Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..461d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 15, 1984, p. 461-470. Research supported by the University of Mi
Astronomy and Astrophysics
Astronomy
119
Continuous Spectra, Galactic Clusters, Radio Galaxies, Infrared Astronomy, Intergalactic Media, Spiral Galaxies
Scientific paper
Observational results are presented of a continuum survey of the Hercules Cluster (A2151) near 1.4 GHz. The observations were carried out using the VLA in the D configuration with a total bandwidth of 25 MHz. Positions and fluxes are given for 65 sources, 21-25 of which are associated with galaxies. Separation between the radio and optical positions of the galaxies was five arcsec for most cases. A group of three small rectangles near the classical center of the Hercules Cluster is examined, and it is found that each rectangle contains one optically bright galaxy and one strongly emitting radio galaxy. It is suggested that these regions are physical subcores of A2151 and that they contain intergalactic gas. Five sources were found with 1.4 GHz fluxes greater than 10 mJy which are not associated with any galaxy. It is conjectured that the galaxyless objects are not background objects, but are instead the result of a plasma effect in the subcore medium. The radio flux of the galaxyless sources correlates well with the 60-micron flux obtained by IRAS for spiral galaxies. A table is presented which lists the sources associated with galaxies.
Dickey John M.
Salpeter Edwin E.
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