資料9-J

Activity Report of Commission J
July 31, 2021 to April 30, 2022
May 17, 2022
Nario Kuno (University of Tsukuba)

ALMA project

ALMA press release (April 7, 2022)(from NAOJ webpage https://alma-telescope.jp/en/news/most-distant-galaxy-202204)

Most Distant Galaxy Candidate Yet
An international astronomer team has discovered the most distant galaxy
candidate to date, named HD1, which is about 13.5 billion light-years away. This
discovery implies that bright systems like HD1 existed as early as 300 million years
after the Big Bang. This galaxy candidate is one of the targets of the James Webb
Space Telescope launched late last year. If observations with the James Webb Space
Telescope confirm its exact distance, HD1 will be the most distant galaxy everrecorded.

Three-color image of HD1, the most distant galaxy candidate to date, created using data from the VISTA
telescope. The red object in the center of the zoom-in image is HD1.
Credit: Harikane et al.

Activities of meetings
Radio Astronomy Future Plan Review Symposium 2021
Date: Jul. 31st, 2021 : Online meeting
At this symposium, representatives of the future plans for the field of radio astronomy,
who submitted the LoI (Letter of Intent) to Master Plan 2023, gave lectures on their future plans.
The purpose of this symposium was to deepen the community's understanding of the proposed

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plan and to solicit opinions from the community.
Radio/Interferometer summer school
Date: Sep. 16th, 17th, 21st, 22nd, 24th, 2021 : Online meeting

ALMA workshop: Cold outflows near and far: crossroads of our current understandings
Date: Nov. 1st - 2nd, 2021 : Online meeting
This workshop was held to review recent findings on outflows (observed by ALMA) foundon various astronomical scales from protostars to distant galaxies and to deepen theirunderstanding of their properties.

Linking the science of large interferometers in the 2030s
Date: Nov. 30th - Dec. 1st, 2021 : Online meeting
The goals of this workshop are to (1) identify scientific synergies between future large
interferometers, SKA and ngVLA, and their synergies with current facilities such as ALMA andVLBI collaborations, (2) discuss the future science landscape with large interferometers(ALMA, VLBI, SKA, ngVLA) for the Japanese community in the 2030s and beyond.

VLBI Consortium Symposium 2021: Know the current location of domestic VLBI
Date: Dec. 2nd – 4th, 2021
Venue: National Astronomical Observatory of Japan (Mitaka) and online
At the symposium, the specific activities that are currently underway were reported, andshared and discussed the status of activities within the community. In addition, while deepening
these discussions, the research plans of the VLBI community in Japan in collaboration withastronomical research, geodesy research, and technological development research werediscussed.

FY2021 ALMA/45m/ASTE Users Meeting
Date: Dec. 14th, 16th, 21st, 2021 : Online meetingALMA workshop: Science of mm/submm VLBI with ALMA
Date: Dec. 20th, 22nd, 2021 : Online meeting
The ALMA workshop was held to discuss science by millimeter/submillimeterwave VLBI. At the workshop, science that cannot be achieved by the current VLBI
in the cm/mm band, but is made possible only by millimeter/submillimeter VLBI
observations with ALMA was discussed.

Black Hole Astrophysics with VLBI 2022
Date: Feb. 7th – 9th, 2022 : Online meeting

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The accretion flow, jet wind, and black hole, were discussed focusing on VLBI
high-resolution observations and theories, including the Event Horizon Telescope and the East
Asian VLBI network.
The 22nd mm/submm receiver Workshop
Date: Feb. 21st - 22nd, 2022 : Online meeting
This workshop was held to create cutting-edge technologies, innovative applications, andexpansion of basic technologies related to ultra-high-sensitivity receivers for millimeter,
submillimeter, and terahertz waves. The purposes of this workshop were to provide a place forpeople to gather and discuss the latest information freely and openly, and to further improve
Japan's international competitiveness and driving force, improve development efficiency, and toexpand/inherit the base of basic technological capabilities.

Radio Astronomy Consortium Symposium 2021
Date: Mar. 7th-8th, 2022 : Online meeting
The primary purpose of this year's Radio Astronomy Consortium Symposium was toreturn to its original purpose and share the latest achievements in each of Japan's wide-ranging
radio astronomy fields.

East Asian ALMA Development Workshop 2022
Date: Mar. 9th-10th, 2022 : Online meeting
The main topic of this year was future of Science Archive. Improvements to ALMA
Science Archive is one of the key development items for the success of ALMA in the era of2030 as discussed in ALMA Development Road Map.

ALMAworkshop:

Synergies

between

ALMA

andwide-fieldhigh-cadence

multi-wavelength surveys
Date: Mar. 28th – 30th, 2022 : Online meeting
This workshop was held to discuss synergies between ALMA and the ongoing and future
surveys in the space, time, and energy (i.e., wavelength) domains, such as those with HSC/PFS
at opt/NIR wavelength, the CMB surveyors (e.g., LiteBIRD, PolarBear), and those from
SKA1/ngVLA.

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