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Sardinia Radio Telescope, the VLBA and the HSA

Sardinia Radio Telescope, the VLBA and the HSA. Luigina Feretti INAF Istituto di Radioastronomia Bologna, Italy. The Sardinia Radio Telescope. Fully steerable dish, alt-azimuth mounting, Diameter: 64 m, 3000 tons Frequency range : 300 MHz – 100 GHz

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Sardinia Radio Telescope, the VLBA and the HSA

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  1. Sardinia Radio Telescope, the VLBA and the HSA Luigina Feretti INAF Istituto di Radioastronomia Bologna, Italy

  2. The Sardinia Radio Telescope • Fully steerable dish, alt-azimuth mounting, Diameter: 64 m, 3000 tons • Frequency range : 300 MHz – 100 GHz • Actively controlled surface : 1008 panels, • 1116 mechanical actuators • Multiple focal positions : P, G, BWG • Frequency agility • - State-of-art receivers (multi-beam) - Digital back-ends - Fiber optic connection • Transmitting capability

  3. S. Basilio Quality of the site: Low rain Low atm opacity Low RFI Low wind

  4. 22 May 2010 Big Lift : 500 tons 30 May 2010 Quadrupode Lift

  5. July 2010 January 2011

  6. RECEIVERS 310-420 MHz 1.3-1.8 GHz Primary focus 5.7-7.7 GHzMono-feed BWG focus 18-26 GHzMulti-feed 7 pixels Gregorian focus First light: 4 BANDs BACK-ENDS Digital Spectrometer Pulsars 1 GHz BW, 1024 channels Dual Band Spectrometer 60 MHz BW Total Power Analogic Back-end 7x2 outputs, 2 GHz BW

  7. Observing time (in %) with an expected atmospheric opacity τ<0.1 23.8 GHz31.4 GHz100 GHz(Ambrosini et al.) (23.8 and 31.4 GHz measured, 100 GHz extrapolated)

  8. Radio Astronomy Science ●VLBI – eVLBI : x2 sensitivity up to 22 GHz x5 at higher freq mm-VLBI 43 GHz (7 mm)  86 GHz (3 mm) [GMVA, ALMA] ● Italian VLBI ● Single dish Space ScienceASI (20%) ● Data down link ● Space science : Radio science, Deep Space Network

  9. VLBA + SRT Several Groups use VLBA in Italy: Bologna - low lum RS, young RS, RS with gamma emission Fi (Arcetri ) – Galactic Masers Ca and Megamasers

  10. -20 10 40 70

  11. Sensitivity improvement DEC= 30o 22 GHz : 27% 5 GHz : 45% 1.6 GHz : 45%

  12. HSA + SRT

  13. Full tracks -20 10 30 60

  14. Sensitivityimprovement 22 GHz : 10 % 5 GHz : 10 %  16 % (no Arecibo) 1.6 GHz : 8 %  15 % “

  15. Future receiver : 43 GHz, dual feed (?) Use of SRT : ASI : 20 % VLBI - eVLBI : EVN, Space VLBI, … Single dish

  16. Thank you

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