll Lane, Hatfield AL10 9AB, Herts, England
7.Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand
8.Sydney Inst Astron, Sch Phys, Sydney, NSW 2006, Australia
9.ARC Ctr Excellence All sky Astrophys CAASTRO, Sydney, NSW, Australia
10.Univ Toronto, Dunlap Inst Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada
11.ICRAR Univ Western Australia, Nedlands, WA 6009, Australia
12.CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia
13.Raman Res Inst, Bangalore 560080, Karnataka, India
14.Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia
15.Netherlands Inst Radio Astron, ASTRON, Postbus 2, NL-7990 AA Dwingeloo, Netherlands

Recommended Citation:
Su, H.,Hurley-Walker, N.,Jackson, C. A.,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.
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