Deep far-UV observations of the ELAIS N1 field using AstroSat: Source catalogue, spectral energy distribution modelling and star formation

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ID: 320321
2026
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Abstract
Abstract We present a far-ultraviolet (FUV) photometric study of the ELAIS N1 deep field using the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat, observed in the F154W filter (λeff = 1541 Å) with a total on-source exposure time of 30 ksec. Level 1 data were reduced using CCDLAB v3.0, yielding source catalogues of 1637 objects at 3σ and 458 objects at 5σ, with limiting magnitudes of 25.69 mAB and 25.13 mAB respectively. FUV positions are cross-matched against multiwavelength catalogues spanning optical and infrared wavelengths, with redshifts drawn from spectroscopic and photometric sources. Active galactic nuclei (AGN) are identified and excluded via established multiwavelength criteria, leaving a clean sample of star-forming galaxies (SFGs). Spectral energy distribution (SED) modelling is performed using CIGALE, employing a delayed star formation history with an optional late burst, Bruzual & Charlot stellar population synthesis, Calzetti dust attenuation, and the SKIRTOR AGN module. From the best-fit models, we derive star formation rates (SFRs), total stellar masses, and young stellar masses as a function of redshift. The SFR increases monotonically with redshift, consistent with the evolution of the Star Formation Main Sequence (SFMS). The ratio of young-to-total stellar mass remains approximately constant across 0 < z ≲ 0.76, confirming that the sample consists predominantly of secularly evolving systems undergoing steady, self-regulated star formation rather than starburst-driven episodes.
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Authors Pranjal Chaturvedi, Akriti Sinha, Abhirup Datta, K Saha
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Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1291
URL
https://doi.org/10.1093/mnras/stag1291
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