COSMOS-Web DR1 MIRI mosaics
COSMOS-Web: MIRI Data Reduction and Number Counts at 7.7μm using JWST
Authors: S. Harish, J. Kartaltepe, D. Liu et al.
The COSMOS-Web DR1 MIRI mosaics can be downloaded using the following links. This page provides a description of the data products; for more details on data reduction methodology, please refer to the MIRI imaging paper: Harish et al. (2025).
Description
This release provides MIRI data products from the full COSMOS-Web program. It includes data in one filter (F770W) from 160 unique visits, acquired across three epochs: January 2023, April 2023, and January 2024.
MIRI data reduction was conducted using version 1.12.5 of the STScI JWST pipeline and Calibration References Data System (CRDS) pmap 1130.
Mosaics are provided as tiles corresponding to the overlapping NIRCam observations (see NIRCam for info on the tile layout/numbering) as well as individual visits. Names of the files are:
mosaic_miri_f770w_COSMOS-Web_{pixel_scale}_{tile}_v1.0_i2d.fitsfor the tile mosaics, and
mosaic_miri_f770w_COSMOS-Web_{pixel_scale}_obs{num}_v1.0_i2d.fitsfor the individual visits, where pixel_scale is either 30mas or 60mas, tile is the name of the NIRCam tile (A1–B10), and num is the visit number.
The full mosaics are provided as *_i2d.fits files, as described in the JWST pipeline documentation. The structure of the *i2d.fits files is as following:
HDU EXTNAME HDU Type DataType Dimensions
0 N/A primary N/A N/A
1 SCI IMAGE float32 ncols x nrows
2 ERR IMAGE float32 ncols x nrows
3 CON IMAGE int32 ncols x nrows x nplanes
4 WHT IMAGE float32 ncols x nrows
5 VAR_POISSON IMAGE float32 ncols x nrows
6 VAR_RNOISE IMAGE float32 ncols x nrows
7 VAR_FLAT IMAGE float32 ncols x nrowsThe sci, err, and wht extensions have been extracted and are provided separately.
The pipeline used for the data reduction integrated codes from Anton M. Koekemoer, Micaela Bagley, and Daizhong Liu. Astrometry is anchored to Gaia-EDR3 and bootstrapped from HST/F814W imaging (Koekemoer et al. 2007) and the COSMOS2020 catalogs (Weaver et al. 2022).
Downloads
Tarballs of all tiles
| Extension | 30mas (CW only) | 60mas (CW only) | 30mas (CW+PRIMER) | 60mas (CW+PRIMER) |
|---|---|---|---|---|
i2d |
F770W (66 Gb) | F770W (18 Gb) | F770W (72 Gb) | F770W (20 Gb) |
sci |
F770W (22 Gb) | F770W (5.5 Gb) | F770W (24 Gb) | F770W (6.0 Gb) |
err |
F770W (8.2 Gb) | F770W (2.3 Gb) | F770W (9.1 Gb) | F770W (2.5 Gb) |
wht |
F770W (8.9 Gb) | F770W (2.5 Gb) | F770W (10 Gb) | F770W (2.7 Gb) |
Individual tiles
| Tile | 30mas (CW only) | 60mas (CW only) | 30mas (CW+PRIMER) | 60mas (CW+PRIMER) |
|---|---|---|---|---|
| A1 | i2d sci err wht | i2d sci err wht | ||
| A2 | i2d sci err wht | i2d sci err wht | i2d sci err wht | i2d sci err wht |
| A3 | i2d sci err wht | i2d sci err wht | i2d sci err wht | i2d sci err wht |
| A4 | i2d sci err wht | i2d sci err wht | ||
| A5 | i2d sci err wht | i2d sci err wht | ||
| A6 | i2d sci err wht | i2d sci err wht | ||
| A7 | i2d sci err wht | i2d sci err wht | ||
| A8 | i2d sci err wht | i2d sci err wht | ||
| A9 | i2d sci err wht | i2d sci err wht | ||
| A10 | i2d sci err wht | i2d sci err wht | ||
| B1 | i2d sci err wht | i2d sci err wht | ||
| B2 | i2d sci err wht | i2d sci err wht | i2d sci err wht | i2d sci err wht |
| B3 | i2d sci err wht | i2d sci err wht | i2d sci err wht | i2d sci err wht |
| B4 | i2d sci err wht | i2d sci err wht | ||
| B5 | i2d sci err wht | i2d sci err wht | ||
| B6 | i2d sci err wht | i2d sci err wht | ||
| B7 | i2d sci err wht | i2d sci err wht | i2d sci err wht | i2d sci err wht |
| B8 | i2d sci err wht | i2d sci err wht | i2d sci err wht | i2d sci err wht |
| B9 | i2d sci err wht | i2d sci err wht | ||
| B10 | i2d sci err wht | i2d sci err wht |
Individual visits
Mosaics of each COSMOS-Web visit are provided below, at 60mas pixel scale.