Pulsars with lwa1 Paul S. Ray and Sean Cutchin Naval Research Laboratory 2012 July 26


НазваPulsars with lwa1 Paul S. Ray and Sean Cutchin Naval Research Laboratory 2012 July 26
Дата конвертації20.05.2013
Розмір445 b.
ТипПрезентации


Pulsars with LWA1

Paul S. Ray and Sean Cutchin

Naval Research Laboratory

2012 July 26





LWA1 Pulsar Detections



Elevation/Pointing?











RFI Examples

  • Generally benign RFI environment

    • ~1% of data flagged as bad
  • Something strange going on, however

    • Similar RFI showing up in both tunings
    • Looks like internal issue in DRX???
    • Or, crazy software problem??








Fermi Blind Search Pulsars

  • Long data sets make traditional FFT searches extremely computationally expensive

  • Difference search algorithm (Atwood et al. 2006) greatly reduces computational requirements

  • 36 blind search pulsars discovered so far

  • Deeper searches, with sensitivity to isolated MSPs, now running on Einstein@Home



Radio Limits



CFP2 Proposal

  • Search Geminga and the 30 radio-quiet Fermi blind search pulsars with Decl > –33 and any new discoveries

  • 4 hour DRX observation each with 2 tunings at 38 and 74 MHz

  • Pulsars are timed with Fermi LAT so analysis only requires folding and a search over DM





Pulsar Spectral Index Distribution



Observation Summary

  • Observation summary of what we have in the can so far

  • Need to keep spreadsheet up to date with observation status and results including clipping percentages

    • https://docs.google.com/spreadsheet/ccc?key=0AhWARO__2H7gdFdVWGlFWG43ZGVqcWE2RW5ObTdOd1E
    • Soon adding columns for clipping % and analysis status


Next Steps

  • Start looking at profile evolution vs frequency and dispersion/scattering

  • Look at spectra across our band (hard; needs flux calibration)

  • B0950+08 is nice and bright. Analyze for AIPs, and do other single pulse studies

  • Process all B1133+16 data and demonstrate phase connected timing across many days

  • Reduce MSP data with coherent dedispersion

  • Start looking at polarization, esp if we can detect B1929+10



Summary

  • Lots of good pulsar science to be done with LWA1

  • Possible exciting results quickly if we detect Geminga or other radio quiet pulsar

  • Other science requires more instrumental understanding like polarization and flux calibration

  • Should have timing precision soon

  • More observations and analysis work needed!

  • Kevin will describe software and survey plans



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