Takumi Nagayama NAOJ - VERA
Takumi Nagayama NAOJ - VERA
Takumi Nagayama NAOJ - VERA
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<strong>Takumi</strong> <strong>Nagayama</strong><br />
<strong>NAOJ</strong>
�VLBI of H2O masers in star forming<br />
regions<br />
• Internal (outflow) motion of H2O masers<br />
• Comparisons with continuum/molecular line<br />
observations<br />
�Study of star-forming region with ALMA<br />
• Identification of YSO<br />
• Proper motion measurements using ALMA
W43 Main 3<br />
Parallax of ON1<br />
2.47+/-0.11 kpc<br />
<strong>Nagayama</strong>+ 2011
� H2O masers<br />
are associated<br />
with mm/submm<br />
sources.<br />
� Multiple<br />
young stellar<br />
system within<br />
a few arcsec.
ON1<br />
ON2N W43 Main 3
W43 Main 3<br />
・3 maser sources within 8” scale<br />
・bipolar and circular outflow<br />
Beuther & Shepherd 2005
W3 OH<br />
(Hachisuka+ 2006)<br />
ON1<br />
(<strong>Nagayama</strong>+ 2008)
�VLA Orion BN & Source I (Rodriguez+ 2005)<br />
• Proper motion: 10 mas/yr (error 5%)<br />
• Beam: 100 mas<br />
• Position accuracy: 10 mas<br />
• Period: 17 yr<br />
�ALMA<br />
• Proper motion: 1 mas/yr (10 km/s at 2 kpc)<br />
• Beam: 10 mas<br />
• Position accuracy: 1mas<br />
• Period: 17 yr
Moscadelli+ 2005<br />
Hofner+ 2007<br />
IRAS20126+4104<br />
• Peculiar motion: 50 km/s<br />
• Outflow motion: 30 km/s?<br />
• Stellar motion: 20 km/s?<br />
Moscadelli+ 2011
220 pc<br />
Cygnus superbubble<br />
Uyaniker+ 2001<br />
20 km/s<br />
銀河面<br />
Super nova remnant<br />
W51C<br />
Superbubble<br />
NGC281<br />
<strong>Nagayama</strong>+ 2011<br />
20—30 km/s<br />
Sato+ 2007
� Comparisons with VLBI and continuum /molecular<br />
line observations<br />
�Study of star-forming region with ALMA<br />
• Identification of YSO<br />
• Proper (stellar) motion measurements
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