Pulsar Searching + Receivers Matthew Bailes (CAASTRO), FPGAs: Peter Mc Mahon, Terry Fibila, Jonathon Kocz. CPUs: Willem van Straten, Andrew Jameson, Mike.

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Presentation transcript:

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)

Magnetic Field - Period Diagram Crab pulsar Pulsars go this way “Noisy” “Smooth”

Vela Pulsar

Competition TelescopePoint SourceBlind Survey FoM Computational Complexity PKS MB 111 GBT 25x GMRT 1.7x~1315x [RAM = 327 TB] ASKAP 0.14x4.25x400,000x !!! {RAM=529PB} PALFA 162x5.5x0.5 MeerKAT x40x73,000 !! [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 x650x73,000 !! [RAM = 21TB]

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

Berkeley-Parkes-Swinburne-Recorder “BPSR” 5 TB/day Dedicated fibre

Bandpasses

MSPs HITRUN: 27 MSPs P-ALFA: 15 MSPs?  MSP with a main sequence companion  (PSR J )? FERMI-Related: ~50MSPs  Mostly short-period and many close GBT Drift 350 MHz: >6 MSPs??  MSP occasionally super-bright

Precision Timing: PSR J

A Jupiter-mass “Planet” Pulsar M c ~ M o P orb ~ d D ~ 1.2 kpc?

MSP Luminosity Function (Levin et al.)

RAW Cleaned

Barsdell’s Heimdall Real-time RRAT Detector

BAD RFI EXAMPLE

Dan Thornton (U Manchester) DM >> Lorimer Burst ! Well off galactic plane. One beam Only Instrumentation Perfect Allows detailed studies

In future capable of finding in real time Heimdall plot of Thornton’s burst.

Burst Profile Scatter Tail (nu^-4.0(4) Freq index (6) ~50 sigma

Search SNR PSR flux

Computational complexity PSR flux

Competition TelescopePoint SourceBlind Survey FoM Computational Complexity PKS MB 111 GBT 25x GMRT 1.7x~1315x [RAM = 327 TB] ASKAP 0.14x4.25x400,000x !!! {RAM=529PB} PALFA 162x5.5x0.5 MeerKAT x40x73,000 !! [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 x650x73,000 !! [RAM = 21TB]

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?

s dumps!

Peryton Examples (Burke-Spolaor et al) Ugly, Fat.