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HST WFC3/Grism observations of the candidate ultra-high-redshift radio galaxy GLEAM J0917-0012

Seymour, N.; Drouart, G.; Vernet, J. D. R. +11 more

We present Hubble Space Telescope Wide Field Camera 3 photometric and grism observations of the candidate ultra-high-redshift ( $z>7$ ) radio galaxy, GLEAM J0917-0012. This radio source was selected due to the curvature in its 70-230 MHz, low-frequency Murchison Widefield Array radio spectrum and its faintness in K-band. Follow-up spectroscopic…