This page presents preliminary internal access to the full LOFAR international baseline wide field images and catalogues of the Lockman Hole field. These 120-168MHz data products are presently unique: they highlight the full capabilities of LOFAR and are the collaboration's first wide-field ~0.3” resolution science quality products. The images reach an excellent sensitivity of 0.03mJy/beam in just 8hrs thanks to the large collecting area of the international stations. In total 2483 sources are detected above 5 sigma within a 6.6 square degree region and given the excellent resolution these can be characterised more precisely than was previously possible. The catalogue is also cross matched with the LoTSS-deep catalogue allowing for quickly finding the optical counterparts and their properties for many of the detected sources.
The image was produced following the procedure described in Sweijen et al., 2022 but in summary the image was produced by self calibrating the data in 44 separate directions. Imaging is done in 25 facets, and from these are produced catalogues that are joined to make a single non-redundant catalogue. We also supply a mosaic image where the 25 facets have been convolved to a common resolution of 0.45 x 0.40 arcsecs before mosaicing. This mosaic is provided for convenience of browsing only and we recommend users to extract sub-images from the individual facets if possible.
Below we provide:
Wide field products:
- Mosaic image with matched resolution.
- HIPS image
- Catalogue (note that the Source_Name_LOTSS column links sources to the LoTSS-Deep DR1 catalogue entries that are available here; several HD catalogue entries may match a single DR1 source)
- Catalogue description
Individual facet products:
If you make any scientific use of these data, we kindly request that you include the following acknowledgment:
LOFAR data products were provided by the LOFAR Surveys Key Science project (LSKSP; https://lofar-surveys.org/) and were derived from observations with the International LOFAR Telescope (ILT). LOFAR (van Haarlem et al. 2013) is the Low Frequency Array designed and constructed by ASTRON. It has observing, data processing, and data storage facilities in several countries, which are owned by various parties (each with their own funding sources), and which are collectively operated by the ILT foundation under a joint scientific policy. The efforts of the LSKSP have benefited from funding from the European Research Council, NOVA, NWO, CNRS-INSU, the SURF Co-operative, the UK Science and Technology Funding Council and the Jülich Supercomputing Centre.and please in addition cite Sweijen et al., which describes the images.