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

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

Stratospheric observations

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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COSMOS-Web

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

Circumgalactic Dust Halos

Exploring dust in the extended circumgalactic and intergalactic medium, studying its effects on distance estimates as a function of galaxy type.

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Our Team

Jacqueline McCleary

Jacqueline McCleary

Principal Investigator

Assistant Professor, Department of Physics

Topics: weak gravitational lensing, galaxy clusters, cosmology

Sayan Saha

Sayan Saha

Postdoctoral Fellow

Topics: SuperBIT, lensing analysis, CMB lensing

Bryanne McDonough

Bryanne McDonough

Postdoctoral Fellow

Topics: computational astrophysics, galaxy evolution

Eric Habjan

Eric Habjan

PhD Student

Topics: galaxy clusters, data science, ionized gas

Eddie Berman

Eddie Berman

Undergraduate Student

Topics: COSMOS-Web, computational imaging, adaptive optics

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Recent Publications

2025

On Soft Clustering For Correlation Estimators: Model Uncertainty, Differentiability, and Surrogates

E. Berman, S. Pandya, J. McCleary, M. Shuntov, C. Casey, N. Drakos, et al.

arXiv preprint arXiv:2504.06174

methods clustering cosmology
2025

The COSMOS-Web Lens Survey (COWLS) I: Discovery of> 100 high redshift strong lenses in contiguous JWST imaging

J. Nightingale, G. Mahler, J. McCleary, Q. He, N.B. Hogg, A. Amvrosiadis, et al.

arXiv preprint arXiv:2503.08777

lensing JWST COSMOS-Web
2025

The COSMOS-Web Lens Survey (COWLS) II: depth, resolution, and NIR coverage from JWST reveal 17 spectacular lenses

G. Mahler, J.W. Nightingale, N.B. Hogg, G. Gozaliasl, J. McCleary, Q. He, et al.

arXiv preprint arXiv:2503.08782

lensing JWST COSMOS-Web
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