We report on high-resolution JVLA and Chandra observations of the HST Frontier Cluster MACS J0717.5+3745 .
MACS J0717.5+3745 offers the largest contiguous magnified area of any known cluster , making it a promising target to search for lensed radio and X-ray sources .
With the high-resolution 1.0–6.5 GHz JVLA imaging in A and B configuration , we detect a total of 51 compact radio sources within the area covered by the HST imaging .
Within this sample we find 7 lensed sources with amplification factors larger than 2 .
None of these sources are identified as multiply-lensed .
Based on the radio luminosities , the majority of these sources are likely star forming galaxies with star formation rates of 10–50 M _ { \odot } yr ^ { -1 } located at 1 \lesssim z \lesssim 2 .
Two of the lensed radio sources are also detected in the Chandra image of the cluster .
These two sources are likely AGN , given their 2 - 10 keV X-ray luminosities of \sim 10 ^ { 43 - 44 } erg s ^ { -1 } .
From the derived radio luminosity function , we find evidence for an increase in the number density of radio sources at 0.6 < z < 2.0 , compared to a z < 0.3 sample .
Our observations indicate that deep radio imaging of lensing clusters can be used to study star forming galaxies , with star formation rates as low as \sim 10 M _ { \odot } yr ^ { -1 } , at the peak of cosmic star formation history .