Mightee: Multi-wavelength counterparts in the Comos field
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Date
2024
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
In this paper, we combine the early science radio continuum data from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Survey, with optical and near-infrared data and release the cross-matched catalogues. The radio data used in this work covers 0.86 deg2 of the COSMOS field, reaches a thermal noise of 1.7 μJy beam-1 and contains 6102 radio components. We visually inspect and cross-match the radio sample with optical and near-infrared data from the hyper suprime-cam (HSC) and UltraVISTA surveys. This allows the properties of active galactic nuclei and star-forming populations of galaxies to be probed out to z ≈ 5. Additionally, we use the likelihood ratio method to automatically cross-match the radio and optical catalogues and compare this to the visually cross-matched catalogue. We find that 94 per cent of our radio source catalogue can be matched with this method, with a reliability of 95 per cent. We proceed to show that visual classification will still remain an essential process for the cross-matching of complex and extended radio sources. In the near future, the MIGHTEE survey will be expanded in area to cover a total of ∼20 deg2; thus the combination of automated and visual identification will be critical. We compare the redshift distribution of SFG and AGN to the SKADS and T-RECS simulations and find more AGN than predicted at z ∼1.
Description
Keywords
Galaxies, Galaxies: evolution, Radio continuum, surveys, Galaxies: Active
Citation
Whittam, I.H., Prescott, M., Hale, C.L., Jarvis, M.J., Heywood, I., An, F., Glowacki, M., Maddox, N., Marchetti, L., Morabito, L.K. and Adams, N.J., 2024. MIGHTEE: Multi-wavelength counterparts in the COSMOS field. Monthly Notices of the Royal Astronomical Society, 527(2), pp.3231-3245.