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; Immer, K.7; Rygl, K.8; Moscadelli, L.9; Sakai, N.3; Bartkiewicz, A.10; Choi, Y. K.11

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.

Keywordastrometry atmospheric effects methods: data analysis parallaxes techniques: interferometric
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000406013500006
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Document Type期刊论文
Corresponding AuthorReid, M. J.
Affiliation1.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
11.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
Recommended Citation
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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