LOFAR ELAIS-N1 field at 144MHz catalog

It was made from an 8-hour International LOFAR Telescope (ILT) observation of the ELAIS-N1 field at frequencies ranging from 120 to 168MHz with the most up-to-date ILT imaging methods. This intermediate resolution falls between the highest possible resolution (0.3arcsec) achievable by using all International LOFAR Telescope (ILT) baselines and the standard 6-arcsecond resolution in the LoTSS (LOFAR Two-meter Sky Survey) image products utilizing the LOFAR Dutch baselines only.

This is the first demonstration of the feasibility of imaging using the ILT at a resolution of around 1 arcsec, which provides unique information on source morphology at scales that fall below the surface brightness limits at higher resolutions. The total calibration and imaging computational time is approximately 52000 core hours, nearly 5 times more than required to produce a 6 arcsec resolution image. We also present a radio source catalogue containing 2263 sources detected over the 2.5x2.5deg^2^ image of the ELAIS-N1 field, with a peak intensity threshold of 5.5 sigma.