2008/03/31 by Steve Croft, S. Croft, Wil van Breugel +13
Physics and Astronomy · #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae #Radio Astronomy Observations and Technology #astro-ph
paper · pdf · doi:10.1088/0004-6256/135/5/1793
25 pages, 8 figures, accepted for publication in AJ; minor changes to match published version
openalex publication_date 2008/04/07 · arxiv created 2008/04/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 1.4GHz radio flux densities greater than 1mJy, 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 zphot = 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.