Radio sources in Zwicky clusters of galaxies. I. Pencil beam and preliminary interferometer observations

Journal Article · Sun Oct 01 04:00:00 EDT 1978 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/112303· OSTI ID:6715689

Burns, J O

Observations of a sample of 4C sources which lie in the directions of Zwicky clusters of galaxies are presented. These observations were performed with the NRAO Green Bank 300-ft telescope and the three-element interferometer at 11 cm. From the assumed homogeneous distribution of 4C sources on the sky, one expects statistically that 36 +- 11 out of a total of 149 coincidences are truly associated with Zwicky clusters of delta>+20/sup 0/. Eighteen of these 4C sources lie in Abell clusters, leaving 18 +- 11 expected associations with non-Abell Zwicky clusters. The most probable background sources were isolated from the sample by examination of the optical fields. In the subsample of background coincidences, it was found that 4C sources associated with blank fields or sources whose ID's brightness are inconsistent by several magnitudes with that expected for true Zwicky cluster galaxies are typically <1' in size. Twenty-four of the remaining 28 potential cluster sources are identified with diffuse, galaxylike objects and are generally >1'.

• Research Organization: National Radio Astronomy Observatory, Edgemont Road, Charlottesville, Virginia 22901
• OSTI ID: 6715689
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 83:10; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics &amp; Cosmology-- Quasi-Stellar
Radio
&amp; X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTENNAS
COSMIC RADIO SOURCES
COSMIC RAY FLUX
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUX DENSITY
GALAXIES
GALAXY CLUSTERS
INTERFEROMETRY
RADIATION FLUX
RADIO EQUIPMENT
RADIO GALAXIES
RADIO TELESCOPES
TELESCOPES