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MIGHTEE: The Continuum Survey Data Release 1

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arxiv 2411.04958 v1 pith:SLDJ3R6F submitted 2024-11-07 astro-ph.GA

C. L. Hale , I. Heywood , M. J. Jarvis , I. H. Whittam , P. N. Best , Fangxia An , R. A. A. Bowler , I. Harrison
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A. Matthews D. J. B. Smith A. R. Taylor M. Vaccari
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classification astro-ph.GA
keywords imagessurveydatafieldhigherlowermighteerelease
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abstract

The MeerKAT International GHz Tiered Extragalactic Exploration Survey (MIGHTEE) is one of the large survey projects using the MeerKAT telescope, covering four fields that have a wealth of ancillary data available. We present Data Release 1 of the MIGHTEE continuum survey, releasing total intensity images and catalogues over $\sim$20 deg$^2$, across three fields at $\sim$1.2-1.3 GHz. This includes 4.2 deg$^2$ over the Cosmic Evolution Survey (COSMOS) field, 14.4 deg$^2$ over the XMM Large-Scale Structure (XMM-LSS) field and deeper imaging over 1.5 deg$^2$ of the Extended Chandra Deep Field South (CDFS). We release images at both a lower resolution (7-9 arcsec) and higher resolution ($\sim 5$ arcsec). These images have central rms sensitivities of $\sim$1.3$-$2.7 $\mu $Jy beam$^{-1}$ ($\sim$1.2$-$3.6 $\mu $Jy beam$^{-1}$) in the lower (higher) resolution images respectively. We also release catalogues comprised of $\sim$144~000 ($\sim$114 000) sources using the lower (higher) resolution images. We compare the astrometry and flux-density calibration with the Early Science data in the COSMOS and XMM-LSS fields and previous radio observations in the CDFS field, finding broad agreement. Furthermore, we extend the source counts at the $\sim$10 $\mu$Jy level to these larger areas ($\sim 20$ deg$^2$) and, using the areal coverage of MIGHTEE we measure the sample variance for differing areas of sky. We find a typical sample variance of 10-20 per cent for 0.3 and 0.5 sq. deg. sub-regions at $S_{1.4} \leq 200$ $\mu $Jy, which increases at brighter flux densities, given the lower source density and expected higher galaxy bias for these sources.

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Forward citations

Cited by 10 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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    Correlating Wigner functions of the received fields yields a coherence pattern with roughly twice the spatial frequency content of the standard visibility, pointing to a possible two-fold angular resolution gain.

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    The SFR–1.4 GHz radio correlation is log10(SFR) = 0.790(L′)+1.244(1+z)^0.122−0.033M′ with 0.178 dex scatter, showing significant redshift but weak mass dependence when AGN are treated probabilistically.

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  4. Another piece to the puzzle: radio detection of a JWST detected AGN candidate

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    A multi-field radio search of JWST AGN candidates yields one radio detection and stacking limits that are not yet deep enough to confirm or rule out radio-weakness.

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