Techniques for Accurate Parallax Measurements for 6.7 GHz Methanol Masers | |
Reid, M. J.1; Brunthaler, A.2; Menten, K. M.2; Sanna, A.2; Xu, Y.3; Li, J. J.4; Wu, Y.4; Hu, B.4; Zheng, X. W.5; Zhang, B.6 | |
刊名 | ASTRONOMICAL JOURNAL |
2017-08-01 | |
卷号 | 154期号:2页码:5 |
关键词 | astrometry atmospheric effects methods: data analysis parallaxes techniques: interferometric |
ISSN号 | 0004-6256 |
DOI | 10.3847/1538-3881/aa7850 |
英文摘要 | The BeSSeL Survey is mapping the spiral structure of the Milky Way by measuring trigonometric parallaxes of hundreds of maser sources associated with high-mass star formation. While parallax techniques for water masers at high frequency (22 GHz) have been well documented, recent observations of methanol masers at lower frequency (6.7 GHz) have revealed astrometric issues associated with signal propagation through the ionosphere that could significantly limit parallax accuracy. These problems displayed as a "parallax gradient" on the sky when measured against different background quasars. We present an analysis method in which we generate position data relative to an "artificial quasar" at the target maser position at each epoch. Fitting parallax to these data can significantly mitigate the problems and improve parallax accuracy. |
WOS关键词 | ASTROMETRY |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000406013500006 |
内容类型 | 期刊论文 |
源URL | [http://libir.pmo.ac.cn/handle/332002/22880] |
专题 | 中国科学院紫金山天文台 |
通讯作者 | Reid, M. J. |
作者单位 | 1.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 2.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 3.Natl Astron Observ Japan, Mizusawa VLBI Observ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 5.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China 6.Shanghai Astrophys Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 7.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 8.INAF Ist Radioastron, Italian ALMA Reg Ctr, Via P Gobetti 101, I-40129 Bologna, Italy 9.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy 10.Nicolaus Copernicus Univ, Ctr Astron, Fac Phys Astron & Informat, Grudziadzka 5, PL-87100 Torun, Poland |
推荐引用方式 GB/T 7714 | Reid, M. J.,Brunthaler, A.,Menten, K. M.,et al. Techniques for Accurate Parallax Measurements for 6.7 GHz Methanol Masers[J]. ASTRONOMICAL JOURNAL,2017,154(2):5. |
APA | Reid, M. J..,Brunthaler, A..,Menten, K. M..,Sanna, A..,Xu, Y..,...&Choi, Y. K..(2017).Techniques for Accurate Parallax Measurements for 6.7 GHz Methanol Masers.ASTRONOMICAL JOURNAL,154(2),5. |
MLA | Reid, M. J.,et al."Techniques for Accurate Parallax Measurements for 6.7 GHz Methanol Masers".ASTRONOMICAL JOURNAL 154.2(2017):5. |
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