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SKADS Science Overview

SKADS Science Overview. SKADS Science Overview. SKA Science Case SKADS Science Interactions. Strong Field Tests of Gravity. Binary orbit permits determination of masses. Relativistic effects permit (re) determination of masses. ALL MUST AGREE. http://www.jb.man.ac.uk/~pulsar/.

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SKADS Science Overview

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  1. SKADS Science Overview Lisbon 2007 Jan 12

  2. SKADS Science Overview • SKA Science Case • SKADS Science Interactions Lisbon 2007 Jan 12

  3. Strong Field Tests of Gravity Binary orbit permits determination of masses Relativistic effects permit (re) determination of masses. ALL MUST AGREE http://www.jb.man.ac.uk/~pulsar/ Lisbon 2007 Jan 12

  4. Strong Field Tests of Gravity • Large surveys will find exotic binarys • ~20 000 pulsars in the galaxy • Edge-on Pulsar – Black-hole binary (at least one) • Probe eg. Frame dragging • Pulsar timing array • Gravitational wave background Lisbon 2007 Jan 12

  5. Probing the Dark Ages • When did the first luminous objects form? • How did they form and over what period of time? • SKA will detect the Epoch of Reionisation and map the evolution history of the first luminous objects Lisbon 2007 Jan 12

  6. Large Scale Structure Billions of galaxies! Local hydrogen Hydrogen in a distant galaxy Lisbon 2007 Jan 12

  7. Precision Cosmology 1% ! Lisbon 2007 Jan 12

  8. Cosmic Magnetism • Origin of magnetic fields • Dynamo? • Primordial? Lisbon 2007 Jan 12

  9. Cradle of Life • Protoplanetary disks resolved to Earth-like orbits • Organic molecules • Extrasolar planets • Extra terrestrial intelligence Lisbon 2007 Jan 12

  10. Transient signal Lisbon 2007 Jan 12

  11. Transients • Pulsar is a special case of transient phenomena (periodic) • Giant pulses • Supernova • Bursters • ETI Lisbon 2007 Jan 12

  12. The Unknown • New discoveries always result from observations in new parameter space • sensitivity • spatial resolution • spectral resolution • polarisation • time domain • observing speed (multibeaming) • eg. CMB, pulsars, extra solar planets,… SKA improves all of these Lisbon 2007 Jan 12

  13. SKA Science Book Chris Carilli & Steve Rawlings, New Astronomy Reviews, Vol.48, Elsevier, Dec. 2004 www.skatelescope.org Lisbon 2007 Jan 12

  14. SKADS Science Interactions The Universe observations Data analysis (DS2) science goals achievable? Our understanding of the Universe brain power Request spec changeBENCHMARK Sky Simulation (DS2T1) Simulated telescope image Catalogs, images, EM fields Technology development (DS4) Convolution with the telescope (DS2T2) Data imaging(DS2T2) measurementsandsimulated performance voltages Network simulator (DS3T3) Technology demonstrators(DS5 & DS6) Backend data Lisbon 2007 Jan 12

  15. SKADS Science Interactions The Universe NO: not technologically feasible NO: too expensive observations Data analysis (DS2) science goals achievable? Our understanding of the Universe brain power Request spec changeBENCHMARK Consider trade-offs Sky Simulation (DS2T1) Simulated telescope image Catalogs, images, EM fields Technology development (DS4) Convolution with the telescope (DS2T2) Data imaging(DS2T2) measurementsandsimulated performance voltages Network simulator (DS3T3) Technology demonstrators(DS5 & DS6) Backend data Lisbon 2007 Jan 12

  16. SKADS Benchmark • Special case of the SKA reference design • 100MHz – 300MHz sparse phased array (eg. LOFAR) • 300MHz - ~2GHz dense phased array (eg. EMBRACE) • >2GHz 6m dishes with FPA • The benchmark is evolving… • www.skads-eu.org • Select “benchmark” Lisbon 2007 Jan 12

  17. DS2 Participants and work packages • Line HI Surveys – Oxford, Groningen, Swinburne • Continuum Surveys – Oxford, Leiden, Lisbon • Pulsar Surveys – Manchester • EOR – Paris, Lisbon, Oxford • Magnetism – Cambridge, Bonn • Cradle of Life – no explicit SKADS effort Lisbon 2007 Jan 12

  18. DS2 Broad Role • Provide Simulated Skies (output to DS2-T2) • Quantify Science Return Versus Design for FOV, A/Tsys etc (input from DS2-T2) • Respond To Changing Science Environment • Deliverables: simulated skies and quantified design constraints Lisbon 2007 Jan 12

  19. Multibeam & Multitasking Lisbon 2007 Jan 12

  20. DS2 & SKADS Technical Programme Original goals of DS2 complimentary to SKADS Technical Developments: • EMBRACE (European Multi-beam Radio Astronomy Concept) - DS5 • Low-frequency bias in the original DS2 proposal and description of work European astronomers quick to recognise potential of Aperture Array: • “All sky” coverage, extremely wide-field of view • Frequency coverage (0.3 - 1.4 GHz) • Independently steerable, multiple fields-of-view (beams), experimental science…? • Transient buffer (data “replay”) capability • Instantaneous response to externally triggered events • Software telescope (clear upgrade path that follows Moore’s law) Lisbon 2007 Jan 12

  21. Evaluation of EMBRACE (DS5T3) • Demonstrate that EMBRACE can be used for astronomical observations • Pulsar timing • Multibeam pulsar timing • HI mapping • Continuum mapping • Source tracking • Observations in the presence of strong sources (moon, sun) • Correlation with long baseline (Westerbork – Nançay) • Engineering/characterisation testing • Beam profile, Tsys, Aeff, etc, Lisbon 2007 Jan 12

  22. Science Advisory Group • Advise Project Scientist • Key science projects • SKA related results (theory and observation) • Modifications to benchmark • 4 members plus Project Scientist • 6 meetings per year (teleconference) (terms of reference and members under discussion) Lisbon 2007 Jan 12

  23. SKADS Science Activities • Sky simulations: DS2T1 • Already active involvement from Portugal • SKADS needs input on Crade of Life projects • Telescope simulations and configuration studies DS2T2 • Evaluation of EMBRACE DS5T3 • Evolution of Benchmark • SKADS Science Advisory Group Lisbon 2007 Jan 12

  24. Contact Steve Torchinsky SKADS Project Scientist Observatoire de Paris Phone: +33 1 45 07 75 02 Email: projsci@skads-eu.org Web: http://www.skads-eu.org Lisbon 2007 Jan 12

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