We present new observations of the galaxy cluster 3C 129 obtained with the Sardinia Radio Telescope in the frequency range 6000 - 7200 MHz , with the aim to image the large-angular-scale emission at high-frequency of the radio sources located in this cluster of galaxies .
The data were acquired using the recently-commissioned ROACH2-based backend to produce full-Stokes image cubes of an area of 1 ^ { o } \times 1 ^ { o } centered on the radio source 3C 129 .
We modeled and deconvolved the telescope beam pattern from the data .
We also measured the instrumental polarization beam patterns to correct the polarization images for off-axis instrumental polarization .
Total intensity images at an angular resolution of 2.9 \arcmin were obtained for the tailed radio galaxy 3C 129 and for 13 more sources in the field , including 3C 129.1 at the galaxy cluster center .
These data were used , in combination with literature data at lower frequencies , to derive the variation of the synchrotron spectrum of 3C 129 along the tail of the radio source .
If the magnetic field is at the equipartition value , we showed that the lifetimes of radiating electrons result in a radiative age for 3C 129 of t _ { syn } \simeq 267 \pm 26 Myrs .
Assuming a linear projected length of 488 kpc for the tail , we deduced that 3C 129 is moving supersonically with a Mach number of M = v _ { gal } / c _ { s } = 1.47 .
Linearly polarized emission was clearly detected for both 3C 129 and 3C 129.1 .
The linear polarization measured for 3C 129 reaches levels as high as 70 % in the faintest region of the source where the magnetic field is aligned with the direction of the tail .