カテゴリー別アーカイブ: 研究紹介

The Galaxy-Halo Connection Across Cosmic History / Radiation-MHD Simulation of Clumpy Outflow from Supercritical Accretion Flow / S-Cam and HSC Search of z>6 Quasars

[Speaker1]
Shogo Ishikawa, D3, SOKENDAI (Supervisor; Nobunari Kashikawa)
[Title]
The Galaxy-Halo Connection Across Cosmic History

[Speaker2]
Hiroshi Kobayashi, D3, SOKENDAI (Supervisor: Ken Ohsuga)
[Title]
Radiation-MHD Simulation of Clumpy Outflow from Supercritical Accretion Flow

[Speaker3]
Masafusa Onoue, D2, SOKENDAI (Supervisor; Nobunari Kashikawa)
[Title]
S-Cam and HSC Search of z>6 Quasars
[Abstract]
I will present several updates on our high-redshift (z>6) quasar search projects using Subaru/S-Cam and HSC.
In short, our constraints on the quasar luminosity function at z~6 suggest that quasars have only a moderate contribution on the total photons required to re-ionize the universe at z~6.
From the HSC-Wide survey, we have found ~30 low-luminosity quasars
at z>6 in ~100 deg^2 of the HSC-SSP coverage. Their NIR follow-up observation is
now ongoing with Gemini and VLT, which is for the BH mass and metallicity measurements.
Moreover, the HSC-Deep survey enables us to find much fainter quasar candidates down to z~25 AB mag.

Analysis of Molecular Lines in the Near-Infrared High Dispersion Spectra of Barnard’s Star / Understanding the circumstellar structure of high-mass young stellar objects based on KaVA observations

[Speaker1]
Hiroyuki Ishikawa, M1, SOKENDAI (Supervisor; Takayuki Kotani)
[Title]
Analysis of Molecular Lines in the Near-Infrared High Dispersion Spectra of Barnard’s Star

[Speaker2]
Jungha Kim, D1, SOKENDAI (Supervisor; Honma Mareki)
[Title]
Understanding the circumstellar structure of high-mass young stellar objects based on KaVA observations

Chemistry of Carbon-Chain Molecules around Massive Young Stellar Objects / Enhancing spectroscopy with fiber injection

[Speaker1]
Kotomi Taniguchi, SOKENDAI D2 (Supervisor; Masao Saito)
[Title]
Chemistry of Carbon-Chain Molecules around Massive Young Stellar Objects
[Abstract]
Carbon-chain molecules account for approximately 40% of the interstellar molecules, and they provide us with useful information about the star formation process. However, studies about carbon-chain molecules have been mainly conducted in low-mass star-forming regions. We now investigate the chemistry of carbon-chain molecules in high-mass star-forming regions. In this talk, I talk about the recent results with the single-dish telescopes, the Nobeyama 45-m telescope and the Green Bank 100-m telescope. We found that cyanopolyynes (HC2n+1N) are particularly abundant in high-mass star-forming regions, and the chemistry of carbon-chain molecules may be different from that in low-mass star-forming regions, namely warm carbon chain chemistry (WCCC).

[Speaker2]
Ko Hosokawa, M1, SOKENDAI (Supervisor; Takayuki Kotani)
[Title]
Enhancing spectroscopy with fiber injection