sagui : SED-based segmentation of multiband Galaxy images – application to JADES in GOODS-South
Year: 2026
Type: article
Abstract: ABSTRACT We present sagui, a modular framework for the analysis of multiband 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 data sets, 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 11 morphologically diverse galaxies from the James Webb Space Telescope Advanced Deep Extragalactic Survey in the Great Observatories Origins Deep Survey South (GOODS-South) field. sagui is released under an MIT license and is available at GitHub.
Institutions: University of North Carolina at Chapel Hill, Universidade Federal do Rio Grande do Sul, University of Hertfordshire, Max Planck Institute for Astronomy, University of California, Irvine, The University of Sydney, ARC Centre of Excellence for Dark Matter Particle Physics, Instituto Nacional de Pesquisas Espaciais, European Southern Observatory, European Southern Observatory, Centre National de la Recherche Scientifique, Université Clermont Auvergne, Institut National de Physique Nucléaire et de Physique des Particules, Curtin University, International Centre for Radio Astronomy Research, National Observatory, Centro Brasileiro de Pesquisas Físicas
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,046
Funders: National Aeronautics and Space Administration, Entomological Society of America, Communal Studies Association, Space Telescope Science Institute, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul, Science and Technology Facilities Council
OpenAlex ID: W7163643977