Radio-loud high-redshift protogalaxy candidates in Bootes

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 t...

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Bibliographic Details
Published in:arXiv.org 2008-04
Main Authors: Croft, Steve, Wil van Breugel, Brown, Michael J I, de Vries, Wim, Dey, Arjun, Eisenhardt, Peter, Buell Jannuzi, Röttgering, Huub, Stanford, S A, Stern, Daniel, Willner, S P
Format: Article
Language:English
Subjects:
Infrared cameras
Morphology
Photometry
Protogalaxies
Radio galaxies
Red shift
Space telescopes
Spectral energy distribution
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.0803.0325