UCSB Astrophysics
Portrait of Caitlin Casey

§ 01People · Faculty

Caitlin Casey

Professor; Vice Chair for Undergraduate Affairs

Caitlin Casey is an observational astronomer. She studies how the most massive galaxies assembled in the early universe and uses these rare galaxies to test how gas, stars and dust come together within the standard cosmological model. Her work uses JWST, ALMA and Keck Observatory, along with radio and submillimeter data that measure cold gas and dust at early times.

She is one of the principal investigators of the COSMOS survey, a two square degree deep field, and of COSMOS-Web, its JWST component. COSMOS-Web received the largest allocation of public JWST time in the telescope’s first year. She also studies forming galaxy clusters and weak lensing.

She received her PhD from Cambridge in 2010 and the AAS Newton Lacy Pierce Prize in 2018. From 2015 to 2024 she was on the UT Austin faculty, and she joined UCSB in 2025.

§ 02Fig. 1

Where in the universe

Range 3.2 Gly to 13.2 Gly

Caitlin Casey, row of Fig. 1. The bar spans the light travel distances of the objects studied, 3.2 Gly to 13.2 Gly, on a logarithmic axis from the Solar System to the cosmic microwave background. Its two colors are the two research themes. Dotted lines mark landmarks. Fig. 1 with every faculty member

§ 03Publications

Recent papers

The newest papers with Caitlin Casey as an author, from NASA ADS. Group members are in gold.

  1. 01Oct 2026arXiv
    The Role of the Cosmic Web in Galaxy Evolution Across 0.4<z<4S. Taamoli, B. Mobasher, H. Hatamnia, N. Chartab, J. R. Weaver, G. Gozaliasl, A. M. Koekemoer, C. M. Casey et al. (15 authors)GalaxiesCosmic dawn
    arXiv:2610.07710
  2. 02Oct 2026arXiv
    X-ray Characterization of Galaxy Groups and Hickson Groups in COSMOS-Web to z~3.8 I. X-ray Luminosity Function EvolutionG. Gozaliasl, G. Hasinger, G. Leroy, A. Finoguenov, F. Abedini, H. B. Akins, R. C. Arango-Toro, A. Babul et al. (38 authors); UCSB: C. M. CaseyGalaxiesCosmic dawn
    arXiv:2610.02470
  3. 03Oct 2026arXiv
    Do Submillimeter Galaxies Trace Megaparsec Large-scale Structures? -- An Overdensity Analysis of 449 Submillimeter Galaxies in COSMOSC. Deng, D. Liu, H. Dannerbauer, G. Castignani, R. Calvi, L. Moscardini, B. Magnelli, S. Adscheid et al. (22 authors); UCSB: C. CaseyGalaxiesCosmic dawn
    arXiv:2610.01136
  4. 04Sep 2026arXiv
    CHAMPS: Data Reduction and Detection of ~3300 Dusty Galaxies at 1.2 mmF. Martinez, J. S. Karaltepe, A. L. Faisst, A. S. Long, J. A. Zavala, C. M. Casey, J. McKinney, E. Treister et al. (55 authors)GalaxiesCosmic dawn
    arXiv:2609.36076
  5. 05Sep 2026arXiv
    CHAMPS: The COSMOS High-Redshift ALMA-MIRI Population Survey - A New Census of the Dusty Early UniverseA. L. Faisst, F. Martinez, J. S. Kartaltepe, M. Aravena, C. M. Casey, J. D. Silverman, S. Toft, E. Treister et al. (89 authors); UCSB: C. L. MartinGalaxiesCosmic dawn
    arXiv:2609.35992
  6. 06Sep 2026arXiv
    COSMOS-3D: Diverse Environments and Hot-dust Signatures among Dusty Star-forming Galaxies at z = 4.9-7.2S. Zou, M. Aravena, S. Geng, R. A. Meyer, J. Lyu, J. B. Champagne, J.-S. Huang, A. L. Faisst et al. (23 authors); UCSB: C. M. CaseyGalaxiesCosmic dawn
    arXiv:2609.35987
  7. 07Sep 2026arXiv
    Calcium Triplet Absorption is Common around Little Red DotsJ. E. Greene, H. Liu, R. E. Hviding, R. P. Naidu, D. J. Setton, B. Wang, I. Labbe, V. Kokorev et al. (32 authors); UCSB: C. M. CaseyGalaxiesCosmic dawn
    arXiv:2609.25349
  8. 08Sep 2026arXiv
    Star Formation and Nebular Attenuation from Paα, Brα, and Brβ in Massive Dust-obscured Galaxies at Cosmic Noon using JWSTV. Vanicek, J. McKinney, A. Pope, A. Sajina, S. Alberts, M. Stone, L. Armus, S. M. Manning et al. (17 authors); UCSB: C. CaseyGalaxiesCosmic dawn
    arXiv:2609.22428
  9. 09Sep 2026arXiv
    ALMA Chemical Evolution (ACE) survey: an overview -- extending dust and gas inference to low metallicities at cosmic noonI. Shivaei, G. Popping, L. A. Boogaard, A. Pope, I. Langan, R. Popescu, N. N. Geesink, M. Solimano et al. (16 authors); UCSB: C. M. CaseyGalaxiesCosmic dawn
    arXiv:2609.21604
  10. 10Sep 2026arXiv
    A large overdensity of LRD-like galaxies discovered by JWST in the SPT2349-56 protocluster at z=4.30S. C. Chapman, K. A. Phadke, N. Sulzenauer, D. Zhou, H. Akins, M. Aravena, J. R. Burgoyne, C. M. Casey et al. (23 authors)GalaxiesCosmic dawn
    arXiv:2609.21337

All papers by Caitlin Casey

Everyone in the group