A GMRT Narrowband vs. Wideband Analysis of the ACT-CLJ0034.4+0225 Field
  Selected from the ACTPol Cluster Sample
  Low frequency radio observations of galaxy clusters are a useful probe of the
non-thermal intracluster medium (ICM), through observations of diffuse radio
emission such as radio halos and relics. Current formation theories cannot
fully account for some of the observed properties of this emission. In this
study, we focus on the development of interferometric techniques for extracting
extended, faint diffuse emissions in the presence of bright, compact sources in
wide-field and broadband continuum imaging data. We aim to apply these
techniques to the study of radio halos, relics and radio mini-halos using a
uniformly selected and complete sample of galaxy clusters selected via the
Sunyaev-Zel'dovich (SZ) effect by the Atacama Cosmology Telescope (ACT)
project, and its polarimetric extension (ACTPol). We use the upgraded Giant
Metrewave Radio Telescope (uGMRT) for targeted radio observations of a sample
of 40 clusters. We present an overview of our sample, confirm the detection of
a radio halo in ACT-CL J0034.4+0225, and compare the narrowband and wideband
analysis results for this cluster. Due to the complexity of the ACT-CL
J0034.4+0225 field, we use three pipelines to process the wideband data. We
conclude that the experimental SPAM wideband pipeline produces the best results
for this particular field. However, due to the severe artefacts in the field,
further analysis is required to improve the image quality.
