Multicolor detection of high-redshift quasars. II. Five objects with z 4
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We report the results of a multicolor wide-field CCD survey designed to rediscover several BRI quasars previously found in a photographic survey by Irwin et al. [ASPCS, 21, 117 (1991)], but not fully documented in the literature. Here we provide spectra, redshifts, finding charts, magnitudes, and coordinates for four such BRI quasars. Follow-up observations were obtained for BRI 2235-03, a borderline BAL object. A moderate resolution absorption line spectrum for the object shows a very dense Ly forest and two C IV doublets at z>3. Its visible spectrum is redder than those of the other quasars presented, although it is similar in the infrared. J, H, and K magnitudes are presented for this quasar, showing it to be one of the most luminous objects known. New J, H, and K photometry is presented for PC 1247+3406, the most distant quasar known. In the course of the survey we also discovered a new quasar with z=4.042. Its spectrum, coordinates, magnitudes, and finding chart are presented here as well.
author list (cited authors)
Smith, J. D., Djorgovski, S., Thompson, D., Brisken, W. F., Neugebauer, G., Matthews, K., ... Suntzeff, N. B.