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Mapping our Milky Way with Methanol Masers

Mapping our Milky Way with Methanol Masers. Xingwu Zheng Astronomy Department,Nanjing University,China. Collaborator: M. J. Reid (CFA, US) , K. M. Menten (MPIR, Germany) Brunthaler (MPIR, Germany), L. Moscadelli (Italy) Y. Xu (PMO, China), B. Zhang (NJU, China)

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Mapping our Milky Way with Methanol Masers

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  1. Mapping our Milky Way with Methanol Masers Xingwu Zheng Astronomy Department,Nanjing University,China Collaborator: M. J. Reid (CFA, US) , K. M. Menten (MPIR, Germany) Brunthaler (MPIR, Germany), L. Moscadelli (Italy) Y. Xu (PMO, China), B. Zhang (NJU, China) M. Sato (VERA), M. Honma (VERA), T. Hirota (VERA) K. Hachsuka (SHAO, China), Y. K. Choi (MPIR, Germany) G. A. Moellenbrock (NRAO, US), A. Bartkiewicz (Poland) A. Nakagawa(Japan), Y. Asaki (Japan)

  2. outline • progress of the project • preliminary results • Further work

  3. Radio instruments of mapping the Galactic structure: VLBA (Very large Baseline Arry) VERA (VLBI Exploration Radio Astrometry) VLBA Array beam Astrometry accuracy VERA Array beam Astrometry accuracy Distance measurement 10 kpc (parallax 0.1 mas)

  4. Milky Way Parallaxes Xu, Reid, Zheng & Menten (2006) • W3OH: • = 0.512 mas +/- 0.010 mas

  5. Milky Way Parallaxes Honma et al. (2007) • S269: • = 0.189 mas +/- 0.016 mas

  6. Milky Way Parallaxes • WB89-437: • = 0.167 mas +/- 0.006 mas Hachisuka et al. (2009) • S269: • = 0.189 mas +/- 0.016 mas

  7. Orion Nebular Cluster Parallax D = 414 +/- 7 pc Menten, Reid, Forbrich & Brunthaler (2007)

  8. S Per -34 0.399+/-0.014 -0.38 -1.54 -34 9 S Car 2.33+/-0.13 -1.56 -5.16 34.7 10

  9. Methanol maser parallax measurements with VLBA First phase result: project from 2004 to 2008

  10. CH3OH, SiO and H2O maser parallax with VLBA and VERA

  11. The model Thin disk disk rotation speed

  12. frame system: Cartesian Galactic coordinate

  13. data Model values Least-squarses Fitting

  14. Best fitting: Average motion:

  15. Discrepancy: kinematic distance? ? pecular motion?

  16. Total dynamical mass of the Milky Way The Milky Way may have more mass

  17. Need more data

  18. Dust lanes? Shocks?

  19. Second phase: 8 methanol sources data available until May 2009 Third phase: 6 H2O sources data available until the end of 2009 More 10 SiO & H2O sources with VERA

  20. summary • Measured ~20 CH3OH, H2O & SiO maser sources parallax and proper motion • Have very interesting preliminary results of galactic rotation and important parameters • Model need more data • Need southern sky data

  21. 美丽的南京大学天文系

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