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Optimal Frequency Ranges for Sub-Microsecond Precision Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017

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Page 1: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Optimal Frequency Ranges for Sub­Microsecond Precision 

Pulsar TimingMichael T. Lam

Transformative Science with GBO, 17 Oct 2017

Page 2: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency­Dependent Effects

Page 3: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency­Dependent Effects

Lorimer & Kramer 2005

Page 4: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency Optimization

Lam et al. 2017, submitted

Page 5: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

BR: Dolch et al. 2014

Page 6: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

BR: NANOGrav Data

Page 7: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

BR: Cordes et al 2016

MR: Cordes et al 1986

TR: Lam et al 2016b

Page 8: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

BR: Green Bank RFI Scans

TR: Gentile et al in prep

Page 9: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency Optimization

Lam et al. 2017, submitted

Page 10: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency Optimization

Lam et al. 2017, submitted

Page 11: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency Optimization

Lam et al. 2017, submitted

Page 12: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency Optimization

Lam et al. 2017, submitted

Page 13: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Frequency Optimization

Lam et al. 2017, submitted

Page 14: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

Points to Remember

­ Wideband receiver   > System Temperature ↑ ↑

­ Multiple receivers can provide coverage

­ Do NOT reduce bandwidth

­ Timing RMS can be very different

­ PTA optimization is an ongoing effort

Page 15: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]
Page 16: Optimal Frequency Ranges for SubMicrosecond Precision Pulsar …2017. 10. 17. · Pulsar Timing Michael T. Lam Transformative Science with GBO, 17 Oct 2017. ... 150 100 UT [June 23]

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