MIGHTEE: Are giant radio galaxies more common than we thought?

J. Delhaize, I. Heywood, M. Prescott, M. J. Jarvis, I. Delvecchio, I. H. Whittam, S. V. White, M. J. Hardcastle, C. L. Hale, J. Afonso, Y. Ao, M. Brienza, M. Brueggen, J. D. Collier, E. Daddi, M. Glowacki, N. Maddox, L. K. Morabito, I. Prandoni, Z. RandriamanakotoS. Sekhar, Fangxia An, N. J. Adams, S. Blyth, R. A. A. Bowler, L. Leeuw, L. Marchetti, S. M. Randriamampandry, K. Thorat, N. Seymour, O. Smirnov, A. R. Taylor, C. Tasse, M. Vaccari

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We report the discovery of two new giant radio galaxies (GRGs) using the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey. Both GRGs were found within a 1 deg^2 region inside the COSMOS field. They have redshifts of z=0.1656 and z=0.3363 and physical sizes of 2.4Mpc and 2.0Mpc, respectively. Only the cores of these GRGs were clearly visible in previous high resolution VLA observations, since the diffuse emission of the lobes was resolved out. However, the excellent sensitivity and uv coverage of the new MeerKAT telescope allowed this diffuse emission to be detected. The GRGs occupy a unpopulated region of radio power - size parameter space. Based on a recent estimate of the GRG number density, the probability of finding two or more GRGs with such large sizes at z
Original languageEnglish
Article numberstaa3837
JournalMonthly Notices of the Royal Astronomical Society
Early online date14 Dec 2020
Publication statusE-pub ahead of print - 14 Dec 2020


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