SKADS Science Overview

Lisbon 2007 Jan 12 Steve TorchinskySKADS Science Overview

SKADS Science OverviewSKADS Science Overview


SKADS Science OverviewSKADS Science Overview

• SKA Science Case

• SKADS Science Interactions


Strong Field Tests of GravityStrong 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/


Strong Field Tests of GravityStrong 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


Probing the Dark AgesProbing 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


Local hydrogen

Hydrogen in a distant galaxy

Billions of galaxies!

Large Scale StructureLarge Scale Structure


1% !

Precision CosmologyPrecision Cosmology


Cosmic MagnetismCosmic Magnetism

• Origin of magnetic fields– Dynamo?

– Primordial?


Cradle of LifeCradle of Life

• Protoplanetary disks resolved to Earth-like orbits

• Organic molecules

• Extrasolar planets

• Extra terrestrial intelligence


Transient signalTransient signal


TransientsTransients

• Pulsar is a special case of transient phenomena (periodic)

• Giant pulses

• Supernova

• Bursters

• ETI


The UnknownThe 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


SKA Science BookSKA Science Book

Chris Carilli & Steve Rawlings,

New Astronomy Reviews, Vol.48, Elsevier, Dec. 2004

www.skatelescope.org


SKADS Science InteractionsSKADS Science InteractionsThe Universe

Our understanding of the Universe

Sky Simulation (DS2T1)

Convolution with the telescope (DS2T2)

Network simulator (DS3T3)

Technology development

(DS4)

Technology demonstrators(DS5 & DS6)

observations

brain power

Catalogs, images, EM fields

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Backend data

Data imaging(DS2T2)

Simulated telescope image

Data analysis (DS2)

science goals achievable?


SKADS Science InteractionsSKADS Science InteractionsThe Universe

Our understanding of the Universe

Sky Simulation (DS2T1)

Convolution with the telescope (DS2T2)

Network simulator (DS3T3)

Technology development

(DS4)

Technology demonstrators(DS5 & DS6)

observations

brain power

voltages

mea

sure

men

tsan

dsi

mu

late

d pe

rfor

man

ce

Backend data

Data imaging(DS2T2)

Simulated telescope image

Data analysis (DS2)

science goals achievable?

NO: not technologically feasible

NO: too expensive

Consider trade-offs

Request spec changeBENCHMARK

Catalogs, images, EM fields


SKADS BenchmarkSKADS 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”


DS2 Participants and work packages 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


DS2 Broad Role 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


Multibeam & MultitaskingMultibeam & Multitasking


DS2 & SKADS Technical ProgrammeDS2 & 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:

1. “All sky” coverage, extremely wide-field of view2. Frequency coverage (0.3 - 1.4 GHz)3. Independently steerable, multiple fields-of-view (beams), experimental

science…?4. Transient buffer (data “replay”) capability5. Instantaneous response to externally triggered events 6. Software telescope (clear upgrade path that follows Moore’s law)


Evaluation of EMBRACE (DS5T3)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,


Science Advisory GroupScience 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)


SKADS Science ActivitiesSKADS 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


ContactContact

Steve TorchinskySKADS Project ScientistObservatoire de Paris

Phone: +33 1 45 07 75 02Email: [email protected]: http://www.skads-eu.org

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SKADS Science Overview

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