Takumi Nagayama NAOJ - VERA

veraserver.mtk.nao.ac.jp

Takumi Nagayama NAOJ - VERA

Takumi Nagayama

NAOJ


�VLBI of H2O masers in star forming

regions

• Internal (outflow) motion of H2O masers

• Comparisons with continuum/molecular line

observations

�Study of star-forming region with ALMA

• Identification of YSO

• Proper motion measurements using ALMA


W43 Main 3

Parallax of ON1

2.47+/-0.11 kpc

Nagayama+ 2011


� H2O masers

are associated

with mm/submm

sources.

� Multiple

young stellar

system within

a few arcsec.


ON1

ON2N W43 Main 3


W43 Main 3

・3 maser sources within 8” scale

・bipolar and circular outflow

Beuther & Shepherd 2005


W3 OH

(Hachisuka+ 2006)

ON1

(Nagayama+ 2008)


�VLA Orion BN & Source I (Rodriguez+ 2005)

• Proper motion: 10 mas/yr (error 5%)

• Beam: 100 mas

• Position accuracy: 10 mas

• Period: 17 yr

�ALMA

• Proper motion: 1 mas/yr (10 km/s at 2 kpc)

• Beam: 10 mas

• Position accuracy: 1mas

• Period: 17 yr


Moscadelli+ 2005

Hofner+ 2007

IRAS20126+4104

• Peculiar motion: 50 km/s

• Outflow motion: 30 km/s?

• Stellar motion: 20 km/s?

Moscadelli+ 2011


220 pc

Cygnus superbubble

Uyaniker+ 2001

20 km/s

銀河面

Super nova remnant

W51C

Superbubble

NGC281

Nagayama+ 2011

20—30 km/s

Sato+ 2007


� Comparisons with VLBI and continuum /molecular

line observations

�Study of star-forming region with ALMA

• Identification of YSO

• Proper (stellar) motion measurements

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