The nature and likely redshift of GLEAM J0917–0012

Abstract We previously reported a putative detection of radio galaxy at $z=10.15$ , selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The redshift this source, GLEAM J0917–0012, was based on three weakly detected molecular emission lines observed with Atacama Large Millimetre (ALMA). In order to confirm result, we conducted deep spectroscopic follow-up observations ALMA Karl Jansky Very (VLA). targeted same CO in Band 3 (84–115 GHz) VLA CO(4-3) [CI(1-0)] for an independent confirmation Q -band (41 44 GHz). Neither observation any lines, removing support our original interpretation. Adding publicly available optical data Hyper Suprime-Cam survey, Infrared Survey Explorer ( WISE ), Herschel Space Observatory infrared, as well $<$ 10 GHz polarisation 162 MHz inter-planetary scintillation observations, model physical observational characteristics J0917–0012 function redshift. Comparing these predictions relations data, are able constrain its nature distance. argue that if is $z<3,$ then it has extremely unusual nature, more likely solution source lies above $z=7$ .