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<!DOCTYPE HTML>
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<title>Qianjun Hang</title>
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<h1>Qianjun Hang</h1>
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<p>
Postdoctoral Research Fellow<br>
Department of Physics & Astronomy<br>
University College London
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<a href="CV/QianjunHang_CV.pdf" target="_blank">Curriculum Vitae</a>
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<li><a href="#about">About</a></li>
<li><a href="#research">Research</a></li>
<li><a href="#publications">Publications</a></li>
<li><a href="#service">Service</a></li>
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<h2 class="major">About Me</h2>
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<p>
I am a Postdoctoral Research Fellow in the Department of Physics &
Astronomy at University College London (UCL), where I have been based since
June 2021. I completed my PhD in Cosmology at the University of Edinburgh,
supervised by John Peacock, and was awarded the
<b>Winton Prize for the best PhD thesis in Astronomy</b> and the Scottish
University Physics Alliance Prize Studentship. I previously studied MMathPhys
at the University of Oxford.
</p>
<p>
<b>Research Interests:</b> My research sits at the intersection of
observational cosmology and large galaxy surveys. I work on photometric
redshift estimation and calibration, large-scale structure, weak gravitational
lensing, galaxy–CMB cross-correlations, and tests of early-Universe physics
using ultra-large-scale clustering. I am also interested in beyond two-point
statistics, including cosmic voids and higher-order probes. I am involved in
major surveys including LSST/Rubin, DESI, DES, and Euclid.
</p>
<p>
<b>Full publication list:</b>
<a href="https://ui.adsabs.harvard.edu/search/filter_database_fq_database=AND&filter_database_fq_database=database%3A%22astronomy%22&fq=%7B!type%3Daqp%20v%3D%24fq_database%7D&fq_database=(database%3A%22astronomy%22)&p_=0&q=author%3A%22Hang%2C%20Qianjun%22&sort=date%20desc%2C%20bibcode%20desc">
NASA ADS
</a>
</p>
</article>
<!-- ══════════════════════════════════ RESEARCH ══ -->
<article id="research">
<h2 class="major">Research</h2>
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<p>
<b>Calibrating redshift distributions at z > 2 with Lyman-α forests</b><br>
Accurate photometric redshift (photo-z) calibration is critical for upcoming
surveys like LSST. I developed a method to calibrate high-redshift tail of
galaxy redshift distributions using cross-correlations with Lyman-α forests
from quasar spectra, extending clustering-based calibration beyond z~2 where
traditional spectroscopic overlap breaks down.
<a href="https://doi.org/10.1093/mnras/stag497">MNRAS (2026)</a>
</p>
<p>
<b>RAIL: Redshift Assessment Infrastructure Layers</b><br>
As co-lead of the RAIL topical team within LSST DESC, I contribute to the
infrastructure software for photometric redshift estimation and validation for
the Rubin Observatory era. RAIL provides a modular, community-maintained
framework for stress-testing photo-z algorithms at scale across simulated and
real datasets.
<a href="https://doi.org/10.33232/001c.158200">OJAp (2026)</a>
</p>
<p>
<b>Impact of survey spatial variability on redshift distributions for LSST</b><br>
I studied how spatial survey systematics — depth variations, stellar density,
seeing — bias estimated galaxy redshift distributions and propagate into
cosmological 3×2-point analyses, with direct implications for how LSST data
must be processed.
<a href="https://doi.org/10.1093/mnras/stae2312">MNRAS (2024)</a>
</p>
<p>
<b>Galaxy trough and peak profiles with DES Year 3</b><br>
I measured trough and peak profiles — underdense and overdense lines of sight —
using DES Y3 redMaGiC galaxies and the weak lensing mass map, providing new
constraints on galaxy bias and the matter distribution beyond standard
two-point functions.
<a href="https://doi.org/10.1093/mnras/stag006">MNRAS (2025)</a>
</p>
<p>
<b>Structure growth from CMB lensing: ACT DR6 × DESI Legacy Imaging</b><br>
In collaboration with the ACT team, I contributed to measurements of the
growth of cosmic structure from cross-correlations of DESI Legacy Imaging
galaxies with high-fidelity CMB lensing maps from ACT DR6 and Planck PR4.
<a href="https://doi.org/10.1103/PhysRevD.111.103503">PRD (2024)</a>
</p>
</article>
<!-- ══════════════════════════════════ PUBLICATIONS ══ -->
<article id="publications">
<h2 class="major">Publications</h2>
<p>
Full list: <a href="https://ui.adsabs.harvard.edu/search/filter_database_fq_database=AND&filter_database_fq_database=database%3A%22astronomy%22&fq=%7B!type%3Daqp%20v%3D%24fq_database%7D&fq_database=(database%3A%22astronomy%22)&p_=0&q=author%3A%22Hang%2C%20Qianjun%22&sort=date%20desc%2C%20bibcode%20desc">NASA ADS</a>
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<h3>First-author papers</h3>
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<li>
<i>Calibrating redshift distribution at z > 2 with Lyman-α forest cross-correlations</i><br>
<b>Q. Hang</b>, L. Casas, W. d'Assignies, W. Turner, A. Font-Ribera, B. Joachimi<br>
MNRAS (2026) ·
<a href="https://doi.org/10.1093/mnras/stag497">DOI</a>
</li>
<li>
<i>Biasing from galaxy trough and peak profiles with the DES Y3 redMaGiC galaxies and the weak lensing mass map</i><br>
<b>Q. Hang</b> et al.<br>
MNRAS, 546 (2025) ·
<a href="https://doi.org/10.1093/mnras/stag006">DOI</a>
</li>
<li>
<i>Impact of survey spatial variability on galaxy redshift distributions and the cosmological 3×2-point statistics for LSST</i><br>
<b>Q. Hang</b> et al.<br>
MNRAS, 535, 2970 (2024) ·
<a href="https://doi.org/10.1093/mnras/stae2312">DOI</a>
</li>
<li>
<i>Galaxy and Mass Assembly (GAMA): Probing galaxy-group correlations in redshift space with the halo streaming model</i><br>
<b>Q. Hang</b>, J. A. Peacock, S. Alam, Y-C. Cai, K. Kraljic, M. van Daalen, M. Bilicki, B. W. Holwerda, J. Loveday<br>
MNRAS, 517, 1365 (2022) ·
<a href="https://arxiv.org/abs/2207.10414">arXiv</a>
</li>
<li>
<i>Stacked CMB lensing and ISW signal around super structures in the DESI Legacy Survey</i><br>
<b>Q. Hang</b>, S. Alam, Y. Cai, J. A. Peacock<br>
MNRAS, 507, 510 (2021) ·
<a href="https://arxiv.org/abs/2105.03409">arXiv</a>
</li>
<li>
<i>Galaxy clustering in the DESI Legacy Survey and its imprints on the CMB</i><br>
<b>Q. Hang</b>, S. Alam, J. A. Peacock, Y. Cai<br>
MNRAS, 501, 1481 (2021) ·
<a href="https://arxiv.org/abs/2010.00466">arXiv</a>
</li>
</ol>
<h3>Selected contributed papers</h3>
<ol>
<li>
<i>Redshift Assessment Infrastructure Layers (RAIL): Rubin-era photometric redshift stress-testing and at-scale production</i><br>
The RAIL Team et al. (incl. <b>Q. Hang</b> as corresponding author)<br>
OJAp, Vol. 9 (2026) ·
<a href="https://doi.org/10.33232/001c.158200">DOI</a>
</li>
<li>
<i>The Atacama Cosmology Telescope DR6 and DESI: Structure growth measurements from the cross-correlation of DESI Legacy Imaging galaxies and CMB lensing from ACT DR6 and Planck PR4</i><br>
F. J. Qu, <b>Q. Hang</b> et al.<br>
PRD, 111, 103503 (2024) ·
<a href="https://doi.org/10.1103/PhysRevD.111.103503">DOI</a>
</li>
<li>
<i>Propagating data-driven galaxy redshift distribution uncertainties in 3×2-pt analyses</i><br>
J. Ruiz-Zapatero, <b>Q. Hang</b>, Y. Zhang, B. Joachimi, J. Zuntz, and the LSST DESC<br>
In collaboration review
</li>
<li>
<i>Uniform Rolling: An LSST Observing Cadence Offering Sufficient Survey Uniformity for Comprehensive Cosmological Analysis</i><br>
B. Leistedt et al. (incl. <b>Q. Hang</b>)<br>
Submitted to ApJ Supplements
</li>
</ol>
</article>
<!-- ══════════════════════════════════ SERVICE ══ -->
<article id="service">
<h2 class="major">Service & Community</h2>
<span class="image main">
<img src="images/EagleNebula_Paladini_2854.jpg"
style="width:560px; height:200px; object-fit: cover;" alt=""/>
</span>
<p><b>Leadership in LSST DESC:</b></p>
<ul>
<li>Co-convenor, photometric redshift working group, LSST DESC (Jan 2026 – present)</li>
<li>Co-lead, RAIL topical team, LSST DESC (Jan 2024 – Dec 2025)</li>
<li>UK in-kind contributor to LSST DESC infrastructure and software development</li>
<li>Member, DESC EDI Committee (2026 – present)</li>
<li>Member, DESC Paper Review Committee (2025 – present)</li>
<li>Member, DESC Collaboration Council Nomination Committee (2024)</li>
<li>Member, DESC Scientific Organising Committee, July 2023 Collaboration Meeting</li>
</ul>
<p><b>Teaching & Supervision:</b></p>
<ul>
<li>Co-supervisor, PhD student, UCL (2025 – present)</li>
<li>Co-supervisor, MSc/MSci Astrophysics theses, UCL (2022, 2023, 2025, 2026)</li>
<li>Supervisor, MAPS summer studentship, UCL (2025)</li>
<li>Teaching Assistant (tutorials and computing labs), UCL (2022–2023)</li>
<li>Teaching Assistant (tutorials), University of Edinburgh (2017–2021)</li>
</ul>
<p><b>Other Community Roles:</b></p>
<ul>
<li>Panellist, Peer Review Panel, NASA Nancy Grace Roman Space Telescope (2023)</li>
<li>Organiser, London Cosmology Discussion Meeting and weekly seminar series</li>
<li>Postdoctoral Representative, Departmental EDI Committee, UCL</li>
</ul>
</article>
<!-- ══════════════════════════════════ CONTACT ══ -->
<article id="contact">
<h2 class="major">Contact</h2>
<p>
<b>Email:</b> e.hang@ucl.ac.uk
</p>
<p>
<b>Address:</b> Department of Physics & Astronomy, University College London,
Gower Street, London, UK, WC1E 6BT
</p>
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