Mapping our milky way with methanol masers
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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

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)


Outline
outline

  • progress of the project

  • preliminary results

  • Further work


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)


Milky Way Parallaxes

Xu, Reid, Zheng & Menten (2006)

  • W3OH:

  • = 0.512 mas

    +/- 0.010 mas


Milky Way Parallaxes

Honma et al. (2007)

  • S269:

  • = 0.189 mas

    +/- 0.016 mas


Milky Way Parallaxes

  • WB89-437:

  • = 0.167 mas

    +/- 0.006 mas

Hachisuka et al. (2009)

  • S269:

  • = 0.189 mas

    +/- 0.016 mas


Orion nebular cluster parallax
Orion Nebular Cluster Parallax

D = 414 +/- 7 pc

Menten, Reid, Forbrich & Brunthaler (2007)


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


Methanol maser parallax measurements -0.38 -1.54 -34 9

with VLBA

First phase result:

project

from 2004 to 2008


CH3OH, SiO and H2O maser parallax -0.38 -1.54 -34 9

with VLBA and VERA


The model -0.38 -1.54 -34 9

Thin disk

disk rotation speed


frame system: -0.38 -1.54 -34 9

Cartesian Galactic coordinate


data -0.38 -1.54 -34 9

Model values

Least-squarses Fitting


Best fitting: -0.38 -1.54 -34 9

Average motion:


Discrepancy: -0.38 -1.54 -34 9

kinematic distance?

?

pecular motion?


Total dynamical mass of the milky way
Total dynamical mass of the Milky Way -0.38 -1.54 -34 9

The Milky Way may have more mass


Need more data -0.38 -1.54 -34 9


Dust lanes? -0.38 -1.54 -34 9

Shocks?


Second phase: -0.38 -1.54 -34 9

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


Summary
summary -0.38 -1.54 -34 9

  • 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



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