宇宙線研究所共同利用研究会・基盤研究(S)研究会
「高エネルギーガンマ線でみる極限宇宙2024」

共催 : 東京大学次世代ニュートリノ科学・マルチメッセンジャー天文学連携研究機構

"The extreme Universe viewed in very-high-energy gamma rays 2024"

co-organised with the Next-generation Neutrino Science and Multi-messengerAstronomy Organization (NNSO)

(Please see below for the English version.)

2025年1月7日(火)と8日(水)に開催される研究会「高エネルギーガンマ線でみる極限宇宙2024」の最終プログラムをお知らせいたします。
https://indico.icrr.u-tokyo.ac.jp/event/1074/program
(プログラムは、このメールの末尾にも掲載しています。)

12月30日(月)23時59分までは、参加のみの登録可能となっております。
https://indico.icrr.u-tokyo.ac.jp/event/1074/registrations/

なお、すでにご登録頂いたオンライン参加の方のZoomの接続先は、12月31日(火)頃にお知らせする予定です。

皆様のご参加をお待ちしております。
                                       CTA-Japan一同
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宇宙線研究所共同利用研究会・基盤研究(S)研究会
「高エネルギーガンマ線でみる極限宇宙2024」

"The extreme Universe viewed in very-high-energy gamma rays 2024"

共催 : 東京大学次世代ニュートリノ科学・マルチメッセンジャー天文学連携研究機構

開催日時:
2025年1月7日(火) 日本時間 10:00 - 17:40
2025年1月8日(水) 日本時間   9:30 - 16:05
※時間帯は多少変更される場合があります。

研究会URL:https://indico.icrr.u-tokyo.ac.jp/e/workshopCTAJ2024

研究会会場(ハイブリッド): 東京大学柏キャンパス 図書館メディアホール / オンライン(Zoom)

図書館メディアホール
http://www.u-tokyo.ac.jp/campusmap/cam03_04_04_j.html

東京大学柏キャンパスへのアクセス
http://www.icrr.u-tokyo.ac.jp/access/index.html

招待講演者(敬称略):
Songzhan Chen (IHEP, CAS) : LHAASO
Shion Chen (Kyoto Univ.) : SUSY searches at accelerators
Hua Feng (IHEP,CAS) : Einstein Probe
Kazuhiro Hada (Nagoya City Univ.) : KaVA
Kouichi Hagino (Univ. of Tokyo) : XRISM
Kohei Inayoshi(KIAA, Peking Univ.) : Little Red Dots and High-z AGNs
Ioannis Liodakis (Institute of Astrophysics, FORTH)[online] : IXPE
Daniel Mazin (ICRR) : CTA-LST
Maximilian Meier (Chiba Univ.) : IceCube
Shuta Tanaka (Aoyama Gakuin Univ.) : Pulsar Wind Nebulae
Kenji Toma (Tohoku Univ.) : Black Hole Magnetospheres

趣旨: Cherenkov Telescope Array (CTA) 計画は、大口径(23 m)・中口径(12 m)・小口径(4 m) の3種類の望遠鏡群を配置して、従来より10 倍の高感度と、かつてない広いエネルギー領域(20 GeV から300 TeV) のガンマ線で、極限宇宙の精密測定を行うことを目指す国際共同プロジェクトです。CTA計画が実現すれば、約1000個の天体からTeVガンマ線が検出できると予想され、パルサー/パルサー星雲、超新星残骸、活動銀河核などの高エネルギー天体での宇宙線加速と伝播過程の解明、銀河形成史や宇宙論、さらにはダークマターの探索、原始ブラックホール探索、ローレンツ不変性の検証などの基礎物理など多岐にわたるサイエンスが可能となります。

日本は、2009年に CTA Japan コンソーシアム(http://www.cta-observatory.jp/)を結成しCTAに正式メンバーとして参加をはたし、130名近くを越えるメンバーが準備研究を推進してきました。2018年10月に、北サイトのカナリー諸島ラ パルマで、日本が大きく貢献してきた大口径望遠鏡初号機が完成し、2019年11月にはかに星雲からのガンマ線、2020年1月から2月にはかにパルサーからのガンマ線の信号検出にも成功しました。現在も、活動銀河核(赤方偏移~1のFSRQも含む)、銀河中心領域、ゲミンガパルサー、再帰新星RS Ophiuchiなどの検出に成功し、順調に運用を進めています。さらに、現在大口径望遠鏡2-4号基が建設中で2025年には完成予定であり、大口径望遠鏡4台でのステレオ観測を目指しています。また、CTAの南サイトに建設する大口径望遠鏡の検出器の製作準備も開始されています。

今後、CTA時代を迎え、TeVガンマ線天文学がさらに他波長の電磁波観測や、高エネルギーニュートリノ、重力波観測との連携を深め、時間領域天文学、マルチメッセンジャー天文学の一翼を担っていくためにも、研究会を通じて広い分野の研究者と議論を深め、今後の戦略を練り、様々な角度から議論するコミュニティーに開かれたものとして開催いたします。また、基盤研究(S)(2023年度-2027年度)「CTA大口径ガンマ線望遠鏡で解き明かす高エネルギー激動宇宙と暗黒物質」として推進されているサイエンスや望遠鏡の開発状況の報告も含まれますので、この分野に興味もある方の多くのご参加をお待ちしています。

世話人: 井岡 邦仁(YITP)、窪 秀利(ICRR)、野崎 誠也(ICRR)、
     野田 浩司(千葉大学)、齋藤 隆之(ICRR)、田島 宏康(名大ISEE)、
                 手嶋 政廣(ICRR & MPI)、戸谷 友則(東京大学)、山本 常夏(甲南大学)、
                 吉越 貴紀(ICRR)、吉田 龍生(茨城大学)

==========
プログラム:
* 招待講演

===JST 10:00 -17:40 Tuesday, Jan. 7, 2025===
10:00 - 10:25 Registration for in-person participants

10:25 - 10:30   Opening

Session 1: Very-High-Energy Gamma-Ray Astrophysics
10:30 - 11:10 (35+5)*
                       "Status of the CTAO LST project"
                       Daniel Mazin (ICRR, Univ. of Tokyo)

11:10 - 11:50 (35+5)*
                       "Recent results from the LHAASO experiment"
                       Songzhan Chen (IHEP, CAS)

11:50 - 13:00 (70)   Lunch

Session 2: Dark matter searches
13:00 - 13:50 (45+5)*
                       "Dark matter searches at the LHC"
                       Shion Chen (Kyoto Univ.)

Session 3: X-Ray Emissions and Extreme Astrophysics
13:50 - 14:30 (35+5)*
                       "The Einstein Probe Mission and Early Results"
                       Hua Feng (IHEP,CAS)

14:30 - 15:10 (35+5)*
                       "Current status and early observational results
                       of X-Ray Imaging and Spectroscopy Mission (XRISM)"
                       Kouichi Hagino (Univ. of Tokyo)

15:10 - 15:40 (30)   Group photos + Coffee Break

15:40 - 16:20 (35+5)* [online    8:40 - 9.20am EET]
                       "A new window to the high-energy Universe
                       with the Imaging X-ray Polarimetry"
                       Ioannis Liodakis (Institute of Astrophysics - FORTH)

Session 4: High-z AGNs and Supermassive Black Hole Formation
16:20 - 17:00 (35+5)*
                       "Little red dots: A newly discovered AGN population in the JWST era"
                       Kohei Inayoshi(KIAA, Peking Univ.)

Session 5: Compact Objects and Extreme Astrophysics (1)
17:00 - 17:40 (35+5)*
                       "Neutrinos Based on Stochastic Acceleration Model
                       of Pulsar Wind Nebulae"
                       Shuta Tanaka (Aoyama Gakuin Univ.)

18:00 - 20:00   Banquet

===JST  9:30 -16:05 Wednesday, Jan. 8, 2025==

Session 6: Compact Objects and Extreme Astrophysics (2)
    9:30 - 10:00 (25+5)
                       "Examining the north-south symmetry
                       of pulsars based on γ-ray phaseograms"
                       Kin Hang (Paul) Yeung (ICRR, Univ. of Tokyo)

10:00 - 10:30 (25+5)
                       "Characteristic GeV/TeV Gamma-Rays from Magnetic Bullets"
                       Yo Kusafuka (ICRR, Univ. of Tokyo)

Session 7: AGN jets and Black Hole Magnetospheres
10:30 - 10:45 (10+5)
                       "Introduction to the MAGIC+LST proposal (tentative)"
                       Seiya Nozaki (ICRR, Univ. of Tokyo)

10:45 - 11:25 (35+5)*
                       "Theory of multi-wavelength flares from black hole magnetospheres
                       and strategy of joint monitoring observations of M87
                       with global VLBI, Swift and CTA"
                       Kenji Toma (Tohoku Univ.)

11:25 - 12:05 (35+5)* [online]
                       "Synergy between high-resolution VLBI
                       and VHE gamma-ray observations in the study of AGN jets"
                       Kazuhiro Hada (Nagoya City Univ.)

12:05 -13:15 (70)   Lunch

13:15 - 13:45 (25+5)
                       "Recent Highlights of Extragalactic Observations by LST-1"
                       Abhradeep Roy (Hiroshima Univ.)

Session 8: Multimessenger Astrophysics and Cosmic-Ray Acceleration

13:45 - 14:25 (35+5)*
                      "Recent IceCube Results using High Energy Astrophysical Neutrinos"
                      Maximilian Meier (Chiba Univ.)

14:25 - 14:55 (30)   Coffee Break

14:55 - 15:25 (25+5)
                       "Cosmological effects due to ultra-high-energy cosmic rays
                       and multimessenger tests "
                       Susumu Inoue (Chiba Univ. / ICRR, Univ. of Tokyo)

15:25 - 15:55 (25+5)
                      "Leptonic gamma-ray emission from star-forming galaxies"
                       Ievgen Vovk (ICRR, Univ. of Tokyo)

15:55 - 16:05   Closing
======================

-------------------------------------------------------------------------------------------------------------------------------------------------------


=====(English version)======
Workshop: "The extreme Universe viewed in very-high-energy gamma rays"

co-organised with the Next-generation Neutrino Science  and Multi-messengerAstronomy Organization (NNSO)

Date:
1st day: 7 January, 2025
         JST 10:00 - 17:40
2nd day: 8 January, 2025
         JST   9:30 - 16:05

Venue(hybrid):
The Media Hall of the Kashiwa Library in the Kashiwa Campus, the University of Tokyo
/ Online (Zoom)

Access:
http://www.u-tokyo.ac.jp/content/400020147.pdf  #2 Kashiwa Library
https://www.u-tokyo.ac.jp/en/index.html#map  #Kashiwa Campus

Outline:
The construction of Cherenkov Telescope Array (CTA)-North Large Size Telescope 1(LST-1) was completed in 2018, at the Observatorio del Roque de los Muchachos site in La Palma. In this autumn the critical design review of the LST-1 has been
successfully approved. The remaining three Large Size Telescopes (LST-2-4) are currently under construction and will be completed in 2025, aiming for stereo observations with 4 LSTs.

The commissioning phase of CTA-North LST-1 is currently progressing well. The LST-1 detected the gamma-ray signal from the Crab Nebula in November 2019 and successively detected the pulsed gamma-ray emission from the Crab pulsar in January-February 2020. In addition, we have successfully detected the emissions of AGNs including the very distant (z~1) FSRQ, the Galactic Center Region, the Geminga pulsar, and the recurrent nova RS Ophiuchi .

The CTA Observatories will play important parts in multi-messenger astronomy with a global network of gravitational wave detectors, the high-energy neutrino observatory, and other wavelength observations. In this workshop we will view the extreme Universe from observational and theoretical aspects and focus on the science targeted by the CTA LSTs, namely Gamma-Ray Bursts, Active Galactic Nuclei, Pulsars, Starburst Galaxies, Dark Matter searches, Primordial Black Hole searches, and test of Lorentz Invariance Violation.

This workshop is supported by the joint research program of the Institute for Cosmic Ray Research (ICRR), the University of Tokyo and JSPS KAKENHI Grant-in-Aid for Scientific Research (S), Number 23H05430 "Revealing the high-energy dynamic universe and dark matter with the CTA large-aperture gamma-ray telescopes".

Invited Speakers :
Songzhan Chen (IHEP, CAS) : LHAASO
Shion Chen (Kyoto Univ.) : SUSY searches at accelerators
Hua Feng (IHEP,CAS) : Einstein Probe
Kazuhiro Hada (Nagoya City Univ.) : KaVA
Kouichi Hagino (Univ. of Tokyo) : XRISM
Kohei Inayoshi(KIAA, Peking Univ.) : Little Red Dots and High-z AGNs
Ioannis Liodakis (Institute of Astrophysics, FORTH)[online] : IXPE
Daniel Mazin (ICRR) : CTA-LST
Maximilian Meier (Chiba Univ.) : IceCube
Shuta Tanaka (Aoyama Gakuin Univ.) : Pulsar Wind Nebulae
Kenji Toma (Tohoku Univ.) : Black Hole Magnetospheres

Registration:
We would kindly ask you to register if you intend to participate. Please do so here:
https://indico.icrr.u-tokyo.ac.jp/event/1074/registrations/

Registration deadline: 16 December, 2024

SOC:
Kunihito Ioka (YITP), Hidetoshi Kubo (ICRR),
Seiya Nozaki(ICRR), Koji Noda (Chiba Univ.),
Takayuki Saito (ICRR), Hiroyasu Tajima (ISEE, Nagoya Univ.),
Masahiro Teshima (ICRR& MPI),Tomonori Totani (Univ. of Tokyo),
Tokonatsu Yamamoto (Konan Univ.), Takanori Yoshikoshi (ICRR),
Tatsuo Yoshida (Ibaraki Univ.)

==========
Program:
* invited talks

===JST 10:00 -17:40 Tuesday, Jan. 7, 2025===
10:00 - 10:25 Registration for in-person participants

10:25 - 10:30   Opening

Session 1: Very-High-Energy Gamma-Ray Astrophysics
10:30 - 11:10 (35+5)*
                       "Status of the CTAO LST project"
                       Daniel Mazin (ICRR, Univ. of Tokyo)

11:10 - 11:50 (35+5)*
                       "Recent results from the LHAASO experiment"
                       Songzhan Chen (IHEP, CAS)

11:50 - 13:00 (70)   Lunch

Session 2: Dark matter searches
13:00 - 13:50 (45+5)*
                       "Dark matter searches at the LHC"
                       Shion Chen (Kyoto Univ.)

Session 3: X-Ray Emissions and Extreme Astrophysics
13:50 - 14:30 (35+5)*
                       "The Einstein Probe Mission and Early Results"
                       Hua Feng (IHEP,CAS)

14:30 - 15:10 (35+5)*
                       "Current status and early observational results
                       of X-Ray Imaging and Spectroscopy Mission (XRISM)"
                       Kouichi Hagino (Univ. of Tokyo)

15:10 - 15:40 (30)   Group photos + Coffee Break

15:40 - 16:20 (35+5)* [online    8:40 - 9.20am EET]
                       "A new window to the high-energy Universe
                       with the Imaging X-ray Polarimetry"
                       Ioannis Liodakis (Institute of Astrophysics - FORTH)

Session 4: High-z AGNs and Supermassive Black Hole Formation
16:20 - 17:00 (35+5)*
                       "Little red dots: A newly discovered AGN population in the JWST era"
                       Kohei Inayoshi(KIAA, Peking Univ.)

Session 5: Compact Objects and Extreme Astrophysics (1)
17:00 - 17:40 (35+5)*
                       "Neutrinos Based on Stochastic Acceleration Model
                       of Pulsar Wind Nebulae"
                       Shuta Tanaka (Aoyama Gakuin Univ.)

18:00 - 20:00   Banquet

===JST  9:30 -16:05 Wednesday, Jan. 8, 2025==

Session 6: Compact Objects and Extreme Astrophysics (2)
    9:30 - 10:00 (25+5)
                       "Examining the north-south symmetry
                       of pulsars based on γ-ray phaseograms"
                       Kin Hang (Paul) Yeung (ICRR, Univ. of Tokyo)

10:00 - 10:30 (25+5)
                       "Characteristic GeV/TeV Gamma-Rays from Magnetic Bullets"
                       Yo Kusafuka (ICRR, Univ. of Tokyo)

Session 7: AGN jets and Black Hole Magnetospheres
10:30 - 10:45 (10+5)
                       "Introduction to the MAGIC+LST proposal (tentative)"
                       Seiya Nozaki (ICRR, Univ. of Tokyo)

10:45 - 11:25 (35+5)*
                       "Theory of multi-wavelength flares from black hole magnetospheres
                       and strategy of joint monitoring observations of M87
                       with global VLBI, Swift and CTA"
                       Kenji Toma (Tohoku Univ.)

11:25 - 12:05 (35+5)* [online]
                       "Synergy between high-resolution VLBI
                       and VHE gamma-ray observations in the study of AGN jets"
                       Kazuhiro Hada (Nagoya City Univ.)

12:05 -13:15 (70)   Lunch

13:15 - 13:45 (25+5)
                       "Recent Highlights of Extragalactic Observations by LST-1"
                       Abhradeep Roy (Hiroshima Univ.)

Session 8: Multimessenger Astrophysics and Cosmic-Ray Acceleration

13:45 - 14:25 (35+5)*
                      "Recent IceCube Results using High Energy Astrophysical Neutrinos"
                      Maximilian Meier (Chiba Univ.)

14:25 - 14:55 (30)   Coffee Break

14:55 - 15:25 (25+5)
                       "Cosmological effects due to ultra-high-energy cosmic rays
                       and multimessenger tests "
                       Susumu Inoue (Chiba Univ. / ICRR, Univ. of Tokyo)

15:25 - 15:55 (25+5)
                      "Leptonic gamma-ray emission from star-forming galaxies"
                       Ievgen Vovk (ICRR, Univ. of Tokyo)

15:55 - 16:05   Closing
======================

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