The puzzling radio source in the cool core cluster A 2626
  We report on new VLA radio observations performed at 1.4 GHz and 4.8 GHz with
unprecedented sensitivity and angular resolution (~1 arcsec) of the cool core
cluster A 2626, which is known to possess a radio mini-halo at its center. The
most unusual features of A 2626 are two elongated radio features detected in
previous observations to the north and south, having morphologies not common to
the typical jet-lobe structures in cool cores. In our new sensitive images the
two elongated features appears clearly as bright radio arcs, and we discover
the presence of a new arc to the west. These radio arcs are not detected at 4.8
GHz, implying a steep (alpha >1) spectrum, and their origin is puzzling. After
subtracting the flux density contributed by these discrete features from the
total flux measured at low resolution, we estimate a residual 18.0 +/- 1.8 mJy
flux density of diffuse radio emission at 1.4 GHz. We therefore confirm the
detection of diffuse radio emission, which appears distinct from the discrete
radio arcs embedded in it. Although its radio power is lower (1.4x10^23 W/Hz)
than previously known, the diffuse emission may still be classified as a radio
mini-halo.
