The Global Magneto-ionic Medium Survey: A Faraday Depth Survey of the Northern Sky Covering 1280–1750 MHz
文献类型：期刊论文
| 作者 | Wolleben,M.8,9; Landecker,T. L.8; Douglas,K. A.8,10,11; Gray,A. D.8; Ordog,A.8,10,12; Dickey,J. M.13; Hill,A. S.8,12; Carretti,E.14; Brown,J. C.10; Gaensler,B. M.15 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2021-06-29 |
| 卷号 | 162期号:1 |
| 关键词 | Polarimetry Polarimeters Spectropolarimetry Radio telescopes Calibration Interstellar magnetic fields Milky Way magnetic fields |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/abf7c1 |
| 英文摘要 | Abstract The Galactic interstellar medium hosts a significant magnetic field, which can be probed through the synchrotron emission produced from its interaction with relativistic electrons. Linearly polarized synchrotron emission is generated throughout the Galaxy and, at longer wavelengths, modified along nearly every path by Faraday rotation in the intervening magneto-ionic medium. Full characterization of the polarized emission requires wideband observations with many frequency channels. We have surveyed polarized radio emission from the Northern sky over the range 1280–1750 MHz, with channel width 236.8 kHz, using the John A. Galt Telescope (diameter 25.6 m) at the Dominion Radio Astrophysical Observatory, as part of the Global Magneto-Ionic Medium Survey. The survey covered 72% of the sky, decl. ?30° to +87° at all R.A. The intensity scale was absolutely calibrated, based on the flux density and spectral index of Cygnus A. Polarization angle was calibrated using the extended polarized emission of the Fan Region. Data are presented as brightness temperatures with angular resolution 40′. Sensitivity in Stokes Q and U is 45 mK rms in a 1.18 MHz band. We have applied rotation measure synthesis to the data to obtain a Faraday depth cube of resolution 150 rad m?2 and sensitivity 3 mK rms of polarized intensity. Features in Faraday depth up to a width of 110 rad m?2 are represented. The maximum detectable Faraday depth is ±2 × 104 rad m?2. The survey data are available at the Canadian Astronomy Data Centre. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-6256-162-1-ABF7C1 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/57047]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Landecker,T. L. |
| 作者单位 | 1.Max-Planck-Institut für Radioastronomie, D-53121 Bonn, Auf dem Hügel 69, Germany 2.CSIRO Astronomy & Space Science, P.O. Box 1130, Bentley, WA 6102, Australia 3.Department of Physics, University of Western Cape, Republic of South Africa 4.Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK 5.Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, ACT 2611, Australia 6.CSIRO Astronomy & Space Science, P.O. Box 76, Epping, NSW 1710, Australia 7.Department of Astronomy, University of Cape Town, Rondenbosch 7701, Republic of South Africa 8.National Research Council Canada, Herzberg Research Centre for Astronomy and Astrophysics, Dominion Radio Astrophysical Observatory, P.O. Box 248, Penticton, BC V2A 6J9, Canada; tom.landecker.drao@gmail.com 9.Skaha Remote Sensing Ltd., 3165 Juniper Drive, Naramata, BC V0H 1N0, Canada 10.Department of Physics and Astronomy, University of Calgary, 2500 University Drive, Calgary, AB T2N 1N4, Canada |
| 推荐引用方式 GB/T 7714 | Wolleben,M.,Landecker,T. L.,Douglas,K. A.,et al. The Global Magneto-ionic Medium Survey: A Faraday Depth Survey of the Northern Sky Covering 1280–1750 MHz[J]. The Astronomical Journal,2021,162(1). |
| APA | Wolleben,M..,Landecker,T. L..,Douglas,K. A..,Gray,A. D..,Ordog,A..,...&West,J. L..(2021).The Global Magneto-ionic Medium Survey: A Faraday Depth Survey of the Northern Sky Covering 1280–1750 MHz.The Astronomical Journal,162(1). |
| MLA | Wolleben,M.,et al."The Global Magneto-ionic Medium Survey: A Faraday Depth Survey of the Northern Sky Covering 1280–1750 MHz".The Astronomical Journal 162.1(2021). |
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来源：国家天文台
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