Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...39..215h&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 39, Feb. 1980, p. 215-233.
Astronomy and Astrophysics
Astronomy
82
Galactic Clusters, Microwave Spectra, Radio Galaxies, Astronomical Observatories, Brightness Temperature, Radio Astronomy
Scientific paper
Observations of A401, A1446, A1452, A1775, A2220, A2250, A2255, and A2306 are presented at 1415 MHz with supplementary observations at 610 or 4995 MHz for most of the clusters. Positions, intensities, and optical identifications are tabulated for all the sources found in the 8 fields, and contour diagrams are given for sources of complex brightness distribution. The nature of the low-frequency (less than 100 MHz) emission for 3 clusters is discussed on the basis of our spectral data. As an alternative to the usual model of radio halos residing in the core of clusters, it is suggested that nonthermal (and perhaps thermal) emission may arise at an interface between subclusters which are in the process of coalescing.
Ekers Ron D.
Harris Daniel E.
Kapahi Vijay K.
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