Jan 11 Wed 10:00～12:00 SOKENDAI Colloquium Zoom
Jan 11 Wed 15:30～17:00 NAOJ Science Colloquium zoom / Instrument Development Bldg. 3 (hybrid)
Jan 11 Wed 16:00～17:00 NAOJ Seminar Zoom/Large Seminar Room(hybrid)
Jan 13 Fri 16:00～17:00 NAOJ Seminar Zoom/Large Seminar Room(hybrid)
詳細は以下をご覧ください。
=============== 1月11日（水） ===============
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Regular
Date and time：January 11, 2023 10:30-12:00
Place: Zoom
Speaker: Rikuto Omae
Affiliation: SOKENDAI 4th year (D2) (Supervisor: Mami Machida, Masami Ouchi, Kazuhiro Hada)
Title: Estimation of RM structures in lensing galaxies using radio polarization data
Speaker : Yuta Tashima
Affiliation: SOKENDAI 4th year (D2) (Supervisor: Mami Machida, Fumitaka Nakamura, Tomoya Takiwaki)
Title: Elucidation of galactic magnetic field structure by pseudo-observation using N-body simulation
Facilitator
-Name：Matsuda, Graduate Student Affairs Unit
=============== 1月11日（水） ===============
Campus：Mitaka
Seminar：NAOJ Science Colloquium
Regularly Scheduled/Sporadic：Every Wednesday
Date and time：2023 January 11, 15:30-17:00
Place：zoom / Instrument Development Bldg. 3 (hybrid)
Speaker：De Simone
Affiliation：NAOJ
Title：A new perspective on cosmology through Gamma-ray Bursts and Supernovae
Abstract：The state of the art of modern cosmology considers the LambdaCDM model as the standard paradigm for describing the structure and the evolution of the universe. Despite the wide success of this model, there are still many open problems on the list, in particular the Hubble constant tension. This is the discrepancy, in more than 4 sigma, between the value of the Hubble constant estimated through the local probes and the value of the Hubble constant inferred from the Cosmic Microwave Background. Supernovae Ia (SNe Ia) are able to cast more light on this open issue but, given the observational limitations, can be observed only up to redshift 2.3. New standardizable probes are needed, and in this perspective Gamma-ray Bursts (GRBs), being a class of excellent standardizable candles, gain a central role in the current and future analysis. In this talk, I will give a summary of modern cosmology and I will explain how the standard candles, such as Supernovae Ia, in combination with the Gamma-ray Bursts can cast more light on the open problems of modern cosmology.
Facilitator
-Name：Akimasa Kataoka
=============== 1月11日（水） ===============
Campus：Mitaka
Seminar：NAOJ Seminar
Regularly Scheduled/Sporadic：Regular
Date and time：2023 January 11, 16:00-17:00
Place： Zoom/Large Seminar Room(hybrid)
Speaker：Bill Shillue
Affiliation：National Radio Astronomy Observatory
Title：LO and Timing in Radio Astronomy Arrays
Abstract：National Radio Astronomy Observatory (NRAO) has a history of collaboration with NAOJ, as evidenced through such as the construction and operations of the Atacama Large Millimeter Array (ALMA). As an extension of this productive relationship, the research and technical collaboration has already started for one of the future facilities in radio astronomy, the Next Generation Very Large Array (ngVLA).I am the current team lead for the ngVLALO Reference and Timing subsystem, and a research engineer for the last thirty years with NRAO.
This talk will begin by reviewing some prior projects that I have been in involved in while at NRAO, starting with my first assignment as a new hire to work on the Green Bank tracking station in support of the Japanese VSOP-1 mission. Later work has included the single dish NRAO 12-m millimeter telescope on Kitt Peak, ALMA, the Event Horizon Telescope, the “FLAG”PAF receiver on the Green Bank Telescope (GBT), and my present work for the ngVLAproject.In each of these projects I have taken away some useful learning, much of it relating to the generation of reliable high frequency reference and LO sources, and (in the case of telescope arrays) to the coherent transmission of frequency and timing signals. The lessons learned from past experiences will be related to the new and unique challenges presented by the ngVLALO system.Finally, I will make a brief status update on ngVLAand mention a few areas of in-progress instrumental research.
Facilitator:
-Name：Aoki, Wako
=============== 1月13日（金） ===============
Campus：Mitaka
Seminar：NAOJ Seminar
Regularly Scheduled/Sporadic：Regular
Date and time：2023 January 13, 16:00-17:00
Place： Zoom/Large Seminar Room(hybrid)
Speaker：Ryohei Kawabe
Affiliation：NAOJ
Title：大型サブミリ波単一鏡計画 LST：最近の進捗、研究開発、メキシコ50m鏡での2mm受信機デモサイエンス
Abstract：Millimeter and submillimeter astronomy started from the discovery of an interstellar molecule, Carbon Monoxide (CO) at 115 GHz (2.6 mm in wavelength) in 1970, and evolved dramatically since then to the current ALMA (Atacama Large Millimeter and Submillimeter Array) era. Here we report on plan to construct a 50-m-class single dish telescope, the Large Submillimeter Telescope (LST). The European group has a similar tetescope project, Atacama Large Aperture Submillimeter Telescope (AtLAST). The LST/AtLAST will facilitate new discovery space such as wide-filed imaging with both continuum and spectral lines, along with new developments for time-domain science. The conceptual design and its key science (i.e., 3D exploration of the universe) behind the LST are briefly presented to with following my research carrier in NAOJ (NMA, Rainbow, ASTE, and ALMA). In addition, on-going R&D activity for the LST is also overviewed briefly with the recent results from demo science with the B4R (2mm receiver) on the LMT 50m telescope in Mexico, which is underway for accumulating science experiences for the future large single dishes. The demo science will provide some hint for star formation science case of the LST using the future Heterodyne array instruments.
私自身のNAOJでの研究歴を紹介しつつ、新たな計画である大型サブミリ波単一鏡計画 LSTについて、進捗状況、研究開発、メキシコ50m鏡での2mm受信機の科学評価試験等について述べる。
-Name：Aoki, Wako