The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array

N. D R Bhat; S. M. Ord; S. E. Tremblay; S. J. Tingay; A. A. Deshpande; W. Van Straten; S. Oronsaye; G. Bernardi; Judd Bowman; F. Briggs; R. J. Cappallo; B. E. Corey; D. Emrich; R. Goeke; L. J. Greenhill; B. J. Hazelton; J. N. Hewitt; M. Johnston-Hollitt; D. L. Kaplan; J. C. Kasper; E. Kratzenberg; C. J. Lonsdale; M. J. Lynch; S. R. McWhirter; D. A. Mitchell; M. F. Morales; E. Morgan; D. Oberoi; T. Prabu; A. E E Rogers; D. A. Roshi; N. Udaya Shankar; K. S. Srivani; R. Subrahmanyan; M. Waterson; R. B. Wayth; R. L. Webster; A. R. Whitney; A. Williams; C. L. Williams

doi:10.1088/2041-8205/791/2/L32

The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array

N. D R Bhat, S. M. Ord, S. E. Tremblay, S. J. Tingay, A. A. Deshpande, W. Van Straten, S. Oronsaye, G. Bernardi, Judd Bowman, F. Briggs, R. J. Cappallo, B. E. Corey, D. Emrich, R. Goeke, L. J. Greenhill, B. J. Hazelton, J. N. Hewitt, M. Johnston-Hollitt, D. L. Kaplan, J. C. KasperE. Kratzenberg, C. J. Lonsdale, M. J. Lynch, S. R. McWhirter, D. A. Mitchell, M. F. Morales, E. Morgan, D. Oberoi, T. Prabu, A. E E Rogers, D. A. Roshi, N. Udaya Shankar, K. S. Srivani, R. Subrahmanyan, M. Waterson, R. B. Wayth, R. L. Webster, A. R. Whitney, A. Williams, C. L. Williams

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

We report on the detection of the millisecond pulsar PSR J0437-4715 with the Murchison Wide-field Array (MWA) at a frequency of 192 MHz. Our observations show rapid modulations of pulse intensity in time and frequency that arise from diffractive scintillation effects in the interstellar medium (ISM), as well as prominent drifts of intensity maxima in the time-frequency plane that arise from refractive effects. Our analysis suggests that the scattering screen is located at a distance of ∼80-120 pc from the Sun, in disagreement with a recent claim that the screen is closer (∼10 pc). Comparisons with higher frequency data from Parkes reveal a dramatic evolution of the pulse profile with frequency, with the outer conal emission becoming comparable in strength to that from the core and inner conal regions. As well as demonstrating the high time resolution science capabilities currently possible with the MWA, our observations underscore the potential to conduct low-frequency investigations of timing-array millisecond pulsars, which may lead to increased sensitivity in the detection of nanoHertz gravitational waves via the accurate characterization of ISM effects.

Original language	English (US)
Article number	L32
Journal	Astrophysical Journal Letters
Volume	791
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/791/2/L32
State	Published - Aug 20 2014

Keywords

instrumentation: interferometers
methods: observational
pulsars: general
pulsars: individual (PSR J0437-4715)

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/2041-8205/791/2/L32

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Bhat, N. D. R., Ord, S. M., Tremblay, S. E., Tingay, S. J., Deshpande, A. A., Van Straten, W., Oronsaye, S., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R. J., Corey, B. E., Emrich, D., Goeke, R., Greenhill, L. J., Hazelton, B. J., Hewitt, J. N., Johnston-Hollitt, M., Kaplan, D. L., ... Williams, C. L. (2014). The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array. Astrophysical Journal Letters, 791(2), Article L32. https://doi.org/10.1088/2041-8205/791/2/L32

Bhat, NDR, Ord, SM, Tremblay, SE, Tingay, SJ, Deshpande, AA, Van Straten, W, Oronsaye, S, Bernardi, G, Bowman, J, Briggs, F, Cappallo, RJ, Corey, BE, Emrich, D, Goeke, R, Greenhill, LJ, Hazelton, BJ, Hewitt, JN, Johnston-Hollitt, M, Kaplan, DL, Kasper, JC, Kratzenberg, E, Lonsdale, CJ, Lynch, MJ, McWhirter, SR, Mitchell, DA, Morales, MF, Morgan, E, Oberoi, D, Prabu, T, Rogers, AEE, Roshi, DA, Udaya Shankar, N, Srivani, KS, Subrahmanyan, R, Waterson, M, Wayth, RB, Webster, RL, Whitney, AR, Williams, A & Williams, CL 2014, 'The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array', Astrophysical Journal Letters, vol. 791, no. 2, L32. https://doi.org/10.1088/2041-8205/791/2/L32

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title = "The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array",

abstract = "We report on the detection of the millisecond pulsar PSR J0437-4715 with the Murchison Wide-field Array (MWA) at a frequency of 192 MHz. Our observations show rapid modulations of pulse intensity in time and frequency that arise from diffractive scintillation effects in the interstellar medium (ISM), as well as prominent drifts of intensity maxima in the time-frequency plane that arise from refractive effects. Our analysis suggests that the scattering screen is located at a distance of ∼80-120 pc from the Sun, in disagreement with a recent claim that the screen is closer (∼10 pc). Comparisons with higher frequency data from Parkes reveal a dramatic evolution of the pulse profile with frequency, with the outer conal emission becoming comparable in strength to that from the core and inner conal regions. As well as demonstrating the high time resolution science capabilities currently possible with the MWA, our observations underscore the potential to conduct low-frequency investigations of timing-array millisecond pulsars, which may lead to increased sensitivity in the detection of nanoHertz gravitational waves via the accurate characterization of ISM effects.",

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author = "Bhat, {N. D R} and Ord, {S. M.} and Tremblay, {S. E.} and Tingay, {S. J.} and Deshpande, {A. A.} and {Van Straten}, W. and S. Oronsaye and G. Bernardi and Judd Bowman and F. Briggs and Cappallo, {R. J.} and Corey, {B. E.} and D. Emrich and R. Goeke and Greenhill, {L. J.} and Hazelton, {B. J.} and Hewitt, {J. N.} and M. Johnston-Hollitt and Kaplan, {D. L.} and Kasper, {J. C.} and E. Kratzenberg and Lonsdale, {C. J.} and Lynch, {M. J.} and McWhirter, {S. R.} and Mitchell, {D. A.} and Morales, {M. F.} and E. Morgan and D. Oberoi and T. Prabu and Rogers, {A. E E} and Roshi, {D. A.} and {Udaya Shankar}, N. and Srivani, {K. S.} and R. Subrahmanyan and M. Waterson and Wayth, {R. B.} and Webster, {R. L.} and Whitney, {A. R.} and A. Williams and Williams, {C. L.}",

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T1 - The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array

AU - Bhat, N. D R

AU - Ord, S. M.

AU - Tremblay, S. E.

AU - Tingay, S. J.

AU - Deshpande, A. A.

AU - Van Straten, W.

AU - Oronsaye, S.

AU - Bernardi, G.

AU - Bowman, Judd

AU - Briggs, F.

AU - Cappallo, R. J.

AU - Corey, B. E.

AU - Emrich, D.

AU - Goeke, R.

AU - Greenhill, L. J.

AU - Hazelton, B. J.

AU - Hewitt, J. N.

AU - Johnston-Hollitt, M.

AU - Kaplan, D. L.

AU - Kasper, J. C.

AU - Kratzenberg, E.

AU - Lonsdale, C. J.

AU - Lynch, M. J.

AU - McWhirter, S. R.

AU - Mitchell, D. A.

AU - Morales, M. F.

AU - Morgan, E.

AU - Oberoi, D.

AU - Prabu, T.

AU - Rogers, A. E E

AU - Roshi, D. A.

AU - Udaya Shankar, N.

AU - Srivani, K. S.

AU - Subrahmanyan, R.

AU - Waterson, M.

AU - Wayth, R. B.

AU - Webster, R. L.

AU - Whitney, A. R.

AU - Williams, A.

AU - Williams, C. L.

PY - 2014/8/20

Y1 - 2014/8/20

N2 - We report on the detection of the millisecond pulsar PSR J0437-4715 with the Murchison Wide-field Array (MWA) at a frequency of 192 MHz. Our observations show rapid modulations of pulse intensity in time and frequency that arise from diffractive scintillation effects in the interstellar medium (ISM), as well as prominent drifts of intensity maxima in the time-frequency plane that arise from refractive effects. Our analysis suggests that the scattering screen is located at a distance of ∼80-120 pc from the Sun, in disagreement with a recent claim that the screen is closer (∼10 pc). Comparisons with higher frequency data from Parkes reveal a dramatic evolution of the pulse profile with frequency, with the outer conal emission becoming comparable in strength to that from the core and inner conal regions. As well as demonstrating the high time resolution science capabilities currently possible with the MWA, our observations underscore the potential to conduct low-frequency investigations of timing-array millisecond pulsars, which may lead to increased sensitivity in the detection of nanoHertz gravitational waves via the accurate characterization of ISM effects.

AB - We report on the detection of the millisecond pulsar PSR J0437-4715 with the Murchison Wide-field Array (MWA) at a frequency of 192 MHz. Our observations show rapid modulations of pulse intensity in time and frequency that arise from diffractive scintillation effects in the interstellar medium (ISM), as well as prominent drifts of intensity maxima in the time-frequency plane that arise from refractive effects. Our analysis suggests that the scattering screen is located at a distance of ∼80-120 pc from the Sun, in disagreement with a recent claim that the screen is closer (∼10 pc). Comparisons with higher frequency data from Parkes reveal a dramatic evolution of the pulse profile with frequency, with the outer conal emission becoming comparable in strength to that from the core and inner conal regions. As well as demonstrating the high time resolution science capabilities currently possible with the MWA, our observations underscore the potential to conduct low-frequency investigations of timing-array millisecond pulsars, which may lead to increased sensitivity in the detection of nanoHertz gravitational waves via the accurate characterization of ISM effects.

KW - instrumentation: interferometers

KW - methods: observational

KW - pulsars: general

KW - pulsars: individual (PSR J0437-4715)

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SN - 2041-8205

VL - 791

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

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M1 - L32

ER -

The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array

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Keywords

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