The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array
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)...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Institute of Physics Publishing Ltd.
2014
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/4732 |
| _version_ | 1848744598491365376 |
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| author | Bhat, Ramesh Ord, S. Tremblay, Steven Tingay, Steven Deshpande, A. van Straten, W. Oronsaye, S. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Emrich, David Goeke, R. Greenhill, L. Hazelton, B. Hewitt, J. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Rogers, A. Roshi, D. Udaya-Shankar, N. Srivani, K. Subrahmanyan, R. Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, Andrew Williams, C. |
| author_facet | Bhat, Ramesh Ord, S. Tremblay, Steven Tingay, Steven Deshpande, A. van Straten, W. Oronsaye, S. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Emrich, David Goeke, R. Greenhill, L. Hazelton, B. Hewitt, J. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Rogers, A. Roshi, D. Udaya-Shankar, N. Srivani, K. Subrahmanyan, R. Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, Andrew Williams, C. |
| author_sort | Bhat, Ramesh |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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 nano Hertz gravitational waves via the accurate characterization of ISM effects. |
| first_indexed | 2025-11-14T06:04:01Z |
| format | Journal Article |
| id | curtin-20.500.11937-4732 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:04:01Z |
| publishDate | 2014 |
| publisher | Institute of Physics Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-47322023-02-22T06:24:24Z The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array Bhat, Ramesh Ord, S. Tremblay, Steven Tingay, Steven Deshpande, A. van Straten, W. Oronsaye, S. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Emrich, David Goeke, R. Greenhill, L. Hazelton, B. Hewitt, J. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Rogers, A. Roshi, D. Udaya-Shankar, N. Srivani, K. Subrahmanyan, R. Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, Andrew Williams, C. instrumentation: interferometers methods: observational pulsars: general pulsars: individual (PSR J0437-4715) 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 nano Hertz gravitational waves via the accurate characterization of ISM effects. 2014 Journal Article http://hdl.handle.net/20.500.11937/4732 10.1088/2041-8205/791/2/L32 Institute of Physics Publishing Ltd. unknown |
| spellingShingle | instrumentation: interferometers methods: observational pulsars: general pulsars: individual (PSR J0437-4715) Bhat, Ramesh Ord, S. Tremblay, Steven Tingay, Steven Deshpande, A. van Straten, W. Oronsaye, S. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Emrich, David Goeke, R. Greenhill, L. Hazelton, B. Hewitt, J. Johnston-Hollitt, M. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Prabu, T. Rogers, A. Roshi, D. Udaya-Shankar, N. Srivani, K. Subrahmanyan, R. Waterson, Mark Wayth, Randall Webster, R. Whitney, A. Williams, Andrew Williams, C. The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array |
| title | The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array |
| title_full | The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array |
| title_fullStr | The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array |
| title_full_unstemmed | The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array |
| title_short | The low-frequency characteristics of PSR J0437-4715 observed with the Murchison wide-field array |
| title_sort | low-frequency characteristics of psr j0437-4715 observed with the murchison wide-field array |
| topic | instrumentation: interferometers methods: observational pulsars: general pulsars: individual (PSR J0437-4715) |
| url | http://hdl.handle.net/20.500.11937/4732 |