A High Time-resolution Study of the Millisecond Pulsar J2241-5236 at Frequencies below 300 MHz

D. Kaur, N. D.R. Bhat, S. E. Tremblay, R. M. Shannon, S. J. McSweeney, S. M. Ord, A. P. Beardsley, B. Crosse, D. Emrich, T. M.O. Franzen, L. Horsley, M. Johnston-Hollitt, D. L. Kaplan, D. Kenney, M. F. Morales, D. Pallot, K. Steele, S. J. Tingay, C. M. Trott, M. Walker & 3 others R. B. Wayth, A. Williams, C. Wu

Research output: Contribution to journalArticle

Abstract

One of the major challenges for pulsar timing array (PTA) experiments is the mitigation of the effects of the turbulent interstellar medium (ISM) from timing data. These can potentially lead to measurable delays and/or distortions in the pulse profiles and scale strongly with the inverse of the radio frequency. Low-frequency observations are therefore highly appealing for characterizing them. However, in order to achieve the necessary time resolution to resolve profile features of short-period millisecond pulsars, phase-coherent dedispersion is essential, especially at frequencies below 300 MHz. We present the lowest-frequency (80-220 MHz), coherently dedispersed detections of one of the most promising pulsars for current and future PTAs, PSR J2241-5236, using our new beamformer software for the MWA's voltage capture system, which reconstructs the time series at a much higher time resolution of ∼1 μs by resynthesizing the recorded voltage data at 10 kHz/100 μs native resolutions. Our data reveal a dual-precursor type feature in the pulse profile that is either faint or absent in high-frequency observations from Parkes. The resultant high-fidelity detections have enabled dispersion measure determinations with very high precision, of the order of (2-6) × 10-6 , owing to the microsecond level timing achievable for this pulsar at the MWA's low frequencies. This underscores the usefulness of low-frequency observations for probing the ISM toward PTA pulsars and informing optimal observing strategies for PTA experiments.

Original languageEnglish
Article number133
JournalAstrophysical Journal
Volume882
Issue number2
DOIs
Publication statusPublished - 10 Sep 2019

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Kaur, D., Bhat, N. D. R., Tremblay, S. E., Shannon, R. M., McSweeney, S. J., Ord, S. M., ... Wu, C. (2019). A High Time-resolution Study of the Millisecond Pulsar J2241-5236 at Frequencies below 300 MHz. Astrophysical Journal, 882(2), [133]. https://doi.org/10.3847/1538-4357/ab338f
Kaur, D. ; Bhat, N. D.R. ; Tremblay, S. E. ; Shannon, R. M. ; McSweeney, S. J. ; Ord, S. M. ; Beardsley, A. P. ; Crosse, B. ; Emrich, D. ; Franzen, T. M.O. ; Horsley, L. ; Johnston-Hollitt, M. ; Kaplan, D. L. ; Kenney, D. ; Morales, M. F. ; Pallot, D. ; Steele, K. ; Tingay, S. J. ; Trott, C. M. ; Walker, M. ; Wayth, R. B. ; Williams, A. ; Wu, C. / A High Time-resolution Study of the Millisecond Pulsar J2241-5236 at Frequencies below 300 MHz. In: Astrophysical Journal. 2019 ; Vol. 882, No. 2.
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abstract = "One of the major challenges for pulsar timing array (PTA) experiments is the mitigation of the effects of the turbulent interstellar medium (ISM) from timing data. These can potentially lead to measurable delays and/or distortions in the pulse profiles and scale strongly with the inverse of the radio frequency. Low-frequency observations are therefore highly appealing for characterizing them. However, in order to achieve the necessary time resolution to resolve profile features of short-period millisecond pulsars, phase-coherent dedispersion is essential, especially at frequencies below 300 MHz. We present the lowest-frequency (80-220 MHz), coherently dedispersed detections of one of the most promising pulsars for current and future PTAs, PSR J2241-5236, using our new beamformer software for the MWA's voltage capture system, which reconstructs the time series at a much higher time resolution of ∼1 μs by resynthesizing the recorded voltage data at 10 kHz/100 μs native resolutions. Our data reveal a dual-precursor type feature in the pulse profile that is either faint or absent in high-frequency observations from Parkes. The resultant high-fidelity detections have enabled dispersion measure determinations with very high precision, of the order of (2-6) × 10-6 , owing to the microsecond level timing achievable for this pulsar at the MWA's low frequencies. This underscores the usefulness of low-frequency observations for probing the ISM toward PTA pulsars and informing optimal observing strategies for PTA experiments.",
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Kaur, D, Bhat, NDR, Tremblay, SE, Shannon, RM, McSweeney, SJ, Ord, SM, Beardsley, AP, Crosse, B, Emrich, D, Franzen, TMO, Horsley, L, Johnston-Hollitt, M, Kaplan, DL, Kenney, D, Morales, MF, Pallot, D, Steele, K, Tingay, SJ, Trott, CM, Walker, M, Wayth, RB, Williams, A & Wu, C 2019, 'A High Time-resolution Study of the Millisecond Pulsar J2241-5236 at Frequencies below 300 MHz' Astrophysical Journal, vol. 882, no. 2, 133. https://doi.org/10.3847/1538-4357/ab338f

A High Time-resolution Study of the Millisecond Pulsar J2241-5236 at Frequencies below 300 MHz. / Kaur, D.; Bhat, N. D.R.; Tremblay, S. E.; Shannon, R. M.; McSweeney, S. J.; Ord, S. M.; Beardsley, A. P.; Crosse, B.; Emrich, D.; Franzen, T. M.O.; Horsley, L.; Johnston-Hollitt, M.; Kaplan, D. L.; Kenney, D.; Morales, M. F.; Pallot, D.; Steele, K.; Tingay, S. J.; Trott, C. M.; Walker, M.; Wayth, R. B.; Williams, A.; Wu, C.

In: Astrophysical Journal, Vol. 882, No. 2, 133, 10.09.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A High Time-resolution Study of the Millisecond Pulsar J2241-5236 at Frequencies below 300 MHz

AU - Kaur, D.

AU - Bhat, N. D.R.

AU - Tremblay, S. E.

AU - Shannon, R. M.

AU - McSweeney, S. J.

AU - Ord, S. M.

AU - Beardsley, A. P.

AU - Crosse, B.

AU - Emrich, D.

AU - Franzen, T. M.O.

AU - Horsley, L.

AU - Johnston-Hollitt, M.

AU - Kaplan, D. L.

AU - Kenney, D.

AU - Morales, M. F.

AU - Pallot, D.

AU - Steele, K.

AU - Tingay, S. J.

AU - Trott, C. M.

AU - Walker, M.

AU - Wayth, R. B.

AU - Williams, A.

AU - Wu, C.

PY - 2019/9/10

Y1 - 2019/9/10

N2 - One of the major challenges for pulsar timing array (PTA) experiments is the mitigation of the effects of the turbulent interstellar medium (ISM) from timing data. These can potentially lead to measurable delays and/or distortions in the pulse profiles and scale strongly with the inverse of the radio frequency. Low-frequency observations are therefore highly appealing for characterizing them. However, in order to achieve the necessary time resolution to resolve profile features of short-period millisecond pulsars, phase-coherent dedispersion is essential, especially at frequencies below 300 MHz. We present the lowest-frequency (80-220 MHz), coherently dedispersed detections of one of the most promising pulsars for current and future PTAs, PSR J2241-5236, using our new beamformer software for the MWA's voltage capture system, which reconstructs the time series at a much higher time resolution of ∼1 μs by resynthesizing the recorded voltage data at 10 kHz/100 μs native resolutions. Our data reveal a dual-precursor type feature in the pulse profile that is either faint or absent in high-frequency observations from Parkes. The resultant high-fidelity detections have enabled dispersion measure determinations with very high precision, of the order of (2-6) × 10-6 , owing to the microsecond level timing achievable for this pulsar at the MWA's low frequencies. This underscores the usefulness of low-frequency observations for probing the ISM toward PTA pulsars and informing optimal observing strategies for PTA experiments.

AB - One of the major challenges for pulsar timing array (PTA) experiments is the mitigation of the effects of the turbulent interstellar medium (ISM) from timing data. These can potentially lead to measurable delays and/or distortions in the pulse profiles and scale strongly with the inverse of the radio frequency. Low-frequency observations are therefore highly appealing for characterizing them. However, in order to achieve the necessary time resolution to resolve profile features of short-period millisecond pulsars, phase-coherent dedispersion is essential, especially at frequencies below 300 MHz. We present the lowest-frequency (80-220 MHz), coherently dedispersed detections of one of the most promising pulsars for current and future PTAs, PSR J2241-5236, using our new beamformer software for the MWA's voltage capture system, which reconstructs the time series at a much higher time resolution of ∼1 μs by resynthesizing the recorded voltage data at 10 kHz/100 μs native resolutions. Our data reveal a dual-precursor type feature in the pulse profile that is either faint or absent in high-frequency observations from Parkes. The resultant high-fidelity detections have enabled dispersion measure determinations with very high precision, of the order of (2-6) × 10-6 , owing to the microsecond level timing achievable for this pulsar at the MWA's low frequencies. This underscores the usefulness of low-frequency observations for probing the ISM toward PTA pulsars and informing optimal observing strategies for PTA experiments.

KW - Instrumentation: Interferometers-ism: General-pulsars: General-pulsars: Individual (psr j2241-5236)

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U2 - 10.3847/1538-4357/ab338f

DO - 10.3847/1538-4357/ab338f

M3 - Article

VL - 882

JO - The Astrophysical Journal

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SN - 0004-637X

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