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An Independent Test of the Hubble Constant Tension with Time-Delay Cosmography

Research Project

Project/Area Number 20K14511
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 16010:Astronomy-related
Research InstitutionThe University of Tokyo (2020, 2023)
National Astronomical Observatory of Japan (2021-2022)

Principal Investigator

WONG Kenneth  東京大学, 大学院理学系研究科(理学部), 特任助教 (00794207)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordscosmology / gravitational lensing / extragalactic astronomy / astrophysics
Outline of Research at the Start

My research uses strong gravitational lensing, a phenomenon where the gravity of a massive galaxy creates multiple images of a background object, to measure the expansion rate of the Universe. There is a growing discrepancy between different measurements of this expansion rate, depending on whether the measurement comes from observations of the early Universe (just after the Big Bang) or the late Universe (closer to the present time). Gravitational lensing provides an independent late-Universe measurement, and thus is a crucial test of whether this discrepancy may lead to new physics.

Outline of Final Research Achievements

My research primarily focuses on using strong gravitational lensing (the deflection of light rays by gravity) to study the physical properties of our Universe. By using strongly-lensed images of distant quasars, I worked to constrain the expansion rate of the Universe. This value, called the "Hubble constant", is highly debated, and has important implications for our understanding of physics. I have been working as part of the TDCOSMO collaboration, which has provided the most precise measurement of the Hubble constant using strong gravitational lensing to date. In addition, I have been a leader of the strong lensing working group for the Subaru Hyper Suprime-Cam survey. This large imaging survey provides a great opportunity to search for new strong lenses for a variety of science goals. I have worked on lens searches in the HSC survey using both traditional algorithms and new machine-learning approaches, helping to discover hundreds of new gravitational lenses.

Academic Significance and Societal Importance of the Research Achievements

The expansion rate of the Universe has major implications for its age, energy content, and future. My research using gravitational lensing to calculate the expansion rate provides a key independent measurement to check for error in other methods, which have been in tension with each other.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (57 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (22 results) Journal Article (23 results) (of which Int'l Joint Research: 23 results,  Peer Reviewed: 22 results,  Open Access: 7 results) Presentation (9 results) (of which Int'l Joint Research: 8 results,  Invited: 6 results) Remarks (3 results)

  • [Int'l Joint Research] Max Planck Institute for Astrophysics(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] UCLA/UC Davis/University of Chicago(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] EPFL(スイス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] University of Liege(ベルギー)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] IUCAA(インド)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Max Planck Institute for Astrophysics(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] UCLA/UC Davis/Stanford/KIPAC(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] EPFL(スイス)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Liege(ベルギー)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] IUCAA(インド)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Max Planck Institute for Astrophysics(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] UCLA/UC Davis/Stanford/KIPAC(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] EPFL(スイス)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Liege(ベルギー)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] IUCAA(インド)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Max Planck Institute for Astrophysics(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] UCLA/UC Davis/Stanford/KIPAC(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] EPFL(スイス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] University of Liege(ベルギー)

    • Related Report
      2020 Research-status Report
  • [Journal Article] A Bayesian approach to strong lens finding in the era of wide-area surveys2024

    • Author(s)
      Holloway Philip、Marshall Philip J、Verma Aprajita、More Anupreeta、Canameras Raoul、Jaelani Anton T、Ishida Yuichiro、Wong Kenneth C
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 530 Issue: 2 Pages: 1297-1310

    • DOI

      10.1093/mnras/stae875

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Survey of gravitationally lensed objects in HSC imaging (SuGOHI) - IX. Discovery of strongly lensed quasar candidates2023

    • Author(s)
      Chan James H H、Wong Kenneth C、Ding Xuheng、Chao Dani、Chiu I-Non、Jaelani Anton T、Kayo Issha、More Anupreeta、Oguri Masamune、Suyu Sherry H
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 527 Issue: 3 Pages: 6253-6275

    • DOI

      10.1093/mnras/stad2953

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] MMT/Binospec Spectroscopic Survey of Two z=0.8 Galaxy Clusters in the Eye of Horus Field2023

    • Author(s)
      Di, Jiyun ; Egami, Eiichi ; Wong, Kenneth C. ; Lee, Chien-Hsiu ; Ning, Yuanhang ; Ota, Naomi ; Tanaka, Masayuki
    • Journal Title

      The Astrophysical Journal

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI) - X. Strong Lens Finding in The HSC-SSP using Convolutional Neural Networks2023

    • Author(s)
      Jaelani, Anton T.; More, Anupreeta ; Wong, Kenneth C. ; Inoue, Kaiki T. ; Chao, Dani C. -Y. ; Premadi, Premana W. ; Canameras, Raoul
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Survey of Gravitationally lensed objects in HSC Imaging (SuGOHI). VIII. New galaxy-scale lenses from the HSC?SSP2022

    • Author(s)
      Wong Kenneth C、Chan James H H、Chao Dani C-Y、Jaelani Anton T、Kayo Issha、Lee Chien-Hsiu、More Anupreeta、Oguri Masamune
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 74 Issue: 5 Pages: 1209-1219

    • DOI

      10.1093/pasj/psac065

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] TDCOSMO. IX. Systematic comparison between lens modelling software programs: time delay prediction for WGD 2038-40082022

    • Author(s)
      Shajib A. J.、Wong K. C.、Birrer S.、Suyu S. H.、Treu T.、Buckley-Geer E. J.、Lin H.、Rusu C. E.、Poh J.、Palmese A.、Agnello A.、Auger-Williams M. W.、Galan A.、Schuldt S.、Sluse D.、Courbin F.、Frieman J.、Millon M.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 667 Pages: A123-A123

    • DOI

      10.1051/0004-6361/202243401

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A star from the dawn of the Universe2022

    • Author(s)
      Wong Kenneth C.
    • Journal Title

      Nature Astronomy

      Volume: 6 Issue: 5 Pages: 527-528

    • DOI

      10.1038/s41550-022-01674-3

    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Journal Article] Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). VIII. New galaxy-scale lenses from the HSC SSP2022

    • Author(s)
      Wong Kenneth C.; et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] TDCOSMO. IX. Systematic comparison between lens modelling software programs: time delay prediction for WGD 2038-40082022

    • Author(s)
      Shajib, Anowar J.; Wong, Kenneth. C.; Birrer, Simon; Suyu, Sherry. H.; Treu, Tommaso; Buckley-Geer, Elizabeth; Lin, Huam; Rusu, Cristian. E.; Poh, Jason; Palmese, Antonella; Agnello, Adriano; Auger, Matthew W.; Galan, Aymeric.; Schuldt, Stefan; Sluse, Dominique; Courbin, Frederic; Frieman, Josh; Millon, Martin
    • Journal Title

      Astronomy & Astrophysics

      Volume: -

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Survey of Gravitationally Lensed Objects in HSC Imaging (SuGOHI) VII. Discovery and confirmation of three strongly lensed quasars2021

    • Author(s)
      Jaelani Anton T、Rusu Cristian E、Kayo Issha、More Anupreeta、Sonnenfeld Alessandro、Silverman John D、Schramm Malte、Anguita Timo、Inada Naohisa、Kondo Daichi、Schechter Paul L、Lee Khee-Gan、Oguri Masamune、Chan James H H、Wong Kenneth C、Inoue Kaiki T
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 502 Issue: 1 Pages: 1487-1493

    • DOI

      10.1093/mnras/stab145

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] H0LiCOW - XIII. A 2.4 per cent measurement of H0 from lensed quasars: 5.3σ tension between early- and late-Universe probes2020

    • Author(s)
      Wong Kenneth C、et al.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 498 Issue: 1 Pages: 1420-1439

    • DOI

      10.1093/mnras/stz3094

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI)2020

    • Author(s)
      Chan James H. H.、Suyu Sherry H.、Sonnenfeld Alessandro、Jaelani Anton T.、More Anupreeta、Yonehara Atsunori、Kubota Yuriko、Coupon Jean、Lee Chien-Hsiu、Oguri Masamune、Rusu Cristian E.、Wong Kenneth C.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 636 Pages: A87-A87

    • DOI

      10.1051/0004-6361/201937030

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Discovery of an unusually compact lensed Lyman-break galaxy from the Hyper Suprime-Cam Survey2020

    • Author(s)
      Jaelani Anton T、More Anupreeta、Sonnenfeld Alessandro、Oguri Masamune、Rusu Cristian E、Wong Kenneth C、Chan James H H、Suyu Sherry H、Kayo Issha、Lee Chien-Hsiu、Inoue Kaiki T
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 494 Issue: 3 Pages: 3156-3165

    • DOI

      10.1093/mnras/staa583

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-53542020

    • Author(s)
      Shajib A J, et al. (incl. Wong Kenneth C)
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 494 Issue: 4 Pages: 6072-6102

    • DOI

      10.1093/mnras/staa828

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI) ? V. Group-to-cluster scale lens search from the HSC?SSP Survey2020

    • Author(s)
      Jaelani Anton T、More Anupreeta、Oguri Masamune、Sonnenfeld Alessandro、Suyu Sherry H、Rusu Cristian E、Wong Kenneth C、Chan James H H、Kayo Issha、Lee Chien-Hsiu、Chao Dani C-Y、Coupon Jean、Inoue Kaiki T、Futamase Toshifumi
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 495 Issue: 1 Pages: 1291-1310

    • DOI

      10.1093/mnras/staa1062

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cosmic dissonance: are new physics or systematics behind a short sound horizon?2020

    • Author(s)
      Arendse Nikki、Wojtak Radoslaw J.、Agnello Adriano、Chen Geoff C.-F.、Fassnacht Christopher D.、Sluse Dominique、Hilbert Stefan、Millon Martin、Bonvin Vivien、Wong Kenneth C.、Courbin Frederic、Suyu Sherry H.、Birrer Simon、Treu Tommaso、Koopmans Leon V. E.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 639 Pages: A57-A57

    • DOI

      10.1051/0004-6361/201936720

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] TDCOSMO2020

    • Author(s)
      Millon M., et al. (incl. Wong Kenneth C)
    • Journal Title

      Astronomy & Astrophysics

      Volume: 639 Pages: A101-A101

    • DOI

      10.1051/0004-6361/201937351

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI)2020

    • Author(s)
      Sonnenfeld Alessandro, et al. (incl. Wong Kenneth C)
    • Journal Title

      Astronomy & Astrophysics

      Volume: 642 Pages: A148-A148

    • DOI

      10.1051/0004-6361/202038067

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] H0LiCOW - XI. A weak lensing measurement of the external convergence in the field of the lensed quasar B1608+656 using HST and Subaru deep imaging2020

    • Author(s)
      Tihhonova O、Courbin F、Harvey D、Hilbert S、Peel A、Rusu C E、Fassnacht C D、Bonvin V、Marshall P J、Meylan G、Sluse D、Suyu S H、Treu T、Wong K C
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 498 Issue: 1 Pages: 1406-1419

    • DOI

      10.1093/mnras/staa1436

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] H0LiCOW XII. Lens mass model of WFI2033-4723 and blind measurement of its time-delay distance and H02020

    • Author(s)
      Rusu Cristian E、Wong Kenneth C、Bonvin Vivien、Sluse Dominique、Suyu Sherry H、Fassnacht Christopher D、Chan James H H、Hilbert Stefan、Auger Matthew W、Sonnenfeld Alessandro、Birrer Simon、Courbin Frederic、Treu Tommaso、Chen Geoff C-F、Halkola Aleksi、Koopmans Leon V E、Marshall Philip J、Shajib Anowar J
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 498 Issue: 1 Pages: 1440-1468

    • DOI

      10.1093/mnras/stz3451

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] TDCOSMO2020

    • Author(s)
      Birrer S., et al. (incl. Wong Kenneth C)
    • Journal Title

      Astronomy & Astrophysics

      Volume: 643 Pages: A165-A165

    • DOI

      10.1051/0004-6361/202038861

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] STRIDES: Spectroscopic and photometric characterization of the environment and effects of mass along the line of sight to the gravitational lenses DES J0408-5354 and WGD 2038-40082020

    • Author(s)
      Buckley-Geer E J、et al. (incl. Wong Kenneth C)
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 498 Issue: 3 Pages: 3241-3274

    • DOI

      10.1093/mnras/staa2563

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Testing the evolution of correlations between supermassive black holes and their host galaxies using eight strongly lensed quasars2020

    • Author(s)
      Ding Xuheng、Treu Tommaso、Birrer Simon、Agnello Adriano、Sluse Dominique、Fassnacht Chris、Auger Matthew W、Wong Kenneth C、Suyu Sherry H、Morishita Takahiro、Rusu Cristian E、Galan Aymeric
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 501 Issue: 1 Pages: 269-280

    • DOI

      10.1093/mnras/staa2992

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Systematic comparison of neural networks to search for gravitational lenses in the HSC SSP2023

    • Author(s)
      Kenneth Wong
    • Organizer
      2023 Asia-Pacific Regional IAU Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Measurement of the Hubble Constant from Lensed Quasars2023

    • Author(s)
      Kenneth Wong
    • Organizer
      14th RESCEU Symposium: From Large to Small Structures in the Universe
    • Related Report
      2023 Annual Research Report
  • [Presentation] An Independent Measurement of H0 from Lensed Quasars2022

    • Author(s)
      Kenneth Wong
    • Organizer
      Exploring the Dark Universe
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] An Independent Measurement of the Hubble Constant from Lensed Quasars2022

    • Author(s)
      Kenneth Wong
    • Organizer
      Gravity: Current challenges in black hole physics and cosmology
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] TDCOSMO: Lens modelling software comparison and time delay prediction for WGD 2038-40082022

    • Author(s)
      Kenneth Wong
    • Organizer
      International Astronomical Union XXXIst General Assembly
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Measurement of the Hubble Constant from Lensed Quasars2022

    • Author(s)
      Kenneth Wong
    • Organizer
      Astronomical Society of Japan Spring 2022 Annual Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Measurement of the Hubble Constant from Lensed Quasars2022

    • Author(s)
      Kenneth Wong
    • Organizer
      Exploring the Dark Universe
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] An Independent Measurement of H0 from Lensed Quasars2020

    • Author(s)
      Kenneth Wong
    • Organizer
      American Physical Society Virtual Meeting April 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] An Independent Measurement of H0 from Lensed Quasars2020

    • Author(s)
      Kenneth Wong
    • Organizer
      Assessing uncertainties in Hubble’s constant across the Universe
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] TDCOSMO

    • URL

      https://obswww.unige.ch/~lemon/tdcosmo-master/index.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] SuGOHI Candidate List

    • URL

      https://www-utap.phys.s.u-tokyo.ac.jp/~oguri/sugohi/

    • Related Report
      2023 Annual Research Report
  • [Remarks] TDCOSMO

    • URL

      http://www.tdcosmo.org/

    • Related Report
      2022 Research-status Report 2021 Research-status Report 2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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