Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..480m&link_type=abstract
Nature, vol. 290, Apr. 9, 1981, p. 480, 481. NSF-NASA-supported research.
Astronomy and Astrophysics
Astronomy
20
Galactic Clusters, Heao 2, Quasars, X Ray Sources, X Ray Telescopes, Cosmology, Doppler Effect, Galactic Radiation, Signal To Noise Ratios, X Ray Astronomy, X Ray Spectra
Scientific paper
The discovery of a new quasistellar object (QSO) which presents the strongest evidence to date for the membership of quasars in rich clusters is reported. During X-ray observations of quasar 3C345, a serendipitous X-ray source located 8 arcmin northeast of the quasar was discovered. The observed flux of the new source is 3.2 x 10 to the -13th erg/sq cm/sec in the 0.5-4.5 keV band. Three separate observations over a six-month period failed to show intensity variability in excess of the statistical uncertainty in the count rate. The spectrum shows a modest signal-to-noise ratio but four strong emission lines. It is suggested that the redshift agreement between the two QSOs indicates a common membership in a cluster of galaxies which may well be a rich cluster.
Chanan Gary A.
Downes Ronald A.
Margon Bruce
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