JWST Reveals a Galaxy-Wide Association of Red Supergiants with OB Stars in NGC 5584

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ID: 324943
2026
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Abstract
Abstract The spatial relationship between young and evolved massive-star tracers offers a means of probing recent star formation across galactic disks. We combine JWST/NIRCam, Swift/UVOT UVW2, and GALEX FUV/NUV images to investigate the spatial association between red-supergiant (RSG) candidates and UV-selected star-forming complexes (SFCs) in the spiral galaxy NGC 5584. We identify 5,310 RSG candidates using colour–magnitude criteria and define 106 UV-selected SFCs from the UVOT/UVW2 morphology, with their FUV and NUV luminosities measured independently using the GALEX images. We find that 82 % of the UV-selected SFCs overlap significant RSG overdensities, indicating a galaxy-wide statistical association between UV-bright SFCs and the evolved massive-star population. Among the 93 SFCs with reliable JWST coverage, the UV-β-corrected FUV and NUV luminosities correlate tightly with the JWST/NIRCam luminosities, with Pearson correlation coefficients of r = 0.962–0.971. MIST isochrone comparisons for 43 RSG-rich SFCs indicate a characteristic age of log (age/yr) ≃ 7.16. These results show that RSG overdensities and UV-selected SFCs trace related but distinct phases of recent massive-star formation. Their spatial correspondence is statistical rather than one-to-one and likely reflects differences in stellar age, dust extinction, spatial resolution, aperture coverage, and local star-formation history.
Reference Key
openalex_W7202196299 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Min Dai, Shu Wang, Biwei Jiang
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1519
URL
https://doi.org/10.1093/mnras/stag1519
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