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

时滞宇宙学对哈勃恒定张力的独立测试

• 批准号: 20K14511
• 负责人: Wong Kenneth
• 金额: $ 1.58万
• 依托单位: National Astronomical Observatory of Japan (2021-2022)The University of Tokyo (2020)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20K14511/
• 关键词: gravitational lensing; cosmology; extragalactic astronomy; astrophysics

In FY2022, I have had a refereed journal paper accepted for publication as the corresponding author (Wong et al. 2022, PASJ, 74, 1209), and I was one of the two primary authors of another accepted journal paper (Shajib et al. 2022, A&A, 667, 123). I was the second author on another submitted publication (Chan et al. 2023, MNRAS, submitted; arXiv:2304.05425).I primarily worked on the TDCOSMO project to measure the Hubble Constant (H0) using strong gravitational lensing time delays. I was one of two independent teams that modeled the lensed quasar system WGD 2038-4008, with the goal of evaluating systematic uncertainties associated with the choice of lens modeling codes. Our results (Shajib et al. 2022) show that the predicted time delays between the teams agree to within ~1-sigma. I also obtained spectroscopy using the Subaru telescope to measure redshifts of four lensed quasar galaxies to make these useful for cosmology in the future as part of the TDCOSMO sample.I am co-chair of the Hyper Suprime Cam SSP Strong Lensing Working Group. We have discovered hundreds of newly discovered strong lens candidates from the survey to date. I led a lens search through the latest HSC SSP data release (Wong et al. 2022) and discovered tens of new galaxy-scale lens candidates. I also mentored an undergraduate student, Yuichiro Ishida (Kyushu University), to develop a convolutional neural network (CNN) to search for lenses in HSC data. We will be on an upcoming publcation that compares the performance of different CNNs on a common test dataset (More et al., in preparation).

在2022财年，我有一篇经评审的期刊论文被接受作为通讯作者发表（Wong et al. 2022，PASJ，74，1209），我是另一篇被接受的期刊论文的两名主要作者之一（Shajib et al. 2022，A&A，667，123）。 我是另一个提交的出版物的第二作者（Chan et al. 2023，MNRAS，submitted; arXiv：2304.05425）。我主要从事TDCOSMO项目，使用强引力透镜时间延迟测量哈勃常数（H 0）。 我是模拟透镜类星体系统WGD 2038-4008的两个独立团队之一，目的是评估与透镜建模代码选择相关的系统不确定性。 我们的研究结果（Shajib et al. 2022）表明，团队之间的预测时间延迟在~1-sigma范围内。 我还获得了光谱使用斯巴鲁望远镜测量红移的四个透镜类星体星系，使这些有用的宇宙学在未来的TDCOSMO样本的一部分。我是联合主席的超超级凸轮SSP强透镜工作组。迄今为止，我们已经发现了数百个新发现的强透镜候选者。 我领导了一个透镜搜索，通过最新的HSC SSP数据发布（Wong et al. 2022），发现了数十个新的星系尺度透镜候选者。 我还指导了一名本科生Yuichiro Ishida（九州大学）开发了一个卷积神经网络（CNN）来搜索HSC数据中的镜片。 我们将在即将到来的研讨会上比较不同CNN在公共测试数据集上的性能（More等人，准备中）。

项目成果

TDCOSMO: IX. Systematic comparison between lens modelling software programs: Time-delay prediction for WGD 2038−4008

TDCOSMO：九。

• DOI: 10.1051/0004-6361/202243401
• 发表时间: 2022
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: 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.
• 通讯作者: Palmese, A.

Discovery of an unusually compact lensed Lyman-break galaxy from the Hyper Suprime-Cam Survey

• DOI: 10.1093/mnras/staa583
• 发表时间: 2019-08
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: A. Jaelani;A. More;A. Sonnenfeld;M. Oguri;C. Rusu;Kenneth C. Wong;J. Chan;S. Suyu;I. Kayo

University of Liege(ベルギー)

列日大学（比利时）

Max Planck Institute for Astrophysics(ドイツ)

马克斯·普朗克天体物理研究所（德国）

Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI)

• DOI: 10.1051/0004-6361/201937030
• 发表时间: 2019-11
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: J. Chan;S. Suyu;A. Sonnenfeld;A. Jaelani;A. More;A. Yonehara;Yuriko Kubota;J. Coupon;Chien-Hsiu L