Modern Interferometric Arrays

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Presentation transcript:

Modern Interferometric Arrays Fundamentals of Radio Interferometry: Chapter 1, Section 11 Dr. Griffin Foster SKA-SA/Rhodes University NASSP 2016

Karoo Array Telescope (KAT-7) Band L Tsys < 35 K Start Frequency 1200 MHz Stop Frequency 1950 MHz Total Bandwidth 750 MHz Inst. Bandwidth 256 MHz Frac. Bandwidth 0.14 - 0.19 Polarization Dual Linear Optics Prime Focus Diameter 12 m Resolution (at 1.4 GHz) 1.22 deg Feed NASSP 2016

Karoo Array Telescope (KAT-7) Number of Elements 7 Min. Baseline 26 m Min. Resolution (@ 1.4 GHz) 0.56 deg Max. Baseline 185 m Max. Resolution (@ 1.4 GHz) 4.7' NASSP 2016

Fractional Bandwidth: Total Bandwidth: bandwidth available based on the analogue filters of the feeds. Instantaneous Bandwidth: bandwidth available based on the digital front-end. Fractional Bandwidth: NASSP 2016

MeerKAT Band UHF L Tsys < 38 K < 30 K Start Frequency 580 MHz Stop Frequency 1015 MHz 1670 MHz Total Bandwidth 435 MHz 770 MHz Inst. Bandwidth 544 MHz 856 MHz Frac. Bandwidth 0.55 0.6 Polarization Dual Linear Optics Offset Gregorian Diameter 13.5 m Resolution (at 1.4 GHz) 1.09 deg NASSP 2016

What do you call it? Telescope or Antenna or Dish or Element NASSP 2016

MeerKAT Number of Elements 64 Min. Baseline 29 m Min. Resolution (@ 1.4 GHz) 0.51 deg Max. Baseline 8 km Max. Resolution (@ 1.4 GHz) 6.6” NASSP 2016

Number of baselines (unique pairs*) Baseline and Visibilities Measurements in an interferometric arrays are made with pairs of telescopes. The measurement is called a visibility (also called a cross-correlation). Number of baselines (unique pairs*) *This does not include the self measurement (or zero baseline), also called the auto-correlation. NASSP 2016

The Karl G. Jansky Very Large Array (JVLA) Optics Cassegrain Diameter 25 m Resolution (at 1.4 GHz) 0.56 deg NASSP 2016

The Karl G. Jansky Very Large Array (JVLA) NASSP 2016

The Low Frequency Array (LOFAR) NASSP 2016

Very-Long Baseline Interferometry (VLBI) NASSP 2016

See Chapter 1, Section 11 for more examples Many more... See Chapter 1, Section 11 for more examples NASSP 2016