Abstract
Abstract Spectral line search was carried out for the first time with the Northern Cross radiotelescope at Medicina (Italy). The total bandpass of the antenna was sampled and processed in real time with the high resolution digital FFT spectrometer. The radio recombination line of carbon C252α was reliably detected toward Cassiopeia A. The observed line profile is composed of 3 emission components at positions -47 km s−1, -38 km s−1 and 0 km s−1 and relative intensities as 3:2:1. The detection of the component at zero velocity is of special importance since there has been only one measurement of such an emission made at 325 MHz.
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