The radio properties and environment of the remarkable radio-quiet quasar E1821 + 643

Details The radio properties and environment of the remarkable radio-quiet quasar E1821 + 643 The radio properties and environment of the remarkable radio-quiet quasar E1821 + 643

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..828l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 4, p. 828-832.

Astronomy and Astrophysics

Astronomy

30

Active Galactic Nuclei, Elliptical Galaxies, Galactic Clusters, Quasars, Radio Galaxies, Charge Coupled Devices, Radio Sources (Astronomy), Red Shift

Scientific paper

E1821 + 643 is remarkable in two respects: it is an intrinsically highly luminous (MB is about -27) quasar at relatively low redshift (z = 0.297), and it is known to lie in a rich cluster of galaxies but, unlike most other AGN in clusters, has no reported radio emission. We show that, although E1821 + 643 does indeed belong to the well-defined class of 'radio-quiet' quasars (RQQs), its extreme optical brightness does make it reasonably bright at radio wavelengths: radio maps of the quasar and a nearby cluster member, which together constitute a single 3.4-Jy 8C (38 MHz) source, show that the former has a compact core and a possible one-sided jet, while the latter is a normal cluster Fanaroff-Riley class I source. We use new CCD imaging to quantify the richness of the cluster of galaxies around the quasar, finding that with an Abell richness class greater than 2 it is among the richest clusters known. Our conclusion is that E1821 + 643 is the clearest example to date of an RQQ whose environment is of the type normally thought to be associated exclusively with radio-loud AGN, namely a giant elliptical galaxy at the center of a rich cluster.

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