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

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

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1047s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, April 1992, p. 1047-1050.

Other

38

Galactic Clusters, Quasars, Red Shift, Astronomical Photometry, Astronomical Spectroscopy, Charge Coupled Devices, Luminosity

Scientific paper

Low resolution spectra have been obtained of eight R is approximately equal to 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 H-alpha, semiforbidden 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. The photometric and spectroscopic data suggest that H1821 + 643 is associated with a rich cluster of galaxies.

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