pulsar searching + receivers matthew bailes (caastro), fpgas: peter mc mahon, terry fibila, jonathon...

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 DiagramCrab pulsar

Pulsars gothis way

“Noisy”

“Smooth”

Vela Pulsar

CompetitionTelescope Point Source Blind

Survey FoM

Computational Complexity

PKS MB 1 1 1

GBT 25x 0.5 0.4

GMRT 1.7x ~1 315x [RAM = 327 TB]

ASKAP 0.14x 4.25x 400,000x !!! {RAM=529PB}

PALFA 162x 5.5x 0.5

MeerKAT-64 14.5x 40x 73,000 !! [RAM=351 TB]

PKS WBPKS PAF

2.25x0.25x (40K?-20K)

.25x~1 ~4x

2x~4x (no acc) ~64x (4x??)

Molonglo 30x1 0.16x 2.8x 0.3x [RAM = 5TB]

SKA 256 300x 650x 73,000 !! [RAM = 21TB]

HITRUN Pulsar Surveys (Keith et al. 2010)

Digital Versions of the Parkes MB SurveysDigital Versions of the Parkes MB Surveys 13 x 1024 x 64 us13 x 1024 x 64 us

Medium-Latitude Survey (540s)Medium-Latitude Survey (540s) Ultra-deep Survey (4000s)Ultra-deep Survey (4000s) All-sky Survey (260s)All-sky Survey (260s)

Better for high-DM MSPsBetter for high-DM MSPs Better for Lorimer burstsBetter for Lorimer bursts Better for RRATsBetter for RRATs Deeper than old surveysDeeper 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 J1903+0327)?

FERMI-Related: ~50MSPs Mostly short-period and many close

GBT Drift 350 MHz: >6 MSPs?? MSP occasionally super-bright

Precision Timing:PSR J1017-7156

A Jupiter-mass “Planet” Pulsar

Mc~ 0.001 Mo

Porb~ 0.0907d

D ~ 1.2 kpc?

€

ρ >3π

0.463GPb2

mp

mp +mc

MSP Luminosity Function (Levin et al.)

RAW

Cleaned

Barsdell’s Heimdall Real-time RRAT Detector

Barsdell’s Heimdall Real-time RRAT Detector

BAD RFI EXAMPLE

Dan Thornton (U Manchester)DM >> Lorimer Burst ! Well off galactic plane.

One beam Only

InstrumentationPerfect

Allows detailedstudies

In future capable of finding in real time

Heimdall plot of Thornton’s burst.

Burst Profile

Scatter Tail (nu^-4.0(4)Freq index -2.000(6)

~50 sigma

Search SNR

PSR flux

€

SNR = SPSR

G BtNp

(Trec +Tsky )

P −w

w

€

FoM = G2BtNp

(Trec +Tsky )2

P −w

wNbeamFoV

Computational complexity

PSR flux

€

t =T 2

BN pG2

Nacc = t 2

Complexity = B2 NbeamNacc

Complexity = Nbeam

T 4

G4

RAM = BNbeamt

CompetitionTelescope Point Source Blind

Survey FoM

Computational Complexity

PKS MB 1 1 1

GBT 25x 0.5 0.4

GMRT 1.7x ~1 315x [RAM = 327 TB]

ASKAP 0.14x 4.25x 400,000x !!! {RAM=529PB}

PALFA 162x 5.5x 0.5

MeerKAT-64 14.5x 40x 73,000 !! [RAM=351 TB]

PKS WBPKS PAF

2.25x0.25x (40K?-20K)

.25x~1 ~4x

2x~4x (no acc) ~64x (4x??)

Molonglo 30x1 0.16x 2.8x 0.3x [RAM = 5TB]

SKA 256 300x 650x 73,000 !! [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?

1909-3744 8s dumps!

Peryton Examples (Burke-Spolaor et al)

Ugly, Fat.