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.