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arXiv · 0803.0325

Radio-loud high-redshift protogalaxy candidates in Bootes

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
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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.

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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. 2008-04-14. Radio-loud high-redshift protogalaxy candidates in Bootes. https://doi.org/10.1088/0004-6256%2F135%2F5%2F1793

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