Koyama Shoko 小山翔子

Researcher Number	20909759
Other IDs
Affiliation (Current)	2025: 新潟大学, 自然科学系, 助教
Affiliation (based on the past Project Information) *help	2022 – 2024: 新潟大学, 自然科学系, 助教
Review Section/Research Field	Principal Investigator Basic Section 16010:Astronomy-related Except Principal Investigator Medium-sized Section 16:Astronomy and related fields
Keywords	Principal Investigator ガンマ線天体 / 超長基線電波干渉計(VLBI) / 相対論的ジェット / 活動銀河核 / ブラックホール Except Principal Investigator 超長基線電波干渉計 / 電波天文学 / 相対論的ジェット / ブラックホール

Understanding the formation mechanism of high-energy gamma-ray emission with global milimeter VLBI observationsPrincipal Investigator
- Principal Investigator
  
  小山翔子
- Project Period (FY)
  2023 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 16010:Astronomy-related
- Research Institution
  Niigata University
Understanding the formation mechanisms of supermassive black holes jets using high-resolution and high-cadence millimeter VLBI observations
- Principal Investigator
  
  秦和弘
- Project Period (FY)
  2022 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Review Section
  
  Medium-sized Section 16:Astronomy and related fields
- Research Institution
  Nagoya City University
  National Astronomical Observatory of Japan

All 2024 2023 2022

All Journal Article Presentation

[Journal Article] The persistent shadow of the supermassive black hole of M 87. I. Observations, calibration, imaging, and analysis2024
- Author(s)
  Event Horizon Telescope Collaboration et al., incluing M. Honma, S. Ikeda, M. Sasada
- Journal Title
  
  Astronomy & Astronphysics
  
  Volume: 681 Pages: A79-A79
- DOI
  10.1051/0004-6361/202347932
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19KK0081, KAKENHI-PROJECT-23K03448, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-18K13594
[Journal Article] TELAMON: Effelsberg monitoring of AGN jets with very-high-energy astroparticle emission2024
- Author(s)
  Eppel F.、Kadler M.、Giroletti M.、Koyama S.、Krichbaum T. P.、Mannheim K.、Ros E.、Zensus J. A.、et al.
- Journal Title
  
  Astronomy & Astrophysics
  
  Volume: 684 Pages: A11-A11
- DOI
  10.1051/0004-6361/202348262
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03453
[Journal Article] First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization2023
- Author(s)
  Event Horizon Telescope Collaboration et al., incluing M. Honma, S. Ikeda, M. Sasada
- Journal Title
  
  Astrophysical Journal Letters
  
  Volume: 957 Issue: 2 Pages: L20-L20
- DOI
  10.3847/2041-8213/acff70
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19KK0081, KAKENHI-PROJECT-23K03448, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-18K13594
[Journal Article] The Greenland Telescope?Construction, Commissioning, and Operations in Pituffik2023
- Author(s)
  Chen Ming-Tang、Asada Keiichi、Matsushita Satoki、Inoue Makoto、Ho Paul T. P.、Norton Timothy、Patel Nimesh A.、Nystrom George、Huang Chih-Wei L.、Martin-Cocher Pierre、Yi Koay Jun、Romero-Canizales Cristina、Liu Ching-Tang、Huang Teddy、Ogawa Hideo、Kimura Kimihiro、Pu Hung-Yi、Koyama Shoko、Nakamura Masanori、 et al.
- Journal Title
  
  Publications of the Astronomical Society of the Pacific
  
  Volume: 135 Issue: 1051 Pages: 095001-095001
- DOI
  10.1088/1538-3873/acf072
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03453
[Journal Article] Comparison of Polarized Radiative Transfer Codes Used by the EHT Collaboration2023
- Author(s)
  Prather Ben S.、Dexter Jason、Moscibrodzka Monika、et al.
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 950 Issue: 1 Pages: 35-35
- DOI
  10.3847/1538-4357/acc586
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03448, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-18K13594
[Journal Article] A ring-like accretion structure in M87 connecting its black hole and jet2023
- Author(s)
  Ru L. et al., including M. Honma
- Journal Title
  
  Nature
  
  Volume: 616 Issue: 7958 Pages: 686-690
- DOI
  10.1038/s41586-023-05843-w
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19KK0081, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-20K04020, KAKENHI-PROJECT-18K13594
[Journal Article] Multimessenger Characterization of Markarian 501 during Historically Low X-Ray and γ-Ray Activity2023
- Author(s)
  MAGIC Collaboration:Abe H., Kushida J., Nishijima K., et al.
- Journal Title
  
  The Astrophysical Journal Supplement Series
  
  Volume: 266 Issue: 2 Pages: 37-37
- DOI
  10.3847/1538-4365/acc181
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-22K03663, KAKENHI-PROJECT-22K03684, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-18KK0384, KAKENHI-PROJECT-20H01916
[Journal Article] Spectral analysis of a parsec-scale jet in M 87: Observational constraint on the magnetic field strengths in the jet2023
- Author(s)
  Ro, H. et al., including M. Honma
- Journal Title
  
  Astronomy & Astrophysics
  
  Volume: 673 Pages: A159-A159
- DOI
  10.1051/0004-6361/202142988
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19KK0081, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-21K03618, KAKENHI-PROJECT-21K03628, KAKENHI-PROJECT-18K13594
[Journal Article] The Past and Future of East Asia to Italy: Nearly Global VLBI2023
- Author(s)
  Gabriele Giovannini, Yuzhu Cui, Kazuhiro Hada, Kunwoo Yi, Hyunwook Ro, Bong Won Sohn, Mieko Takamura, Salvatore Buttaccio, Filippo D’Ammando, Marcello Giroletti, Yoshiaki Hagiwara, Motoki Kino, Evgeniya Kravchenko, Giuseppe Maccaferri, Alexey Melnikov, Kotaro Niinuma, Monica Orienti,..., Akihiro Doi, et al.
- Journal Title
  
  Galaxies
  
  Volume: 11 Issue: 2 Pages: 49-49
- DOI
  10.3390/galaxies11020049
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-20K04020, KAKENHI-PROJECT-21K03618, KAKENHI-PROJECT-21K03628, KAKENHI-PROJECT-22H00157
[Journal Article] A Search for Pulsars around Sgr A* in the First Event Horizon Telescope Data Set2023
- Author(s)
  Torne Pablo、Liu Kuo、Eatough Ralph P.、et al.
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 959 Issue: 1 Pages: 14-14
- DOI
  10.3847/1538-4357/acf4f2
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03448, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-18K13594
[Journal Article] Polarimetric Geometric Modeling for mm-VLBI Observations of Black Holes2023
- Author(s)
  Roelofs Freek、Johnson Michael D.、Chael Andrew、et al.
- Journal Title
  
  The Astrophysical Journal Letters
  
  Volume: 957 Issue: 2 Pages: L21-L21
- DOI
  10.3847/2041-8213/acff6f
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03448, KAKENHI-PROJECT-23K03453, KAKENHI-PROJECT-18K13594
[Journal Article] Collimation of the Relativistic Jet in the Quasar 3C 2732022
- Author(s)
  Okino Hiroki、Akiyama Kazunori、Asada Keiichi、Gomez Jose L.、Hada Kazuhiro、Honma Mareki、Krichbaum Thomas P.、Kino Motoki、Nagai Hiroshi、Bach Uwe、Blackburn Lindy、Bouman Katherine L.、et al.
- Journal Title
  
  The Astrophysical Journal
  
  Volume: 940 Issue: 1 Pages: 65-65
- DOI
  10.3847/1538-4357/ac97e5
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03709, KAKENHI-PROJECT-21H04488, KAKENHI-PROJECT-22H00157
[Presentation] Study of Jet Collimation Profile in TeV Blazar Markarian 5012023
- Author(s)
  Shoko Koyama
- Organizer
  East Asia To Italy: Nearly Global VLBI
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03453
[Presentation] Breaking the degeneracy in blazar physics through EHT + multi-wavelength data of Mrk 5012023
- Author(s)
  Shoko Koyama
- Organizer
  EHT Collaboration Meeting Summer 2023
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03453
[Presentation] EAVN/VERA 86GHz帯を用いた巨大ブラックホールの観測に向けて2023
- Author(s)
  秦和弘、小川英夫、小山翔子、新沼浩太郎、他
- Organizer
  2023年日本天文学会春季年会
- Data Source
  KAKENHI-PROJECT-22H00157
[Presentation] Science Council updates and mid-range science goals overview2023
- Author(s)
  Shoko Koyama
- Organizer
  EHT Collaboration Meeting Summer 2023
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03453
[Presentation] VERA-upgrade for EAVN and GVLBI 計画の進捗VI : K-band RF Direct A/D2023
- Author(s)
  小山友明、秦和弘、鈴木駿策、砂田和良、他
- Organizer
  2023年日本天文学会春季年会
- Data Source
  KAKENHI-PROJECT-22H00157
[Presentation] Study of Jet Collimation Profile in TeV Blazar Markarian 5012023
- Author(s)
  Shoko Koyama
- Organizer
  Bologna VLBI Life begins at 40!
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K03453
[Presentation] 水沢・石垣20 m望遠鏡への搭載に向けた 86 GHz帯受信機の開発2022
- Author(s)
  亀山晃、小川英夫、秦和弘、鈴木駿策、小山友明、砂田和良、他
- Organizer
  2022年度 VLBI懇談会シンポジウム
- Data Source
  KAKENHI-PROJECT-22H00157
[Presentation] 水沢VERA20 m望遠鏡搭載に向けた67-116 GHz帯2SB回路の検討2022
- Author(s)
  亀山晃、小川英夫、秦和弘、鈴木駿策、小山友明、砂田和良、他
- Organizer
  2022年日本天文学会秋季年会
- Data Source
  KAKENHI-PROJECT-22H00157
[Presentation] 86GHz帯EAVNに向けたVERA水沢局86GHz常温受信機搭載と試験2022
- Author(s)
  秦和弘、小川英夫、小山友明、鈴木駿策、砂田和良、他
- Organizer
  2022年度 VLBI懇談会シンポジウム
- Data Source
  KAKENHI-PROJECT-22H00157

1. 秦和弘 (60724458)

# of Collaborated Projects: 1 results

# of Collaborated Products: 5 results
2. 小川英夫 (20022717)

# of Collaborated Projects: 1 results

# of Collaborated Products: 4 results
3. 新沼浩太郎 (30434260)

# of Collaborated Projects: 1 results

# of Collaborated Products: 1 results
4. 紀基樹 (70531234)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
5. SASADA MAHITO

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
6. NAGAI Hiroshi

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
7. 本間希樹

# of Collaborated Projects: 0 results

# of Collaborated Products: 4 results
8. 池田思朗

# of Collaborated Projects: 0 results

# of Collaborated Products: 2 results
9. 西嶋恭司

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
10. 櫛田淳子

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
11. 土居明広

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Koyama Shoko 小山 翔子

Research Projects

Research Products

Co-Researchers

Understanding the formation mechanism of high-energy gamma-ray emission with global milimeter VLBI observationsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Understanding the formation mechanisms of supermassive black holes jets using high-resolution and high-cadence millimeter VLBI observations

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

[Journal Article] The persistent shadow of the supermassive black hole of M 87. I. Observations, calibration, imaging, and analysis2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] TELAMON: Effelsberg monitoring of AGN jets with very-high-energy astroparticle emission2024

Author(s)

Journal Title

DOI

Data Source

[Journal Article] First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] The Greenland Telescope?Construction, Commissioning, and Operations in Pituffik2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Comparison of Polarized Radiative Transfer Codes Used by the EHT Collaboration2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] A ring-like accretion structure in M87 connecting its black hole and jet2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Multimessenger Characterization of Markarian 501 during Historically Low X-Ray and γ-Ray Activity2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Spectral analysis of a parsec-scale jet in M 87: Observational constraint on the magnetic field strengths in the jet2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] The Past and Future of East Asia to Italy: Nearly Global VLBI2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] A Search for Pulsars around Sgr A* in the First Event Horizon Telescope Data Set2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Polarimetric Geometric Modeling for mm-VLBI Observations of Black Holes2023

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Collimation of the Relativistic Jet in the Quasar 3C 2732022

Author(s)

Journal Title

DOI

Data Source

[Presentation] Study of Jet Collimation Profile in TeV Blazar Markarian 5012023

Author(s)

Organizer

Data Source

Koyama Shoko 小山翔子