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

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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).