Radio-loud high-redshift protogalaxy candidates in Bootes - INSPIRE

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Radio-loud high-redshift protogalaxy candidates in Bootes

Mar, 2008

25 pages

Published in:

Astron.J. 135 (2008) 1793

e-Print:

0803.0325 [astro-ph]

DOI:

10.1088/0004-6256/135/5/1793

View in:

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Abstract: (arXiv)

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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