Polarization Properties of an Eclipsing Pulsar

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Presentation transcript:

Polarization Properties of an Eclipsing Pulsar Xiaopeng YOU (游霄鹏) 2015 FPS Meeting, Mingantu, Inner-Mongolia

Outline Introduction of J1748-2446A Observation and Data processing Results and discussion Conclusions

Basic properties of J1748-2446A Discovered in 1990, Parkes telescope, 20-cm (Lyne et al., 1990) Locating in the globular cluster Terzan 5 Period : 11.56 ms Dispersion Measure: 242.0 Circular orbital period: 1.8 hours Projected semi-major axis: 0.119 light second Companion: White drawf, 0.089 Mʘ Eclipsing time: variable, depending on frequency, greater than Roche lobe, 0.2 Rʘ Sometimes disappearing

Observations Parkes 64 m telescope 3 frequencies, 1369 MHz (20 cm), 3100 MHz (10 cm), 728 MHz (50 cm), 1369 MHz, Bandwidth: 256 MHz,1024 Channels 3100 MHz, Bandwidth: 1024 MHz,1024 Channels 728 MHz, Bandwidth: 64 MHz,128 Channels Full polarization recording 3 observations at 20cm 2 observations at 10/50 cm. Almost all observations cover whole orbital phase.

Eclipsing : 20 cm

Eclipsing : 50 cm

Eclipsing : 10 cm

Rotation Measure (RM) Faraday rotation of linearly polarized radio sources Pulsars as high linearly polarized sources Position Angle (PA) rotate as it pass through the magnetic intersteller medium Incorrect RM: depolarization

Depolarization Phenomenon 3-min sub-integration Searching for RM and showing polarization profiles. RM: 173.6 rad m-2 found PSR-WD system with depolarization phenomenon

Polarization profiles 10 cm: no linear polarization, because of weak signal and low linear polarization

Polarization properties VS orbital phase

Turbulence of Pulsar wind Depolarization due to turbulence of Faraday Rotation (Burn 1996) Lower frequency, easier depolarized Assume significant depolarization when Orbital Phase [0.7,0.8] < 4 [0.55, 0.7] [0.8,0.9] others

Conclusions Obtain polarization profiles for 3 bands for the eclipsing pulsar PSR J1748-2446A Found no eclipse at 10 cm Found PSR-WD system with depolarization phenomenon Duration of both total eclipse and depolarization depend on frequency Depolarization because of turbulence of Faraday rotation of pulsar wind Help understanding the eclipse mechanism

Timing results: 20 cm

Timing results: 50 cm

Timing results: 10 cm

Timing result Eclipsing duration: 50 cm: 54 mins, 20 cm : 36 mins, 10 cm: 0 20 cm: 400μs, DM, 0.18 cm-3 pc, ne: 8.0e6 cm-3