Discovery of a radio galaxy at z = 5.72

  title={Discovery of a radio galaxy at z = 5.72},
  author={A. Saxena and Murilo Marinello and Roderik Overzier and Philip N. Best and Huub J. A. R{\"o}ttgering and Kenneth J Duncan and Isabella Prandoni and Laura Pentericci and M Magliocchetti and Diego Paris and Felice Cusano and Fabrizio De Marchi and Huib T. Intema and G. K. Miley},
  journal={Monthly Notices of the Royal Astronomical Society},
We report the discovery of the most distant radio galaxy to date, TGSS1530 at a redshift of $z=5.72$ close to the presumed end of the Epoch of Reionisation. The radio galaxy was selected from the TGSS ADR1 survey at 150 MHz for having to an ultra-steep spectral index, $\alpha^{\textrm{150 MHz}}_{\textrm{1.4 GHz}} = -1.4$ and a compact morphology obtained using VLA imaging at 1.4 GHz. No optical or infrared counterparts for it were found in publicly available sky surveys. Follow-up optical… 

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