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FAST Low Frequency Pulsar Survey

FAST Low Frequency Pulsar Survey. Youling Yue ( 岳友岭 ) FAST Project, NAOC PKU Astrophysics Colloquium 2012. outline. Current FAST receivers Receiver for early pulsar survey: Low frequency (~400MHz) 7-beam receiver Pulsar survey simulation using PSRPOP Gravitational wave detection limits

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FAST Low Frequency Pulsar Survey

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  1. FASTLow Frequency Pulsar Survey YoulingYue (岳友岭) FASTProject, NAOC PKU Astrophysics Colloquium 2012

  2. outline • Current FAST receivers • Receiver for early pulsar survey: Low frequency (~400MHz) 7-beam receiver • Pulsar survey simulation using PSRPOP • Gravitational wave detection limits • RFI • Single beam wideband receiver

  3. FAST receivers From C. J. Jin

  4. Need a receiver • To work at low frequency (<1GHz) to meet early stage pointing accuracy • To do a whole FAST sky pulsar survey (L-band 19-beam is not the best one)

  5. 7-beam receiver • Propose to build a 7-beam receiver for early drift-scan pulsar survey, freq ~400-560MHz • Similar design like current multibeam receivers, easy to build, ready in early 2016 ParkesEffelsberg Arecibo FAST

  6. Pulsar science for 7-beam receiver • Low frequency drift-scan pulsar survey • Detect ~2300normal pulsar (~1700 new) • Detect ~300MSP (~200 new), good for GW detection • M31/M33 pulsar survey (tracking) • Radio transient survey • Use same data set (piggyback) • good option for a whole FAST sky (2.3π) survey before PAF receiver is available

  7. 7-beam receiver details • Optimized for pulsar (transients) survey at early science stage (Sept 2016 or earlier) • Freq ~400MHz, BW ~150MHz (1/3 freq) • Cooled, Tsys without sky ~30K or less • Light weight • Horn, dipole, etc, not PAF • Inexpensive (maybe <1 Million USD) • Use 19-beam backends • data ~2.4PB (one whole FAST sky scan)

  8. Drift survey simulation with PSRPOP • FAST sky drift-scan survey for pulsar • Integration time ~40s at 400MHz • Two working case • Spherical surface, illuminated aperture Dill decrease as frequency increase, Dill ~ 200m*(f/400MHz)^1/4 (very early stage) • 300m diameter parabola • Two population • Normal pulsar • Millisecond pulsar

  9. Drift survey simulation PSRPOP Blue: ~100k pulsar generated Red: ~2300 detected by FAST PSRPOP website: http://psrpop.sourceforge.net/

  10. spherical surface BW = 1/3 freq Integration time ~60s *(400MHz/freq) Dill ~ 200m at 400MHz Number of Normal pulsar detected

  11. 300m parabola BW = 1/3 freq Integration time ~40s *(400MHz/freq) 400MHz side is favored because of faster survey speed Number of Normal pulsar detected

  12. For comparison, FAST L-band suvey will detect ~5000 pulsars (Smits et al. 2009)

  13. MSP survey simulation • Normal pulsar and MSP are of different population: different spectral index, spatial distribution, etc • Change spectral index and spectral index deviation so that the simulation meets both Parkesmultibeam survey and 70cm survey • Search through the parameter space to find the best point

  14. Sample (~100k pulsar) generated by matching PMB results (L-band) Constrain spectral index and its deviation by matching 70cm survey Green region meets the observed ~20 MSPs from 70cm survey

  15. Possible region? Mean –1.6, deviation 0.35 used by Smits et al. 2009

  16. GW detection limits adding new MSP from FAST drift scan survey 36 from IPTA + 40 from FAST plot from K. J. Lee

  17. RFI 2004 final freq and BW depend on RFI

  18. RFI 2005

  19. Single beam wideband receiver for early pulsar timing • Effelsberg, GBT, Parkes, Arecibo are developing or discussing wide band pulsar timing receivers ~500MHz-3GHz~700MHz-4GHz • For FAST pulsar timing • 500MHz-3GHz • For FAST early science ~270MHz-1450MHz • Low end limited by RFI • High end covers HI Akgiray & Weinreb 2011

  20. Thank You Comments are welcome

  21. Possible region? Mean –1.6, deviation 0.35 used by Smits et al. 2009

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