COSMOS-Web (PID: 1727) is a 255 hour wide-field Cycle 1 JWST treasury program that maps a contiguous 0.6 deg2 area with deep NIRCam imaging in 4 filters (F115W, F150W, F277W, and F444W) and a non-contiguous 0.2 deg2 area with MIRI in parallel. COSMOS-Web builds on the rich heritage of multiwavelength observations and data products available in the COSMOS field, and will contain about a million galaxies across cosmic time. For more information, see survey Overview Paper or contact the survey PIs: Jeyhan Kartaltepe (jeyhan [at] astro [dot] rit [dot] edu) and Caitlin Casey (cmcasey [at] ucsb [dot] edu).
COSMOS-Web Primary Science Goals
The design of COSMOS-Web is motivated by three primary science goals:
1. Map Cosmic Reionization
2. Trace Massive Galaxy Evolution
3. Link Dark Matter to Visible Matter
Observing Strategy

NIRCam |
Exposure |
Short |
F115W |
F150W |
Long |
F277W |
F444W |
---|---|---|---|---|---|---|---|
1 | 257.68 | 71.3 | 26.87 | 27.14 | 17.8 | 27.71 | 27.61 |
2 | 515.36 | 991.6 | 27.13 | 27.35 | 978.0 | 27.99 | 27.83 |
3 | 773.05 | 60.0 | 27.26 | 27.50 | 24.4 | 28.12 | 27.94 |
4 | 1030.73 | 805.2 | 27.45 | 27.66 | 904.3 | 28.28 | 28.17 |

MIRI |
Exposure |
Area |
F770W Depth |
---|---|---|---|
2 | 527.26 | 80.5 | 25.33 |
4 | 1054.52 | 430.4 | 25.70 |
6 | 1581.77 | 30.8 | 25.76 |
8 | 2109.03 | 146.1 | 25.98 |
Community Downloads
Note that the Cycle 1 program, PRIMER (PID: 1837) observes the COSMOS-CANDELS region and is therefore embedded within COSMOS-Web.
Plans for Data Product Release
COSMOS-Web is being observed in three epochs (Epoch 1: Jan 5/6, 2023; Epoch 2: April/May 2023; Epoch 3: December 2023 / January 2024). Our tream is committed to the public release of initial mosaics 6 months after each epoch and catalogs after roughly one year.
Our first data was taken in January 2023 - see below for links to jpg images of these first data!
NIRCam: Full resolution image with and without logo
MIRI: Full resolution image with and without logo
See our data release page for links to all of our data releases!
Press Releases and News Articles
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COSMOS-Web selected as JWST’s largest Cycle 1 program
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First images released from James Webb Space Telescope’s largest general observer program
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COSMOS-Web Unveils Largest Look Ever Into the Deep Universe
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780,000 galaxies revealed in JWST’s largest science operation
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James Webb Space Telescope reveals largest-ever panorama of the early universe
- 1.5 TB of James Webb Space Telescope data just hit the internet
- Public gains unprecedented access to Webb telescope's vast cosmic survey
- Check out this interactive map of the early universe, considered largest ever created
Publications from the COSMOS-Web Team
- COSMOS-Web: An Overview of the JWST Cosmic Origins Survey, Casey, Kartaltepe et al. 2023, ApJ, 954, 31 [paper summary]
- Resolving Galactic-scale Obscuration of X-Ray AGNs at z ≳ 1 with COSMOS-Web, Silverman et al. 2023, ApJL, 951, 41
- A Near-Infrared Faint, Far-Infrared-Luminous Dusty Galaxy at z~5 in COSMOS-Web, McKinney et al. 2023, ApJ, 956, 72
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Two massive, compact, and dust-obscured candidate z~8 galaxies discovered by JWST, Akins et al. 2023, ApJL, 956, 61
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Uncovering a Massive z 7.7 Galaxy Hosting a Heavily Obscured Radio-loud Active Galactic Nucleus Candidate in COSMOS-Web, Lambrides et al. 2024, ApJL, 961, 25
- Unveiling the distant Universe: Characterizing z≥9 Galaxies in the first epoch of COSMOS-Web, Franco et al. 2024, ApJ, 973, 23
- Insights into Galaxy Morphology and Star Formation: Unveiling Filamentary Structures around an Extreme Overdensity at z ∼ 1.5 Traced by [O II] Emitters, Laishram et al. 2024, ApJL, 964, 33
- COSMOS-Web: Intrinsically Luminous z ≳ 10 Galaxy Candidates Test Early Stellar Mass Assembly, Casey et al. 2024, ApJ, 965, 98
- Tracing the rise of supermassive black holes. A panchromatic search for faint, unobscured quasars at z ≳ 6 with COSMOS-Web and other surveys, Andika et al. 2024, A&A, 685, 25
- JWST and ALMA Discern the Assembly of Structural and Obscured Components in a High-redshift Starburst Galaxy, Liu et al. 2024, ApJ, 968, 15
- COSMOS-Web: The over-abundance and physical nature of "little red dots"--Implications for early galaxy and SMBH assembly, Akins et al. 2024, ApJ, submitted
- The COSMOS-Web ring: In-depth characterization of an Einstein ring lensing system at z ∼ 2, Mercier et al. 2024, A&A, 687, 61
- The Web Epoch of Reionization Lyα Survey (WERLS). I. MOSFIRE Spectroscopy of z ∼ 7–8 Lyα Emitters, Cooper et al. 2024, ApJ, 970, 50
- Not-so-little Red Dots: Two Massive and Dusty Starbursts at z ∼ 5–7 Pushing the Limits of Star Formation Discovered by JWST in the COSMOS-Web Survey, Gentile et al. 2024, ApJ, 973, 2
- Efficient Point-spread Function Modeling with ShOpt.jl: A Point-spread Function Benchmarking Study with JWST NIRCam Imaging, Berman et al. 2024, AJ, 168, 174
- Crimson Behemoth: A massive clumpy structure hosting a dusty AGN at z=4.91, Tanaka et al. 2024, PASJ, 76, 1323
- Discovery of dual "little red dots" indicates excess clustering on kilo-parsec scales, Tanaka et al. 2024, PASJ, submitted
- Clumps as multiscale structures in cosmic noon galaxies, Kalita et al. 2025, MNRAS, 536, 3090
- Tracing the galaxy-halo connection with galaxy clustering in COSMOS-Web from z = 0.1 to z ~ 12, Paquereau et al. 2025, A&A, submitted
- The MBH–M∗ Relation up to z ∼ 2 through Decomposition of COSMOS-Web NIRCam Images, Tanaka et al. 2025, ApJ, 979, 215
- SCUBADive. I. JWST+ALMA Analysis of 289 Submillimeter Galaxies in COSMOS-Web, McKinney et al. 2025, ApJ, 979, 229
- A Multiwavelength Investigation of Spiral Structures in z > 1 Galaxies with JWST, Kalita et al. 2025, ApJ, 979L, 44
- COSMOS-Web: The Role of Galaxy Interactions and Disk Instabilities in Producing Starbursts at z < 4, Faisst et al. 2025, ApJ, 980, 204
- COSMOS-Web: The emergence of the Hubble Sequence, Huertas-Company et al. 2025, A&A, submitted
- Tracing High-z Galaxies in X-rays with JWST and Chandra, Kaminsky et al. 2025, ApJ, in press
- COSMOS-Web: Stellar mass assembly in relation to dark matter halos across 0.2 < z < 12 of cosmic history, Shuntov et al. 2025, A&A, 695, 20
- Testing for Intrinsic Type Ia Supernova Luminosity Evolution at z > 2 with JWST, Pierel et al. 2025, ApJL, 981, 9
- The COSMOS-Web Lens Survey (COWLS) I: Discovery of >100 high redshift strong lenses in contiguous JWST imaging, Nightingale et al. 2025, MNRAS, submitted
- The COSMOS-Web Lens Survey (COWLS) II: depth, resolution, and NIR coverage from JWST reveal 17 spectacular lenses, Mahler et al. 2025, MNRAS, submitted
- The COSMOS-Web Lens Survey (COWLS) III: forecasts versus data, Hogg et al. 2025, MNRAS, submitted
- COSMOS-Web: A history of galaxy migrations over the stellar mass–star formation rate plane, Arango-Toro et al. 2025, A&A, 696, 159
- The COSMOS-Web ring: Spectroscopic confirmation of the background source at z = 5.1, Shuntov et al. 2025, A&A, 696, 14
- On Soft Clustering For Correlation Estimators: Model Uncertainty, Differentiability, and Surrogates, Berman et al. 2025, OjA, submitted
- COSMOS-Web: Unraveling the Evolution of Galaxy Size and Related Properties at 2<z<10, Yang et al. 2025, ApJ, submitted
- JWST Discovery of a High-Redshift Tidal Disruption Event Candidate in COSMOS-Web, Karmen et al. 2025, ApJ, submitted
- Going deeper into the dark with COSMOS-Web: JWST unveils the total contribution of radio-selected NIR-faint galaxies to the cosmic star formation rate density, Gentile et al. 2025, A&A, 679, 46
- The COSMOS-Web deep galaxy group catalog up to z = 3.7, Toni et al. 2025, A&A, 697, 197
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SCUBADive II: Searching for z>4 Dust-Obscured Galaxies via F150W-Dropouts in COSMOS-Web, Manning et al. 2025, ApJ, submitted
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COSMOS-Web: MIRI Data Reduction and Number Counts at 7.7μm using JWST, Harish et al. 2025, ApJ, submitted
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COSMOS-Web: Comprehensive Data Reduction for Wide-Area JWST NIRCam Imaging, Franco et al. 2025, ApJ, submitted
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COSMOS2025: The COSMOS-Web Galaxy Catalog of Photometry, Morphology, Redshifts, and Physical Parameters from JWST, HST, and Ground-based Imaging, Shuntov et al. 2025, A&A, submitted
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Brightest Group Galaxies IV: Probing Size–mass Relation and Morphological Quenching in COSMOS-Web from z = 3.7, Gozalisal et al. 2025, A&A, submitted
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COSMOS-Web: Estimating Physical Parameters of Galaxies Using Self-Organizing Maps, Abedini et al. 2025, A&A, submitted
Publications from members of the community
- Seeking the growth of the first black hole seeds with JWST, Trinca et al. 2023, MNRAS, 519, 4753
- On the detectability of strong lensing in near-infrared surveys, Holloway et al. 2023, MNRAS, 525, 2341
- JWST Confirms the Nature of CID-42, Li, Zhuang, & Shen 2024, ApJ, 961, 19
- A massive compact quiescent galaxy at z = 2 with a complete Einstein ring in JWST imaging, van Dokkum et al. 2024, NatAs, 8, 119
- Active Galactic Nuclei and Host Galaxies in COSMOS-Web. I. NIRCam Images, Point-spread-function Models and Initial Results on X-Ray-selected Broad-line AGNs at 0.35 ≲ z ≲ 3.5, Zhuang, Li, & Shen 2024, ApJ, 962, 93
- Unveiling Luminous Lyα Emitters at z ≈ 6 through JWST/NIRCam Imaging in the COSMOS Field, Ning et al. 2024, ApJL, 963, 38
- A Radio Galaxy Gravitational Lens in the COSMOS-Web Survey, Moore & Lacy, RNAAS, 8, 62
- Active Galactic Nuclei and Host Galaxies in COSMOS-Web. II. First Look at the Kpc-scale Dual and Offset AGN Population, Li et al. 2024, ApJ, submitted
- JWST's First Glimpse of a z > 2 Forming Cluster Reveals a Top-heavy Stellar Mass Function, Sun et al. 2024, ApJL, 967, 34
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The Size–Mass Relation at Rest-frame 1.5 μm from JWST/NIRCam in the COSMOS-Web and PRIMER-COSMOS Fields, Moartorano et al. 2024, 972, 134
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Sub-Eddington accreting supermassive primordial black holes explain Little Red Dots, Huang et al. 2024, MNRAS, submitted
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Brown dwarf number density in the JWST COSMOS-Web field, Chen et al. 2025, PASA, 42,42
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Evolution of the Sérsic index up to z = 2.5 from JWST and HST, Martorano et al. 2025, A&A, 649, 76
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Bridging Quasars and Little Red Dots: Insights into Broad-Line AGNs at z=5−8 from the First JWST COSMOS-3D Dataset, Lin et al. 2025, ApJ, submitted
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Dual-coding Contrastive Learning Based on the ConvNeXt and ViT Models for Morphological Classification of Galaxies in COSMOS-Web, Zhu et al. 2025, ApJS, 278, 39
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The Cosmic Owl: Twin Active Collisional Ring Galaxies with Starburst Merging Front at z=1.14, Li et al. 2025, ApJ, submitted
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Unveiling a Population of Strong Galaxy-Galaxy Lensed Faint Dusty Star-Forming Galaxies, Yang et al. 2025, ApJL, submitted