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COSMOS-Web: Comprehensive Data Reduction for Wide-Area JWST NIRCam Imaging

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arxiv 2506.03256 v1 pith:BMYCESNM submitted 2025-06-03 astro-ph.IM astro-ph.GA

Maximilien Franco , Caitlin M. Casey , Anton M. Koekemoer , Daizhong Liu , Micaela B. Bagley , Henry Joy McCracken , Jeyhan S. Kartaltepe , Hollis B. Akins
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Olivier Ilbert Marko Shuntov Santosh Harish Brant E. Robertson Rafael C. Arango-Toro Andrew J. Battisti Nima Chartab Nicole E. Drakos Andreas L. Faisst Carter Flayhart Ghassem Gozaliasl Michaela Hirschmann Richard Massey Jason Rhodes Zahra Sattari Diana Scognamiglio John R. Weaver Lilan Yang Jorge A. Zavala Edward M. Berman Fabrizio Gentile Steven Gillman Arianna S. Long Georgios Magdis Jacqueline E. McCleary Jed McKinney Bahram Mobasher Louise Paquereau Armin Rest David B. Sanders Sune Toft Si-Yue Yu
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keywords datajwstcosmos-webreductionachievecalibrationjanuarynircam
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We present the data reduction methodology used for the COSMOS-Web survey JWST NIRCam data. Covering 0.54 deg^2 with four broadband filters (F115W, F150W, F277W, F444W) and a total exposure time of approximately 270 hours, COSMOS-Web represents the largest contiguous field surveyed during JWST Cycle 1, posing unique data reduction challenges due to its extensive scale. By combining the official JWST Calibration Pipeline with custom improvements for noise removal, background subtraction, and astrometric alignment, we achieve high fidelity science-ready mosaics. We detail the systematic approach employed in the three stages of the JWST Calibration Pipeline. The data, collected in three epochs from January 2023 to January 2024, encompass 152 visits and have been processed into 20 mosaic tiles to optimize computational efficiency and data processing. The final data products achieve 5 sigma depths of 26.7-28.3 AB mag in 0.15" apertures. The processed and calibrated datasets are made available to the public.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Through Thick and Thin: The Cosmic Evolution of Disk Scale Height

    astro-ph.GA 2026-01 conditional novelty 7.0 of 10

    Disk scale heights at fixed stellar mass rise from 0.56 kpc at z=3.25 to 0.84 kpc at z=1.25, then fall to 0.67 kpc at z=0.25, implying early thick-disk progenitors were dense, hot, intermediate-thickness disks.

  2. JWST+ALMA reveal the ISM kinematics and stellar structure of MAMBO-9, a merging pair of DSFGs in an overdense environment at $z=5.85$

    astro-ph.GA 2025-08 conditional novelty 6.0 of 10

    ALMA and JWST resolve two merging dusty galaxies at z=5.85, measure a 1:5 mass ratio, find star formation hidden in A_V>10 clouds, and infer metal-rich gas inside a possible protocluster.

  3. Physical properties of galaxies and the UV Luminosity Function from $z\sim6$ to $z\sim14$ in COSMOS-Web

    astro-ph.GA 2025-08 unverdicted novelty 5.0 of 10

    A 3,099-galaxy JWST sample at z~6-14 shows a bright-end UV luminosity function excess at z~9-12 relative to evolving Schechter-function predictions, with non-evolving blue UV slopes.

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