Observational studies of galaxies in the era of violent evolution
| Project/Area Number |
24540230
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Kyoto University |
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Principal Investigator |
OHTA Kouji 京都大学, 理学(系)研究科(研究院), 教授 (50221825)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 銀河 / 電波天文学 / 光赤外線天文学 / 天文 |
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| Outline of Final Research Achievements |
Studies of evolution of galaxies at redshift = 1~2 (cosmic age of 3-5 Gyr) are important, because galaxies are considered to be evolving violently in the era.
We estimated molecular gas masses and the fractions for star-forming galaxies in the universe with an age of about 4 Gyr with ALMA telescope. We also derived gas metallicity in galaxies in the same era by using the Subaru telescope. Comparing these quantities with galaxy chemical evolution model, we found that gas inflow and out flow into/from galaxies play an important role for galaxy evolution; galaxies have been evolving by blancing gas inflow and star formation and gas out flow. We also studied evolution of galaxy morphology; the epoch of emergence of round disk galaxies is turned out to be around at the cosmic age of 6 Gyr.
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Report
(4 results)
Research Products
(42 results)
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[Journal Article] ALMA Observation of 158 mum [C II] Line and Dust Continuum of a z = 7 Normally Star-forming Galaxy in the Epoch of Reionization2014
Author(s)
Ota, Kazuaki; Walter, Fabian; Ohta, Kouji; Hatsukade, Bunyo; Carilli, Chris L.; da Cunha, Elisabete; Gonzalez-Lopez, Jorge; Decarli, Roberto; Hodge, Jacqueline A.; Nagai, Hiroshi; Egami, Eiichi; Jiang, Linhua; Iye, Masanori; Kashikawa, Nobunari; Riechers, Dominik A.; Bertoldi, Frank; Cox他3名
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Journal Title
The Astrophysical Journal
Volume: 792
Issue: 1
Pages: 34-46
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Probing intergalactic neutral hydrogen by the Lyman alpha red dumping wing of gamma-ray burst 130606A afterglow spectrum at z=5.9132014
Author(s)
Totani, Tomonori; Aoki, Kentaro; Hattori, Takashi; Kosugi, George; Niino, Yuu; Hashimoto, Tetsuya; Kawai, Nobuyuki; Ohta, Kouji; Sakamoto, Takanori; Yamada, Toru
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 66
Issue: 3
Pages: 63-76
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] The Cosmic BPT Diagram: Confronting Theory with Observations2013
Author(s)
Kewley, L. J., Maier, C., Yabe, K., Ohta, K., Akiyama, M., Dopita, M. A., and Yuan, T.
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Journal Title
The Astrophysical Journal
Volume: 774
Issue: 1
Pages: L10-L10
DOI
Related Report
Peer Reviewed
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