The Low-frequency Characteristics of PSR J0437-4715 Observed with the Murchison Wide-field Array
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Bhat, N.D.R.; Ord, S M; Tremblay, S.E.; Tingay, S. J.; Deshpande, Avinash; Van Straten, William; Oronsaye, S. I.; Bernardi, Gianni; Bowman, J D; Briggs, Franklin; Cappallo, R. J; Waterson, Mark
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...[Show more]
dc.contributor.author | Bhat, N.D.R. | |
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dc.contributor.author | Ord, S M | |
dc.contributor.author | Tremblay, S.E. | |
dc.contributor.author | Tingay, S. J. | |
dc.contributor.author | Deshpande, Avinash | |
dc.contributor.author | Van Straten, William | |
dc.contributor.author | Oronsaye, S. I. | |
dc.contributor.author | Bernardi, Gianni | |
dc.contributor.author | Bowman, J D | |
dc.contributor.author | Briggs, Franklin | |
dc.contributor.author | Cappallo, R. J | |
dc.contributor.author | Waterson, Mark | |
dc.date.accessioned | 2020-06-10T00:17:01Z | |
dc.date.available | 2020-06-10T00:17:01Z | |
dc.identifier.issn | 1538-4357 | |
dc.identifier.uri | http://hdl.handle.net/1885/204901 | |
dc.description.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. | |
dc.description.sponsorship | N.D.R.B. is supported by a Curtin Research Fellowship. We thank Matthew Bailes and Bryan Gaensler for useful comments, and Dick Manchester and Lawrence Toomey for help with access to the 430 MHz archival data. Support for the MWA comes from the U.S. National Science Foundation (grants AST-0457585, PHY-0835713, CAREER-0847753, and AST-0908884), the Australian Research Council (LIEF grants LE0775621 and LE0882938), the U.S. Air Force Office of Scientific Research (grant FA9550-0510247), and the Centre for All-sky Astrophysics (an ARC Centre of Excellence funded by grant CE110001020). Support is also provided by the Smithsonian Astrophysical Observatory, the MIT School of Science, the Raman Research Institute, the Australian National University, and the Victoria University of Wellington (via grant MEDE1799 from the New Zealand Ministry of Economic Development and an IBM Shared University Research Grant). The Australian Federal government provides additional support via CSIRO, National Collaborative Research Infrastructure Strategy, Education Investment Fund, and the Australia India Strategic Research Fund, and Astronomy Australia Limited, under contract to Curtin University. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Institute of Physics Publishing | |
dc.rights | © 2014. The American Astronomical Society | |
dc.source | Astrophysical Journal, The | |
dc.title | The Low-frequency Characteristics of PSR J0437-4715 Observed with the Murchison Wide-field Array | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 791 | |
dc.date.issued | 2014 | |
local.identifier.absfor | 020110 - Stellar Astronomy and Planetary Systems | |
local.identifier.ariespublication | u5227626xPUB3 | |
local.publisher.url | http://iopscience.iop.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Bhat, N.D.R., Curtin University | |
local.contributor.affiliation | Ord, S M, Curtin University | |
local.contributor.affiliation | Tremblay, S.E., Curtin University | |
local.contributor.affiliation | Tingay, S. J., Curtin University | |
local.contributor.affiliation | Deshpande, Avinash, Raman Research Institute | |
local.contributor.affiliation | Van Straten, William, Swinburne University of Technology | |
local.contributor.affiliation | Oronsaye, S. I., Curtin University | |
local.contributor.affiliation | Bernardi, Gianni, SKA SA | |
local.contributor.affiliation | Bowman, J D, Arizona State University | |
local.contributor.affiliation | Briggs, Franklin, College of Science, ANU | |
local.contributor.affiliation | Cappallo, R. J, MIT | |
local.contributor.affiliation | Waterson, Mark, College of Science, ANU | |
dc.relation | http://purl.org/au-research/grants/arc/LE0775621 | |
dc.relation | http://purl.org/au-research/grants/arc/LE0882938 | |
dc.relation | http://purl.org/au-research/grants/arc/CE1101020 | |
local.bibliographicCitation.issue | 2 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 6 | |
local.identifier.doi | 10.1088/2041-8205/791/2/L32 | |
dc.date.updated | 2019-12-19T07:37:51Z | |
local.identifier.scopusID | 2-s2.0-84905756884 | |
local.identifier.thomsonID | 000341306200014 | |
dcterms.accessRights | Open Access | |
dc.provenance | http://sherpa.ac.uk/romeo/issn/0004-637X/..."author can archive publisher's version/PDF" from Sherpa/Romeo (as at 10/06/2020) | |
Collections | ANU Research Publications |
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