Cosmology & Astrophysics Group
Exploring the Universe through Gravitational Lensing and Galaxy Clusters
Our research group at Northeastern University develops and applies cutting-edge techniques to understand dark matter, galaxy clusters, and the large-scale structure of the universe through gravitational lensing observations from ground, stratosphere, and space.
About the PI

Professor Jacqueline McCleary is an observational cosmologist who uses galaxy clusters as a laboratory in which to explore the nature of dark matter and its interaction with galaxies. Her group develops tools to measure galaxy clusters' weak gravitational lensing: the small but coherent distortion of light from distant galaxies by massive foreground objects. Professor McCleary uses data from observatories on mountaintops, in the stratosphere, and in space. She is a collaborator in the Local Volume Complete Cluster Survey (LoVoCCS), the Superpressure Balloon-borne Imaging Telescope (SuperBIT), and COSMOS-Web (a JWST collaboration).
Jacqueline first joined the Department of Physics as a Northeastern ADVANCE Future Faculty Fellow before "graduating" to an assistant professorship in 2022. She has received an MS in astronomy from New Mexico State University, an MS and PhD in physics from Brown University, and was a post-doctoral fellow at NASA's Jet Propulsion Laboratory.
Our Research

Galaxy Cluster Cosmology from the Stratosphere
Leading weak gravitational lensing analysis of merging clusters observed with SuperBIT, a stratospheric NUV-to-NIR telescope. We're also developing GigaBIT, its successor mission.
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Gravitational Lensing with COSMOS-Web
Using JWST NIRCam and MIRI observations to characterize PSFs for gravitational lensing analysis and conduct cosmological parameter estimation using 3x2-point correlation functions.
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Circumgalactic Dust Halos
Exploring dust in the extended circumgalactic and intergalactic medium, studying its effects on distance estimates as a function of galaxy type.
Learn more →Our Team

Jacqueline McCleary
Principal Investigator
Assistant Professor, Department of Physics
Topics: weak gravitational lensing, galaxy clusters, cosmology

Sayan Saha
Postdoctoral Fellow
Topics: SuperBIT, lensing analysis, CMB lensing

Bryanne McDonough
Postdoctoral Fellow
Topics: computational astrophysics, galaxy evolution

Eric Habjan
PhD Student
Topics: galaxy clusters, data science, ionized gas

Eddie Berman
Undergraduate Student
Topics: COSMOS-Web, computational imaging, adaptive optics
Recent Publications
On Soft Clustering For Correlation Estimators: Model Uncertainty, Differentiability, and Surrogates
arXiv preprint arXiv:2504.06174
The COSMOS-Web Lens Survey (COWLS) I: Discovery of> 100 high redshift strong lenses in contiguous JWST imaging
arXiv preprint arXiv:2503.08777
The COSMOS-Web Lens Survey (COWLS) II: depth, resolution, and NIR coverage from JWST reveal 17 spectacular lenses
arXiv preprint arXiv:2503.08782