CANUCS/Technicolor data release 1: imaging, photometry, slit spectroscopy, and stellar population parameters

Sarrouh, Ghassan T. E. (author), Martis, Nicholas S. (author), Rihtaršič, Gregor (author), Bradač, Maruša (author), Felicioni, Giordano (author), Harshan, Anishya (author), Judež, Jon (author), Markov, Vladan (author), Tripodi, Roberta (author)

We present the first data release of the Canadian NIRISS Unbiased Cluster Survey (CANUCS), a JWST Cycle 1 GTO program targeting five lensing clusters and flanking fields in parallel (A370, MACS0416, MACS0417, MACS1149, and MACS1423; survey area ∼100 arcmin$^2$), with NIRCam imaging, NIRISS slitless spectroscopy, and NIRSpec prism multiobject spectroscopy. Fields centered on cluster cores include imaging in eight bands from 0.9–4.4 μm, alongside continuous NIRISS coverage from 1.15–2 μm, while the NIRCam flanking fields provide five wide-band and nine medium-band filters for exceptional spectral sampling, all to ∼29 mag$_{AB}$. We also present JWST in Technicolor, a Cycle 2 follow-up GO program targeting three CANUCS clusters (A370, MACS0416, and MACS1149). The Technicolor program adds NIRISS slitless spectroscopy in F090W to the cluster fields while adding eight wide-, medium-, and narrowband filters to the flanking fields. This provides NIRCam imaging in all wide- and medium-band filters over ∼30 arcmin$^2$. This paper describes our data reduction and photometry methodology. We release NIRCam, NIRISS, and Hubble Space Telescope imaging, point-spread functions (PSFs), PSF-matched imaging, photometric catalogs, and photometric and spectroscopic redshifts. We provide lens models and stellar population parameters in up to 19 filters for ∼53,000 galaxies in the cluster fields, and ∼44,000 galaxies in up to 29 filters in the flanking fields. We further present 733 NIRSpec spectra and redshift measurements up to z = 10.8. Comparing against our photometric redshifts, we find catastrophic outlier rates of only 4%–7% and scatter of $\sigma_{\mathrm{NMAD}}$ of 0.01–0.03.

• Language: English
• Keywords: galaxy evolution, sky surveys, photometry, spectroscopy, galaxy clusters
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2026
• Number of pages: 45 str.
• Numbering: Vol. 282, no. 1, art. no. 3
• PID: 20.500.12556/RUL-178333
• UDC: 524.8
• ISSN on article: 1538-4365
• DOI: 10.3847/1538-4365/ae1611
• COBISS.SI-ID: 265852419
• Publication date in RUL: 23.01.2026

Record is a part of a journal

• Title: The Astrophysical journal : supplement series
• Shortened title: Astrophys. j., suppl. ser.
• Publisher: University of Chicago Press for the American Astronomical Society
• ISSN: 1538-4365
• COBISS.SI-ID: 515080217

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: razvoj galaksij, pregledi neba, fotometrija, spektroskopija, jate galaksij