Radio-loud high-redshift protogalaxy candidates in Bootes

Abstract

We used the Near Infrared Camera on Keck I to obtain Ks-band images of four candidate high-redshift radio galaxies selected using optical and radio data in the NOAO Deep Wide-Field Survey in Bootes. Our targets have 1.4 GHz radio flux densities greater than 1 mJy, but are undetected in the optical to fainter than 24 Vega mag. Spectral energy distribution fitting suggests that three of these objects are at z > 3, with radio luminosities near the FR-I / FR-II break. The other has photometric redshift 1.2, but may in fact be at higher redshift. Two of the four objects exhibit diffuse morphologies in Ks -band, suggesting that they are still in the process of forming.

25 pages, 8 figures, accepted for publication in AJ; minor changes to match published version

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• The LOFAR Two Meter Sky Survey: Deep Fields, I -- Direction-dependent calibration and imaging
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• The LOFAR LBA Sky Survey: Deep Fields I. The Boötes Field