The radio halo coming from Abell 1213 is somewhat of a puzzle to astronomers.
, comprised of 28 radio antennas spread across the Plains of New Mexico, revealed the presence of a diffuse extended emission from the cluster.
SDSS g-band image of the galaxy cluster Abell 1213 with, superimposed, the contour levels of the VLA 1.4 GHz radio image. This indicates that instead of being a radio halo, the source of this emission is actually the tail of 4C29.41, a radio galaxy at the heart of the cluster that dominates the cluster alongside two other radio galaxies. The team proposes that this tail has been curved by interaction with Abell 1213's intracluster medium, the superheated plasma spread throughout the cluster between galaxies.
"The spectral index map of the radio source is compatible with a relic interpretation, possibly due to a merger in the N-S or NE-SW direction, in agreement with the substructures detected through the optical analysis," the astronomers write."The fragmented, diffuse radio emissions at the cluster center could be the surface brightness peaks of a faint central radio halo."
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