Complex radio emission from the X-ray cluster Abell 2256

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Maps, Extragalactic Radio Sources, Galactic Clusters, X Ray Sources, Astronomical Photography, Compton Effect, Galactic Structure, Photographic Plates, Radio Emission, Red Shift

Scientific paper

A sensitive map has been made of the powerful X-ray cluster Abell 2256 (= 3 U 1706+78) at 610 MHz with a resolution of 55 arcsec. Five discrete radio sources, three of which appear to have head-tail structure, have been identified with cluster galaxies. There are also two extended emission regions near the cluster center which have linear sizes of at least 1 Mpc. The faintest and most diffuse of these extended regions may be the steep-spectrum decametric source detected previously in Abell 2256. Localization of the soft X-ray source to the region of this diffuse emission would provide strong support for the inverse-Compton model of the origin of the X-ray luminosity.

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