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Sardinia Radio Telescope, the VLBA and the HSA

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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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Presentation Transcript
slide1

Sardinia Radio Telescope,

the VLBA and the HSA

Luigina Feretti

INAF Istituto di Radioastronomia

Bologna, Italy

slide2

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
slide4

S. Basilio

Quality of the site: Low rain

Low atm opacity

Low RFI

Low wind

slide5

22 May 2010

Big Lift : 500 tons

30 May 2010

Quadrupode

Lift

slide6

July 2010

January 2011

slide7

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

slide8

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)

slide9

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

slide10

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

slide11

-20

10

40

70

slide12

Sensitivity improvement

DEC= 30o

22 GHz : 27%

5 GHz : 45%

1.6 GHz : 45%

slide14

Full tracks

-20

10

30

60

slide15

Sensitivityimprovement

22 GHz : 10 %

5 GHz : 10 %  16 % (no Arecibo)

1.6 GHz : 8 %  15 % “

slide16

Future receiver : 43 GHz, dual feed (?)

Use of SRT :

ASI : 20 %

VLBI - eVLBI : EVN, Space VLBI, …

Single dish