pulsar searching + receivers
DESCRIPTION
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). Crab pulsar. Pulsars go this way. - PowerPoint PPT PresentationTRANSCRIPT
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.