Discovery Of A Radio-selected Z 6 Quasar

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

High redshift (z>5.7) represent some of the earliest and brightest objects in the Universe. These distant super-massive black holes are important in the study of galaxy evolution and the re-ionization epoch. Much of the 60 known z>5.7 quasars are optically-selected with red i'-z' colors and blue z'-J colors. Optical-selection may miss a substantial population of reddened quasars (red z'-J colors) that can be found through radio-selection. McGreer et al. (2006) discovered a z=6.21 radio-selected quasar with colors that placed it outside of the usual optical-selection. We present the discovery of only the second radio-selected z>5.7 quasar known (z=5.92). We also discuss the implications of the discovery and future efforts.

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