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2019-05

Protoclusters at z~4 found by Hyper Suprime-Cam Subaru Strategic Program and their UV-brightest galaxies / Correlation between galaxy and intergalactic gas at z=2.2 mapped by Subaru/HSC

[Speaker1]

Kei Ito,
SOKENDAI 3rd year (D1)
(Supervisor: Masayuki Tanaka, Yuichi Matsuda, Yusei Koyama)

[Title1]

Protoclusters at z~4 found by Hyper Suprime-Cam Subaru Strategic Program and their UV-brightest galaxies

[Speaker2]

Yongming Liang,
SOKENDAI 2nd year (M2)
(Supervisor: Masayuki Tanaka, Yuichi Matsuda, Yutaka Komiyama)

[Title2]

Correlation between galaxy and intergalactic gas at z=2.2 mapped by Subaru/HSC

Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry (Review of Bowman et al. 2019)

[Speaker]

Yoshiki Hatta,
SOKENDAI 4th year (D2)
(Supervisor: Takashi Sekii, Yukio Katsukawa, Hirohisa Hara)

[Title]

Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry (Review of Bowman et al. 2019)

Linear Polarization in Lyman-α Solar Spicules Observed by CLASP / Recent gravitational waves detection and my progress of filter cavity experiment

[Speaker1]

Masaki Yoshida,
SOKENDAI 5th year (D3)
(Supervisor: Yoshinori Suematsu, Hirohisa Hara, Ryohko Ishikawa)

[Title1]

Linear Polarization in Lyman-α Solar Spicules Observed by CLASP

[Speaker2]

Yuhang Zhao,
SOKENDAI 4th year (D2)
(Supervisor: Matteo Leonardi, Raffaele Flaminio, Ryutaro Takahashi)

[Title2]

Recent gravitational waves detection and my progress of filter cavity experiment

Halo stars with asteroseismology and with high-resolution spectroscopy / Inflow and outflow parameters of nearby galaxies revealed by SDSS and ALFALFA

[Speaker1]

Tadafumi Matsuno,
SOKENDAI 6th year (D3)
(Supervisor: Aoki Wako, Tsujimoto Takuji, Komiyama Yutaka)

[Title1]

Halo stars with asteroseismology and with high-resolution spectroscopy

[Abstract1]

The long-term high-precision photometric observation by the Kepler mission has enabled us to infer stellar masses of a large number of red giants through stellar oscillation frequencies. The masses can easily be converted to stellar ages, which is one of the fundamental parameters of stars in the context of the Galactic archaeology. Although this approach has been applied to stars belonging to the Galactic disk, application to halo stars has been limited. Here we have identified 26 halo stars in the field that Kepler has observed for four years and conducted high-resolution spectroscopy for them. We refined stellar parameter estimates from the high-resolution spectra through a line-by-line differential analysis and measured detailed chemical abundances. In the talk, I will report the recent progress of this project.

[Speaker2]

Shigeru Namiki,
SOKENDAI 3rd year (D1)
(Supervisor: Yusei Koyama, Masato Onodera, Masayuki Tanaka)

[Title2]

Inflow and outflow parameters of nearby galaxies revealed by SDSS and ALFALFA

[Abstract2]

It is well known that galaxy inflow and outflow play important roles in shaping the history of galaxy evolution. However, any existing telescopes or instruments cannot directly constrain these processes in the distant universe. We here attempt to study the inflow and outflow properties of galaxies by adopting a simple model and by exploiting key observational properties (stellar mass, gas fraction, and metallicity, i.e. “integrated” properties of star formation in the past). We used 3441 local galaxies from the cross-matched SDSS-ALFALFA samples. These galaxies are divided into 24 subsamples by their stellar mass and the offsets from the star-forming main sequence (ΔMS). We fit the galaxies in each subsample (hence at fixed stellar mass and SFR) with the ’leaky-box’ model and obtain their inflow and outflow parameters. We find that, while both inflow and outflow parameters depend on ?MS, only inflow parameters show a trend with stellar mass. In my poster, I will discuss the interpretation of our results in the context of the geometry of star formation within the galaxies as well as the shape of the gravitational potential well of the galaxies (the distribution of baryon and dark matter).

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