Home > ALMA Jセミナー | 国立天文台談話会 | 太陽系小天体セミナー | 科学研究部コロキウム | 総研大コロキウム > 2022.5.30-2022.6.5


May 31 Tue 10:00~11:30 太陽系小天体セミナー Solar System Minor Body Seminar zoom

June 1 Wed 10:30~12:00 SOKENDAI Colloquium  zoom

June 1 Wed 14:30~15:30  ALMA-J seminar zoom

June 1 Wed 15:30~17:00  NAOJ Science Colloquium zoom

June 1 Wed 16:00~17:00  NAOJ Seminar  zoom /Large Seminar Room













Seminar:SOKENDAI Colloquium
Regularly Scheduled/Sporadic:Regular
Date and time:June 1st, 2022 10:30-12:00

Speaker 1: Kiyoaki Doi
Affiliation: SOKENDAI 3rd year (D1) (Supervisor: Akimasa Kataoka, Hideko Nomura, Misato Fukagawa)
Title: Review: A Highly Settled Disk around Oph163131 (Villenave et al. 2022, ApJ, 930, 11)

Speaker 2: Tomohiro Yoshida
Affiliation: SOKENDAI 2nd year (M2) (Supervisor: Hideko Nomura, Misato Fukagawa, Akimasa Kataoka)
Title: Spectro-astrometry of protoplanetary disks

-Name:Matsuda, Graduate Student Affairs Unit


Seminar;ALMA-J seminar
Regularly Scheduled/Sporadic;Every Wednesday
Date and Time;2022 June 1 14:30-15:30
Speaker;Tomoko Suzuki

IPMU, University of Tokyo

Title: Star-formation activity and gas content in quiescent galaxies at z~3.7 constrained with ALMA

Abstract: The discovery in deep near-infrared surveys of a population of massive quiescent galaxies at z > 3 has given rise to the question of how they came to be quenched so early in the history of the Universe. Follow-up observations at mm/sub-mm wavelengths of such quiescent galaxies are crucial to confirm the presence of the dust-obscured star-formation and give a constraint on their molecular gas contents. Measuring their molecular gas properties allows us to distinguish between physical processes where they stop forming stars due to a lack of fuel versus those where star-formation efficiency is reduced and the gas is retained. We conducted ALMA observations of four quiescent galaxies at z = 3.5-4.0 found by the Fourstar Galaxy Evolution Survey (ZFOURGE) and a serendipitous optical-dark galaxy at z = 3.71. The Band-7 observations confirm the passive nature of the four quiescent galaxies. We also find that all the targets have gas mass fractions of < 20% with the Band-3 data targeting the atomic carbon line. In this talk, I will introduce previous works about quiescent galaxies at z > 3 done by the ZFOURGE team. Then I will show the latest results on their gas properties with ALMA and discuss a possible quenching mechanism of massive galaxies at z > 3.5.

Daisuke Iono, Andrea Silva


Seminar:NAOJ Science Colloquium
Regularly Scheduled/Sporadic:Every Wednesday
Date and time:2021 June 1, 15:30-17:00
Title: TBD
Speaker: Hoshino Haruka (D3)
Abstract: TBD
Title: Observability of magnetic field in lensing galaxies using broadband radio polarization data
Speaker: Ohmae Rikuto (D2)
Abstract: External galaxies often intervene in front of background radio sources such as quasars and radio galaxies. Linear polarization of the background emission is depolarized by Faraday rotation of inhomogeneous magnetized plasma of the intervening galaxies. Exploring the depolarizing intervening galaxies can be a powerful tool to investigate the cosmological evolution of the galactic magnetic field. Recently, Mao et al. (2016) detected coherent μG magnetic fields in the lensing disk galaxy by exploiting the scenario where the polarized radio emission from a background source is gravitationally lensed by an intervening galaxy using broadband radio polarization data. The method is based on the difference in Faraday depths where the background source emission passes through different positions of the intervening galaxies due to the gravitational lensing effect. Using a galactic magnetic field model, we investigate how background polarized sources are observed due to gravitational lensing effects of intervening galaxies. We will discuss whether spectral changes and galactic magnetic fields can be estimated when RM structures are present in the region through which the background source emission passes.

-Name:Akimasa Kataoka


Campus: Mitaka
Seminar: NAOJ seminar
Regularly Scheduled/Sporadic: Every Friday
Date and Time: 2022 June 1 16:00-17:00
Place: Zoom / Large Seminar Room
Speaker:Chris Packham (University of Texas at San Antonio, and NAOJ)
Title: Thermal-IR Observations of AGN: Why and near/long-term plans
As we excitedly await the opportunities that JWST will provide, and the 30m class telescopes after that, the field of thermal-IR (TIR) astronomy continues to gather attention. In this talk, I discuss AGN TIR work, in both the science and instrumentation arenas. I use this to illustrate the path I hope to follow in the coming years. In the final section I discuss some changes the pandemic has brought to teaching and research at UTSA.

Facilitator: 中村 文隆 / Nakamura, Fumitaka

Home > ALMA Jセミナー | 国立天文台談話会 | 太陽系小天体セミナー | 科学研究部コロキウム | 総研大コロキウム > 2022.5.30-2022.6.5

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