PC 1247+3406: An optically selected quasar with a redshift of 4.897

Donald P. Schneider, Maarten Schmidt, James E. Gunn

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This paper describes observations of PC 1247 + 3406, a quasar with a redshift of 4.897 ± 0.011. The redshift is based on three strong emission lines and the presence of substantial absorption, presumably due to "Lyman α clouds," on the blue side of the Lyman α emission line. The quasar is about the same brightness as PC 1158 + 4635, the 20th magnitude z = 4.733 quasar found in 1989. PC 1247 + 3406 was discovered in a four-filter CCD survey designed to detect quasars with redshifts between 4.0 and 5.5. The properties of PC 1247 + 3406 seem quite similar to other z> 3 quasars, although the absorption due to intervening neutral hydrogen is ≈20% less than expected. The flux in the spectrum abruptly drops at a wavelength of ≈910 Å in the rest frame of the quasar. This quick encounter with a Lyman-limit system is frequently seen in other z>4.3 quasars.

Original languageEnglish (US)
Pages (from-to)837-840
Number of pages4
JournalAstronomical Journal
Issue number3
StatePublished - Sep 1991

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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