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ASTRO 7620 Advanced Radio Astronomy Seminar
A m i t V i s h w a s
SKA Precursors: ASKAP & MEERKaT
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
Australian SKA Pathfinder (ASKAP)
• Located in Western Australia • One of the most Radio Quiet sites in the World.
• Technology Demonstrator in the Mid-frequency Range
• 700MHz – 1.8GHz
• 30 x 12 mts prime focus Paraboloid Reflectors
• Aeff= ~3400 m2 (~1
20 𝐴𝑟𝑒𝑐𝑖𝑏𝑜)
• Expected Max Baseline of ~ 6 kms
• Working Resolution (10”- 30”)
• Designed to be a fast Survey Telescope • FoV and Survey Speed: Focal Phased Array Feeds
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
Array Configuration - ASKAP
May 05, 2010
36 – 12 mts Antennas Inner Dense Array – 1km radius - Min Separation – 22 mts Outer 6 Antennas - Max Separation 6 kms
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ASTRO 7620 Advanced Radio Astronomy Seminar
12m - Parkes Testbed Antenna
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
Karoo Array Telescope (MEERKaT)
• Located near the Northern Cape region of South Africa • Population density (0-2/sq.km) - Low man made RFI
• Technology Demonstrator in the Mid-frequency Range • 900MHz – 1.75GHz
• To be extended with 8 - 14.5 GHz & 580 MHz – 2.5 GHz modes
• 80 x 12 mts prime focus Paraboloid Reflectors
• Aeff= ~9000 m2 (~1
8 𝐴𝑟𝑒𝑐𝑖𝑏𝑜)
• Expected Baseline of ~ 8 kms, Extended ~ 60 kms • Working Resolutions 6” – 80”
• Designed to be an extremely sensitive ‘cm’ wavelength Telescope • Large N small D (LNSD)
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
May 05, 2010
• XDM : Experimental Development Model • 15 mts Antenna, Technology Testbed (2006-2008)
• KAT 7, now MPA • 7- 12mts Antennas at proposed MeerKaT site (in progress)
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ASTRO 7620 Advanced Radio Astronomy Seminar
Array Configuration - MEERKaT
May 05, 2010
80 – 12 mts Antennas Inner Dense Array (70%)– 1km - Min Separation – 20 mts Outer Arms (30%) - Max Baseline – 8 kms 7 Spur Antennas to Baselines of ~ 60 kms
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ASTRO 7620 Advanced Radio Astronomy Seminar
KAT – 7 Buildup
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
Survey Metrics
• 𝑡 = 2 𝑘 𝑇
𝐴 𝑁 ϵ𝑎 ϵ𝑐
2 1
σ𝑠2𝐵 𝑛𝑝
• Integration time for 𝜎𝑠 sensitivity (Jy)
• 𝑆𝑆𝑠 = 𝐹 𝐵𝑛𝑝𝐴 𝑁 ϵ𝑎 ϵ𝑐 σ𝑠
2 𝑘 𝑇
2, @ 𝜎𝑠 sensitivity, F – FoV
• # sq. deg surveyed per second, 𝜖𝑎, 𝜖𝑐 - Aperture & Correlator Efficiency
• 𝑆𝑆𝑡 = 𝐹 𝐵𝑛𝑝ϵ𝑐 σ𝑡
𝑇
2𝑓2 ϵ𝑠
−2, @ 𝜎𝑡 sensitivity (K), f – filling factor
• Surface brightness temperature SS, 𝜖𝑠- synthesized aperture efficiency
• Large N - Small D – Large FoV (- simultaneous FoVs)
• u-v coverage on the Sky with baselines
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
Science Drivers
• Extragalactic HI Science • Evolution of abundance & distribution of HI over different z
• Large Scale HI Survey at intermediate z • For 0.04 ≲ z ≲ 0.2, slightest change in HIMF would result many more
galaxy detections
• Continuum Science • Formation & Evolution of Galaxies, AGNs over time
• Extreme Starburst galaxies over z ~ 6-10 (if they exist)
• Low Luminosity Active Radio galaxies at nearby z (~ 0.5)
• ISM Studies • Better Understanding of Galaxy Evolution through Milky way &
Magellanic Clouds
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
Science Drivers
• Pulsar Studies • Larger Pulsar Surveys (30,000 sq deg)
• Computationally limited, ‘ms’ Pulsars missed • Multiple Simultaneous Observations possible
• Exotic High energy Binary systems (Pulsar-Black hole) • Detect Gravitational Waves (?)
• Polarization Studies • Deep survey of polarized emission from Extragalactic Sources • Gather Rotational Measures -> Cosmic Magnetism
• VLBI Science • AGNs with mas jet features, high dynamic range imaging • Radio counterparts of GRBs, other transients
• Large FoV & High Resolution
• Pulsar proper motion & parallax observations
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
Timeline
• ASKAP • Currently testing at Parkes Testbed
• Moving to BETA (Boolardy Engineering Test Array) around 2011
• 6 – 12 mts antennas at MRO
• Full ASKAP system up and running by 2013 (Planned)
• MPA & MEERKaT • KAT7/MPA in construction at MeerKaT site.
• 7 – 12 mts antennas (middle of nowhere?)
• Remote operations
• Full MEERKaT system up and running around 2014 (Planned)
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
May 05, 2010
2013
2010
Really??
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ASTRO 7620 Advanced Radio Astronomy Seminar
1st ASKAP Antenna at MRO
May 05, 2010
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ASTRO 7620 Advanced Radio Astronomy Seminar
MPA Buildup (April 2010)
May 05, 2010 Check out www.comparethemeerkat.com
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ASTRO 7620 Advanced Radio Astronomy Seminar
References
• ATNF-CSIRO ASKAP Webpage
• http://www.atnf.csiro.au/projects/askap/
• Request for Proposals for MEERKaT
• Heyden, K., Surveying the Sky with MeerKaT, Symposium on Surveying the low frequency sky with LOFAR, Leiden University, NL, March 2010
• Norris, R., Surveying the Sky with ASKAP, Symposium on Surveying the low frequency sky with LOFAR, Leiden University, NL, March 2010
May 05, 2010