Abell 1033: Radio halo and gently reenergized tail at 54 MHz

Abell 1033 is a merging galaxy cluster of moderate mass ($M_{500}=3.2\times10^{14} \mathrm{M}_\odot$). It hosts broad variety diffuse radio sources linked to different astrophysical phenomena. The most peculiar one an elongated feature with ultra-steep spectrum that the prototype category gently reenergized tails (GReET). Furthermore, were previously classified as phoenix and halo. We aim improve understanding cosmic-ray acceleration mechanisms in clusters frequency range has been poorly explored so far. To investigate synchrotron emission cluster, we performed full calibration LOFAR observation centered at 54 MHz. analyzed this together re-calibrated data LoTSS 144 MHz archival GMRT 323 spectral study tail connected GReET test if current interpretation source agreement observational evidence below 100 Additionally, studied halo frequencies. report extreme curvature for GReET, index flattens from $\alpha_{144}^{323} = -4$ $\alpha_{54}^{144} -2$. This indicates presence cut-off electron energy spectrum. At center, detect 54, lower significance categorize it $\alpha -1.65 \pm 0.17$. found be significantly above power-to-cluster correlations reported literature. further steepen between MHz, break spectrum, which prediction homogeneous re-acceleration models.