Skip to main content Accessibility help

Maser Astrometry and Galactic Structure Study with VLBI


In this proceeding paper, we introduce the recent results of Galactic maser astrometry by mainly focusing on those obtained with Japanese VLBI array VERA. So far we have obtained parallaxes for 86 sources including preliminary results, and combination with the data obtained with VLBA/BeSSeL provides astrometric results for 159 sources. With these most updated results we conduct preliminary determinations of Galactic fundamental parameters, obtaining R0 = 8.16 ± 0.26 kpc and Θ0 = 237 ± 8 km/s. We also derive the rotation curve of the Milky Way Galaxy and confirm the previous results that the rotation curve is fairly flat between 5 kpc and 16 kpc, while a remarkable deviation is seen toward the Galactic center region. In addition to the results on the Galactic structure, we also present brief overviews on other science topics related to masers conducted with VERA, and also discuss the future prospect of the project.



Hide All
Boehle, A., et al., 2016, ApJ, 830, 17
Hirota, T., et al., 2007, PASJ, 59, 897
Hirota, T., et al., 2017, Nature Astronomy, 1, 146
Honma, M., et al., 2007, PASJ, 59, 889
Honma, M., et al., 2012, PASJ, 64, 136
Kobayashi, H., et al. 2003, ASP Conference Series, Vol. 306, p.367
Kim, J. H., et al. 2018, in this volume
Nakagawa, A., et al., 2016, PASJ, 68, 78
Oyama, T., et al., 2016, PASJ, 68, 105
Reid, M. J. & Honma, M., 2014, ARA&A, 52, 339
Reid, M. J., et al., 2014, ApJ, 783, 130
Sakai, N., et al., 2015, PASJ, 67, 69
Sanna, A., et al., 2017, Science, 358, 227
Sunada, K., et al. 2018, in this volume
Yamauchi, A., et al., 2016, PASJ, 68, 60
MathJax is a JavaScript display engine for mathematics. For more information see



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed