English

Discovery of a Radio-Selected z ~ 6 Quasar

Cosmology and Nongalactic Astrophysics 2015-05-28 v1

Abstract

We present the discovery of only the second radio-selected, z ~ 6 quasar. We identified SDSS J222843.54+011032.2 (z=5.95) by matching the optical detections of the deep Sloan Digital Sky Survey (SDSS) Stripe 82 with their radio counterparts in the Stripe82 VLA Survey. We also matched the Canadian-France-Hawaiian Telescope Legacy Survey Wide (CFHTLS Wide) with the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey but have yet to find any z ~ 6 quasars in this survey area. The discovered quasar is optically-faint, z = 22.3 and M_{1450} ~ -24.5, but radio-bright, with a flux density of f1.4GHz,peak_{1.4GHz, peak} = 0.31mJy and a radio-loudness of R ~ 1100 (where R = f_{5GHz}/f_{2500}). The i-z color of the discovered quasar places it outside the color selection criteria for existing optical surveys. We conclude by discussing the need for deeper wide-area radio surveys in the context of high-redshift quasars.

Keywords

Cite

@article{arxiv.1105.2047,
  title  = {Discovery of a Radio-Selected z ~ 6 Quasar},
  author = {Gregory R. Zeimann and Richard L. White and Robert H. Becker and Jacqueline A. Hodge and Spencer A. Stanford and Gordon T. Richards},
  journal= {arXiv preprint arXiv:1105.2047},
  year   = {2015}
}

Comments

20 pages, 6 figures, and ApJ accepted