The cluster of galaxies associated with the low-redshift quasar H1821+643

Donald P. Schneider, John N. Bahcall, James E. Gunn, Alan Dressler

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Low resolution spectra have been obtained of eight R ≈ 19 mag galaxies located within 1 arcmin of the low-redshift, high luminosity quasar H1821 + 643. Six of the eight galaxies belong to a cluster that has the same redshift, within the observational errors, as the quasar. Five of the six cluster members have the spectra of early type galaxies; the spectrum of the sixth cluster member contains Hα, O III], and possibly O II emission lines. The other two objects are an emission line foreground galaxy and a background galaxy. The cluster has a Galactocentric redshift of 0.299 ± 0.002 and a radial velocity dispersion of 1050 ± 320 km s-1. The photometric and spectroscopic data suggest that H1821 + 643 is associated with a rich cluster of galaxies.

Original languageEnglish (US)
Pages (from-to)1047-1050
Number of pages4
JournalAstronomical Journal
Issue number4
StatePublished - Apr 1992

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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