The fraction of clumpy star-forming galaxies in nearby galaxies from CLAUDS and HSC-SSP

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ID: 326966
2026
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Abstract
Abstract Massive, star-forming clumps are regions of intensive star-formation that are commonly observed in high-redshift (z > 1) galaxies. Observations of low-redshift clumpy galaxy analogues are rare but the availability of wide-field galaxy survey data makes the detection of large clumpy galaxy samples much more feasible. We present a population of 12,790 star-forming clumps detected in a mass-complete sample of 5,395 star-forming galaxies (SFGs) at redshifts z ≤ 0.32, located in the XMM-LSS, E-COSMOS and DEEP2-3 fields observed by the Hyper Suprime-Cam Subaru Strategic Survey (HSC-SSP) and CFHT Large Area U-band Deep Survey (CLAUDS). The clumps were detected using an improved version of our Deep Learning (DL)-based object detection framework which uses the Zoobot foundation DL-model as a ‘backbone’ feature extractor. We determined the fraction of star-forming galaxies hosting at least one off-centre clump (fclumpy) based on a clump definition that requires a clump-galaxy flux ratio in the CLAUDS u-band of ≥8%. We estimate fclumpy to decrease from ~31% at z ~ 0.3 to ~23% at z ~ 0.1, which aligns well with a low-redshift extrapolation of the clumpy fraction that is measured using high-redshift observations. At fixed redshift, fclumpy is negatively correlated with the stellar mass and positively correlated with the specific star-formation rate (sSFR) of the host galaxies. When the clump definition is changed to include only clumps with a stellar mass of Mcl ≥ 107M⊙, we observe a highly increased clumpy fraction of ~60% that tends to increase with the stellar mass of the host galaxies but does not show a dependence on the sSFR of the host galaxies.
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openalex_W7206188719 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Jürgen Popp, Hugh Dickinson, S. Serjeant, L. Fortson, Tobias Géron, Vihang Mehta
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1653
URL
https://doi.org/10.1093/mnras/stag1653
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