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RADIO-LOUD HIGH-REDSHIFT PROTOGALAXY CANDIDATES IN BOÖTES

Steve Croft et al 2008 The Astronomical Journal 135 1793-1802   doi: 10.1088/0004-6256/135/5/1793  Help

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Steve Croft1,2,3,4, Wil van Breugel1,2, Michael J. I. Brown5, Wim de Vries1,3, Arjun Dey6, Peter Eisenhardt7, Buell Jannuzi6, Huub Röttgering8, S. A. Stanford1,3, Daniel Stern7 and S. P. Willner9
1 Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory L-413, 7000 East Avenue, Livermore, CA 94550, USA
2 University of California, Merced, P.O. Box 2039, Merced, CA 95344, USA
3 Department of Physics, University of California at Davis, 1 Shields Avenue, Davis, CA 95616, USA
4 University of California, Berkeley, 601 Campbell Hall #3411, Berkeley, CA 94720, USA
5 School of Physics, Monash University, Clayton, Victoria, Australia
6 National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA
7 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
8 Leiden Observatory, Niels Bohrweg 2, NL-2333 CA Leiden, The Netherlands
9 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA

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 Boötes. Our targets have 1.4 GHz radio flux densities greater than 1 mJy, but are undetected in the optical to gsim24 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.

Key words: galaxies: active; galaxies: high-redshift; galaxies: starburst; infrared: galaxies

Print publication: Issue 5 (2008 May)
Received 2007 July 3, accepted for publication 2008 February 29
Published 2008 April 7

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