December 5 Tue 10:00-11:30 太陽系小天体セミナー
Zoom
December 6 Wed 10:30-12:00 SOKENDAI Colloquium
Large Seminar Room in Subaru Building and Zoom (hybrid)
December 6 Wed 11:00-12:00 Tea Talk
Zoom
December 6 Wed 15:30-16:30 NAOJ Science Colloquium
Large Seminar Room in Subaru Building and Zoom (hybrid)
December 8 Fri 16:00-17:00 NAOJ Seminar
Large Seminar Room in Subaru Building and Zoom (hybrid)
詳細は下記からご覧ください。
=============== December 5 Tue ===============
キャンパス：三鷹
セミナー名：太陽系小天体セミナー
定例・臨時の別：定例
日時：12月5日（火曜日）10時00分～11時30分
場所：zoom
講演者：渡部潤一
世話人の連絡先
名前：渡部潤一
備考：テレビ会議またはスカイプによる参加も可
=============== December 6 wed===============
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Regular
Date and time：December 6, 2023 10:30-12:00
Place：Large Seminar Room in Subaru Building and Zoom
Speaker: Abdurrahman Naufal
Affiliation: SOKENDAI 4th year (D2) (Supervisor: Yusei Koyama, Masayuki Tanaka, Yuichi Matsuda)
Title: Searching for quiescent galaxies in the Spiderweb protocluster with HST grism observation
Speaker: Takaho Masai
Affiliation: SOKENDAI 55h year (D3) (Supervisor: Alvaro Gonzalez, Yoshinori Uzawa, Takafumi Kojima)
Title: The Design of Frequency Independent Optics for (Sub)Millimeter Wave Multibeam Receivers
Facilitator
-Name：Matsuda, Graduate Student Affairs Unit
=============== December 6 wed==============
キャンパス：三鷹 野辺山 水沢 岡山 ハワイ
セミナー名：Tea Talk
定例・臨時の別：臨時
日時：12/6（水）11：00～12：00
場所：Zoom
Speaker: Séamus Duffy, Research Student, SOKENDAI
Title: Science Outreach in Ireland: Science Education at Birr Castle with I-LOFAR
Abstract: This tea-talk will talk a little bit about Ireland, and also about outreach there, broaching topics such as: who we target, how we target them, what activities and projects do we run, and adapting to Covid and a post-Covid world.
Bio: Séamus Duffy is a current research student at NAOJ working with the SCExAO team, focusing on applications of machine learning and AI to astronomy.
He originally came to Japan in 2017 and worked as an English teacher in Tokyo, where he stayed for four years before returning to Ireland in 2020. In Ireland he worked with the Technological University of the Shannon, Trinity College Dublin, and Dublin Institute for Advanced Studies as the education and engagement manager for the I-LOFAR project at Birr Castle, home of the Leviathan telescope. I-LOFAR is the Irish installation in the low frequency array, a radio telescope network which cover most of the European continent. He has a huge passion for teaching, outreach and inspiring younger minds to get involved with astronomy. During his time in outreach he worked to educate about I-LOFAR and the science being conducted at the telescope to the local population of Birr, local schools, businesses, and government officials. He was particularly interested in conducting outreach in a post-covid environment and utilising online and digital spaces for outreach programmes.
世話人の連絡先：
-名前：藤田登起子
=============== December 6 wed==============
Campus: Mitaka
Seminar: NAOJ Science Colloquium
Date and time: 2023 Dec. 6 (Wed.), 15:30-16:30
Place: the large seminar room / Zoom (hybrid)
Speaker: Moka Nishigaki
Affiliation: NAOJ (D1)
Title: Uncovering the Chemical Evolution of Galaxies from z=0–5 using the UniverseMachine
Abstract:
Cosmic baryon cycling is pivotal to galaxy evolution, and the amount of metals present in galaxies’ ISMs provides a key window into the gas cycling process. Recent JWST metallicity measurements and constraints on galaxy ISM masses have made it possible to recover the chemical evolution history of galaxies. In this talk, I present a novel empirical model that infers the average metallicity evolution of galaxies from redshift z=5 to z=0. Anchored in the UniverseMachine
(Behroozi+19) framework, our model converts observations of gas-phase metallicities across z=0—5 and galaxy ISM masses into constraints on the ISM return fraction, a key parameter quantifying the recycling of metals into the ISM versus expulsion into the CGM. I will show the initial results on how the ISM return fraction changes with mass and redshift.
Speaker: Xingqun Yao
Affiliation: Beihang University
Title: Neutrino Mass Hierarchy from Supernova Nucleosynthesis of Light Elements and the Roles of Unstable Nuclei
Abstract:
The origin of neutrino mass and mass hierarchy is one of the biggest unanswered questions in physics. In this talk I propose an astrophysical method so that the supernova (SN) ν-process nucleosynthesis, which is consistent with the mass hierarchy constrained from various ν-oscillation experiments, should provide independent observational signals of nucleosynthetic products in the specific nuclei such as 138La, 19F, 7Li, 11B and others (so-called ν nuclei) through the ν-flavor oscillation due to the MSW matter effect and the effect of collective oscillation [1].
Core-collapse SNe emits a huge number of neutrinos which bring valuable observational information on how the neutrinos propagate through the high-density matter and change their flavors and how explosive nucleosynthesis occurs. We found that the still unknown mass hierarchy is imprinted in the nucleosynthetic products of ν-nuclei [1,2]. In this talk, I will discuss the mechanism of SN ν-process nucleosynthesis and try to constrain the mass hierarchy by comparing our theoretical prediction of nuclear abundances and observed values in the meteorites and spectrascopy study. Among the calculated results, the abundance ratios of 11B/138La and 19F/16Oprovide exclusively sensitive probes to neutrino mass hierarchy [1]. These ratios are also influenced by the mass cut during the ejection phase of SN materials. These facts provide valuable quantitative tools to constrain the mass hierarchy through precise measurements of nuclear abundances of these ν-nuclei in SiC-X pre-solar grains and comprehensive studies of solar-system abundances.
Facilitator
-Name: Haruka Kusakabe
Comment: English
=============== December 8 Fri==============
Campus：Mitaka
Seminar：NAOJ Seminar
Regularly Scheduled/Sporadic：Regular
Date and time：December 8, 2023 16:00-17:00
Place：Zoom/Large Seminar Room (hybrid)
Speaker：Prof. Cecilia Lunardini
Affiliation：Arizona State University
Title：Neutrinos and gravity: multimessenger scenarios
Abstract:Multimessenger astronomy is developing rapidly, and neutrinos are major players in its vast landscape. It is hoped that, in the near future, experimental and theoretical developments will lead to the detection of neutrinos and gravitational waves from the same class of source. I discuss possible scenarios, involving neutrinos and gravitational waves from core collapse supernovae, and from binary mergers of matter-rich compact objects (for example, two neutron stars). I will also discuss tidal disruption events, where a star is torn apart and eventually accreted by a supermassive black hole. These events, which produce flares at infrared, optical and X-ray wavelengths, are sources of sub-Hz gravitational waves, and could emit very high energy neutrinos and cosmic rays. Emphasis will be placed on the feasibility and physics potential of future observations of neutrinos and other messengers from these diverse classes of emitters.
Facilitator
-Name：Shinobu Ozaki