| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
This research intend to search and resolve the face-on high mass protostars, that are suitable target for direct imaging of the innermost accretion disk. We first detected five candidate of such face-on object by using the ATCA. We, next, performed a pilot-imaging observation using the ALMA long baseline towards the high mass protostellar object G353.273+0.641, which is the best candidate of a face-on object found in our ATCA survey. We successfully resolved compact accretion disk of 250 AU radius. This is the first spatially resolved view of the high mass accretion system in nearly face-on geometry. The disk showed highly anisotropic distribution of a surface density. Such a structure probably reflects the gravitational instability caused by mass accumulation via accretion flow from a surrounding molecular envelope found by CH3OH lines. This is the first detection of such a highly self-gravitating disk system in high mass star-formation.
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