Medicina radiotelescope

Medicina radiotelescope (Fig. 5.6). They detected water in this comet when it was only 0.23 AU from the Sun. Moreover, the lines observed were split and showed velocities varying from 22 to 44 km/s. Normally, the outflow velocity of neutral molecules from cometary nuclei is expected at about 1 km/s. These high values of the velocities observed may be explained by the strong solar coronal activity which could have accelerated icy grains. 

Maser detection in the interstellar medium was described by Elitzur, 1987 [118]. Water maser emission at 22 GHz may be a hint for cometary impacts that occur in extrasolar planetary systems. Such radiosignatures were proposed by Cos-movici et al., 2001 [79]. During the impact of comet Shoemaker-Levy 1994 on Jupiter observations made with the 32-m dish Medicina radiotelescope (Bolgna, Italy) revealed the delivery of water and for the first time also a water maser in the solar system. After the comet s nucleus exploded in the upper part of Jupiter s atmosphere, this maser was produced. 

Abstract. New results of the Primordial Helium abundance (Yp) measurement by radio recombination line (RRL) observations from five galactic HII regions are presented. The RRL observations were carried out with two telescopes RT32 (22.4 and 8.3 GHz, Medicina, Italy) and RT22 (36.5 and 22.4 GHz, Pushchino, Russia). The results of the first run of the low frequency RRL observations (408 MHz) with the Croce del Nord radiotelescope (Medicina Observatory, Italy) are also presented. 

Fig. 5.6 The Medicina 32 m radiotelescope. The 32 m parabola is used both in single dish and for interferometric observations. The frequency coverage is between 1.4 and 22 GHz...

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