Distant radio galaxies in the near-IR

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astrometry, Near Infrared Radiation, Radio Galaxies, Radio Sources (Astronomy), Sky Surveys (Astronomy), Star Formation, Astronomical Photometry, Cosmology, Red Shift, Southern Hemisphere

Scientific paper

We report the results of a survey of 1 Jy class radio sources in the Southern Hemisphere. We have identified 20 galaxies with z greater than 2 and an additional approximately 16 with z between 1 and 2. Multicolor, g, r, i, J, H, and K photometry is used with spectral-evolution models to constrain the star-formation histories and formation redshifts. The reddest galaxies at z greater than 2 appear to be more than 2 Gyr old, implying large formation redshifts.

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