The LOFAR LBA Sky Survey: Deep Fields I. The Bo\"otes Field
W.L. Williams, F. de Gasperin, M.J.H. Hardcastle, R. van Weeren, C., Tasse, T.W. Shimwell, P.N. Best, M. Bonato, M. Bondi, M. Br\"uggen, H.J.A., R\"ottgering, D.J.B. Smith

TL;DR
This paper presents the deepest low-frequency radio survey of the Bo"otes field below 100 MHz, achieving high resolution and sensitivity, and provides a detailed source catalogue and spectral analysis revealing population characteristics.
Contribution
It introduces the first sub-mJy, widefield low-frequency survey below 100 MHz with high resolution, detailed calibration, and comprehensive source cataloging and spectral analysis.
Findings
Detected 1,948 sources over 23.6 deg$^2$ at 34-75 MHz.
Found spectral flattening for lower flux density sources.
Identified a growing population of star-forming galaxies and compact AGN.
Abstract
We present the first sub-mJy ( mJy beam) survey to be completed below 100 MHz, which is over an order of magnitude deeper than previously achieved for widefield imaging of any field at these low frequencies. The high resolution ( arcsec) image of the Bo\"otes field at 34-75 MHz is made from 56 hours of observation with the LOw Frequency ARray (LOFAR) Low Band Antenna (LBA) system. The observations and data reduction, including direction-dependent calibration, are described here. We present a radio source catalogue containing 1,948 sources detected over an area of deg, with a peak flux density threshold of . Using existing datasets, we characterise the astrometric and flux density uncertainties, finding a positional uncertainty of arcsec and a flux density scale uncertainty of about 5 per cent. Using the available deep…
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Taxonomy
TopicsRadio Astronomy Observations and Technology · Galaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research
