SAGUI: SED-based Segmentation of Multi-band Galaxy Images — Application to JADES in GOODS-South

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ID: 316019
2026
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Abstract
Abstract We present sagui, a modular framework for the analysis of multi-band imaging data in spatially resolved galaxies, with synergies to integral-field spectroscopy (IFS). Building on the spectro-spatial paradigm introduced by capivara for IFS data, sagui extends this approach to imaging datasets, enabling a coherent, pixel-level treatment of spatial and spectral information across multiple bands. The method follows a two-stage strategy: a starlet-based decomposition is first used to identify and mask spatial structures across multiple scales while suppressing noise, and a spectral-similarity analysis then partitions the image into coherent pixel groups that preserve spectral consistency. In addition to compact and high-contrast structures, the framework incorporates a dedicated statistical treatment, based on a copula transform, to identify and recover faint, diffuse low-surface-brightness components. We demonstrate the method across a diverse range of galaxy morphologies, highlighting its ability to characterize complex spatial structures, including clumps, bars, interacting systems, and low-surface-brightness features. As a case study, we apply it to eleven morphologically diverse galaxies from the James Webb Space Telescope Advanced Deep Extragalactic Survey (JADES) in the GOODS–South field. sagui is released under an MIT license and is available at GitHub.
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Authors R K Souza, Andressa Wille, Shravya Shenoy, Aarya A Patil, Alberto Krone-Martins, Ana L. Chies-Santos, Celine Boehm, Reinaldo R. Rosa, Thallis Pessi, Emille E O Ishida, Kristen C. Dage, Lilianne Nakazono, P. Darc, Rupesh Durgesh
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1062
URL
https://doi.org/10.1093/mnras/stag1062
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