Polarization Properties of an Eclipsing Pulsar Xiaopeng YOU

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

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

Outline • • Introduction of J 1748 -2446 A Observation and Data processing Results

Outline • • Introduction of J 1748 -2446 A Observation and Data processing Results and discussion Conclusions

Basic properties of J 1748 -2446 A • Discovered in 1990, Parkes telescope, 20

Basic properties of J 1748 -2446 A • 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

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 20 cm • 2 observations at 10/50 cm. • Almost all observations cover whole orbital phase.

Eclipsing : 20 cm

Eclipsing : 20 cm

Eclipsing : 50 cm

Eclipsing : 50 cm

Eclipsing : 10 cm

Eclipsing : 10 cm

Rotation Measure (RM) • Faraday rotation of linearly polarized radio sources • Pulsars as

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.

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

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

Polarization properties VS orbital phase

Polarization properties VS orbital phase

Turbulence of Pulsar wind • Depolarization due to turbulence of Faraday Rotation (Burn 1996)

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] [0. 55, 0. 7] [0. 8, 0. 9] others <4

Conclusions • Obtain polarization profiles for 3 bands for the eclipsing pulsar PSR J

Conclusions • Obtain polarization profiles for 3 bands for the eclipsing pulsar PSR J 1748 -2446 A • 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: 20 cm

Timing results: 50 cm

Timing results: 50 cm

Timing results: 10 cm

Timing results: 10 cm

Timing result • Eclipsing duration: 50 cm: 54 mins, 20 cm : 36 mins,

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. 0 e 6 cm-3

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