MIGHTEE-HI: Hi catalogue of 293 sources for the COSMOS field and comparative study of 3-dimensional source finding methods

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ID: 317145
2026
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Abstract
Abstract We present a catalogue of Hi sources extracted from the MIGHTEE survey data cubes covering the COSMOS field. The catalogue contains 293 sources in the redshift range of 0.004 < z < 0.093. In addition to Hi masses and velocity widths, the catalogue includes optical through near-infrared photometry and inferred stellar masses and star-formation rates. The quantity of sources in the Hi catalogue acquired through untargeted source finding is greatly influenced by the source finding methods used. This study therefore also provides a well-characterised expected completeness of the detected sample of galaxies based on their properties, informing of any detection biases, inferred through a comparative study of different source finding algorithms. We have tested the performance of widely-used source finders: PyBDSF, ProFound and SoFiA, along with new source finder LESHI, focusing exclusively on Hi source detection rather than source characterisation in the first instance. The source finders were tested by injecting a sample of simulated galaxies divided into narrow bins of mass, inclination and distance into a MeerKAT data cube. The results inform the source finding strategies for the MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) survey, as well as upcoming SKAO surveys.
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Authors Michalina Maksymowicz-Maciata, Natasha Maddox, Catherine Hale, B. J. Maughan, M. J. Jarvis, Anastasia A Ponomareva, I Heywood, Hengxing Pan, Sushma Kurapati, Tom G. Hardy, Marcin Glowacki, T. Westmeier, M. Baes, S Lyla Jung, Andreea Vărăşteanu
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1091
URL
https://doi.org/10.1093/mnras/stag1091
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