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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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Sardinia radio telescope the vlba and the hsa

Sardinia Radio Telescope,

the VLBA and the HSA

Luigina Feretti

INAF Istituto di Radioastronomia

Bologna, Italy


Sardinia radio telescope the vlba and the hsa

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


Sardinia radio telescope the vlba and the hsa

S. Basilio

Quality of the site: Low rain

Low atm opacity

Low RFI

Low wind


Sardinia radio telescope the vlba and the hsa

22 May 2010

Big Lift : 500 tons

30 May 2010

Quadrupode

Lift


Sardinia radio telescope the vlba and the hsa

July 2010

January 2011


Sardinia radio telescope the vlba and the hsa

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


Sardinia radio telescope the vlba and the hsa

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)


Sardinia radio telescope the vlba and the hsa

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


Sardinia radio telescope the vlba and the hsa

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


Sardinia radio telescope the vlba and the hsa

-20

10

40

70


Sardinia radio telescope the vlba and the hsa

Sensitivity improvement

DEC= 30o

22 GHz : 27%

5 GHz : 45%

1.6 GHz : 45%


Sardinia radio telescope the vlba and the hsa

HSA + SRT


Sardinia radio telescope the vlba and the hsa

Full tracks

-20

10

30

60


Sardinia radio telescope the vlba and the hsa

Sensitivityimprovement

22 GHz : 10 %

5 GHz : 10 %  16 % (no Arecibo)

1.6 GHz : 8 %  15 % “


Sardinia radio telescope the vlba and the hsa

Future receiver : 43 GHz, dual feed (?)

Use of SRT :

ASI : 20 %

VLBI - eVLBI : EVN, Space VLBI, …

Single dish


Sardinia radio telescope the vlba and the hsa

Thank you


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