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Published byKathryn McCarthy Modified over 9 years ago
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Pulsar Searching + Receivers Matthew Bailes (CAASTRO), FPGAs: Peter Mc Mahon, Terry Fibila, Jonathon Kocz. CPUs: Willem van Straten, Andrew Jameson, Mike Keith GPUs: Ben Barsdell + HITRUN team (Science! & Search coding)
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Magnetic Field - Period Diagram Crab pulsar Pulsars go this way “Noisy” “Smooth”
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Vela Pulsar
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Competition TelescopePoint SourceBlind Survey FoM Computational Complexity PKS MB 111 GBT 25x0.50.4 GMRT 1.7x~1315x [RAM = 327 TB] ASKAP 0.14x4.25x400,000x !!! {RAM=529PB} PALFA 162x5.5x0.5 MeerKAT-64 14.5x40x73,000 !! [RAM=351 TB] PKS WB PKS PAF 2.25x 0.25x (40K?-20K).25x ~1 ~4x 2x ~4x (no acc) ~64x (4x??) Molonglo 30x1 0.16x2.8x0.3x [RAM = 5TB] SKA 256 300x650x73,000 !! [RAM = 21TB]
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HITRUN Pulsar Surveys (Keith et al. 2010) Digital Versions of the Parkes MB Surveys Digital Versions of the Parkes MB Surveys 13 x 1024 x 64 us 13 x 1024 x 64 us Medium-Latitude Survey (540s) Ultra-deep Survey (4000s) All-sky Survey (260s) Better for high-DM MSPs Better for high-DM MSPs Better for Lorimer bursts Better for Lorimer bursts Better for RRATs Better for RRATs Deeper than old surveys Deeper than old surveys
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Berkeley-Parkes-Swinburne-Recorder “BPSR” 5 TB/day Dedicated fibre
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Bandpasses
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MSPs HITRUN: 27 MSPs P-ALFA: 15 MSPs? MSP with a main sequence companion (PSR J1903+0327)? FERMI-Related: ~50MSPs Mostly short-period and many close GBT Drift 350 MHz: >6 MSPs?? MSP occasionally super-bright
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Precision Timing: PSR J1017-7156
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A Jupiter-mass “Planet” Pulsar M c ~ 0.001 M o P orb ~ 0.0907d D ~ 1.2 kpc?
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MSP Luminosity Function (Levin et al.)
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RAW Cleaned
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Barsdell’s Heimdall Real-time RRAT Detector
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BAD RFI EXAMPLE
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Dan Thornton (U Manchester) DM >> Lorimer Burst ! Well off galactic plane. One beam Only Instrumentation Perfect Allows detailed studies
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In future capable of finding in real time Heimdall plot of Thornton’s burst.
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Burst Profile Scatter Tail (nu^-4.0(4) Freq index -2.000(6) ~50 sigma
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Search SNR PSR flux
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Computational complexity PSR flux
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Competition TelescopePoint SourceBlind Survey FoM Computational Complexity PKS MB 111 GBT 25x0.50.4 GMRT 1.7x~1315x [RAM = 327 TB] ASKAP 0.14x4.25x400,000x !!! {RAM=529PB} PALFA 162x5.5x0.5 MeerKAT-64 14.5x40x73,000 !! [RAM=351 TB] PKS WB PKS PAF 2.25x 0.25x (40K?-20K).25x ~1 ~4x 2x ~4x (no acc) ~64x (4x??) Molonglo 30x1 0.16x2.8x0.3x [RAM = 5TB] SKA 256 300x650x73,000 !! [RAM = 21TB]
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Conclusions Wideband feed complements the MB: Good for point sources Good for follow-ups Limited RFI excision? Parallel system? PAF: Tsys/Aeff critical: 2x MB (marginal) 1x MB (excellent) MultiBeam: Currently #1 instrument for PSR and Burst surveys RFI excision should be mirrored on PAFs?
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1909-3744 8s dumps!
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Peryton Examples (Burke-Spolaor et al) Ugly, Fat.
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