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Dr Qianjun Hang
Room 229, North West Wing
Dept. Physics and Astronomy, UCL, Gower Street
Dr Qianjun Hang profile picture
  • Research Fellow
  • Dept of Physics & Astronomy
  • Faculty of Maths & Physical Sciences
  • PhD in Cosmology, supervisor: John Peacock, Edinburgh University (2021)
  • Integrated Masters in Mathmatical and Theoretical Physics, Oxford University (2017)
Research Groups
Research Summary
I am interested in how the large scale structures of the Universe are formed and evolved, and what this can tell us about our understanding of cosmology. To do this, I have used the DESI Legacy Imaging Survey and the Planck 2018 Cosmic Microwave Background (CMB) to measure the Integrated Sachs-Wolfe (ISW) and the CMB lensing effects. I also measured these signals coming from large "superstructures" - large peaks and troughs from the galaxy density maps, via the stacking technique. In addition, I used GAMA survey to measure the redshift-space distortion (RSD) effect from the group-galaxy cross-correlation function, with several subsamples of different galaxy properties. 

Currently, I am mainly involved in the LSST DESC photometric redshift working group, quantifying possible systematics that could potentially bias the cosmological measurements. Specifically, I am investigating the impact of non-uniformity in survey conditions on the mean redshifts of the tomographic bins, as well as systematics in DESI x LSST redshift calobration. In addition, I am looking at what we can learn about galaxy bias of the superstructures using the Dark Energy Survey (DES) Y3 mass map and redMaGiC galaxies.

Teaching Summary
I have co-supervised a MSci thesis on using simulation to measure the ISW effect. I was the teaching assistent for PHAS0011 (Modern Physics, Astronomy, and Cosmology), and currently, I am the demonstrator for PHAS0020 (Practical Astrophysics and Computing).
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