2003 Fiscal Year Final Research Report Summary
An observational Study of galactic center galactic center regions with sub millimeter molecular and atomic lines
| Project/Area Number |
12304010
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
UKITA Nobuharu NAOJ, Radio Astronomy Division, Associate Professor, 電波天文学研究系, 助教授 (20184989)
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| Co-Investigator(Kenkyū-buntansha) |
EZAWA Hajime NAOJ, Radio Astronomy Division, Research Assistant, 電波天文学研究系, 助手 (60321585)
SEKIMOTO Yutaro NAOJ, Radio Astronomy Division, Professor, 電波天文学研究系, 助教授 (70262152)
NAKAI Naomasa NAOJ, Radio Astronomy Division, Professor, 電波天文学研究系, 教授 (80192665)
YAMAMOTO Satoshi the University of Tokyo, Research Center for the Early Universe and Department of Physics, Professor, 大学院・理学系研究科, 教授 (80182624)
KOHNO Kataro the university of Tokyo, Institute of Astronomy, Associate Professor, 大学院・理学系研究科, 助教授 (80321587)
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| Project Period (FY) |
2000 – 2003
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| Keywords | Interstellar cloud / radio astronomy / galactic center region / star formation / molecular line / sub millimeter / SIS receiver / remote control |
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| Research Abstract |
Observations of our galactic center:
We have mapped an area of 5 arc-minutes of the molecule cloud (0.02+0.02) that displays peculiar velocity structure discovered in the galactic center in the CI line (492 GHz). The CI emission associated with the molecular cloud which was observed with the Nobeyama 45-m telescope, appeared 30 arc-seconds away from the CO cloud. The C/CO abundance ratio was found to be 0.45, which is about 3 times as large as a typical value for giant molecular clouds. in the galactic disk. These results suggest existence of a shocked region in which molecular gas has been dissociated by shock waves by several supernova explosions.
Observation of nucleus regions galaxies:
Mapping observations in the CO (J=3-2) line were made for NGC253, a galaxy of active star formation. The strong CO emission was found not only in the center region but also in the disk a few kpc from the nucleus where the CI was also discovered.
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