Radio-loud high-redshift protogalaxy candidates in botes

Steve Croft, Wil Van Breugel, Michael J.I. Brown, Wim De Vries, Arjun Dey, Peter Eisenhardt, Buell Jannuzi, Huub Röttgering, S. A. Stanford, Daniel Stern, S. P. Willner

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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 Boötes. Our targets have 1.4 GHz radio flux densities greater than 1 mJy, but are undetected in the optical to ≳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 z phot = 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.

Original languageEnglish (US)
Pages (from-to)1793-1802
Number of pages10
JournalAstronomical Journal
Issue number5
StatePublished - May 1 2008


  • Galaxies: active
  • Galaxies: high-redshift
  • Galaxies: starburst
  • Infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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