The Cluster of Galaxies Associated with the Low-Redshift Quasar H1821+643
Abstract
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 back-ground 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.
- Publication:
-
The Astronomical Journal
- Pub Date:
- April 1992
- DOI:
- 10.1086/116122
- Bibcode:
- 1992AJ....103.1047S
- Keywords:
-
- Galactic Clusters;
- Quasars;
- Red Shift;
- Astronomical Photometry;
- Astronomical Spectroscopy;
- Charge Coupled Devices;
- Luminosity;
- Astrophysics;
- QUASARS: INDIVIDUAL: H1821;
- 643;
- GALAXIES: CLUSTERING