Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The low-frequency characteristics of PSR J0437-4715 observed with the murchison wide-field Array
Astrophysical Journal Letters, Volume 791, No. 2, Article L32, Year 2014
Notification
URL copied to clipboard!
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 nanoHertz gravitational waves via the accurate characterization of ISM effects. © 2014. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Bhat, N. D. R.
Australia, Perth
Curtin University
Ord, Stephen M.
Australia, Perth
Curtin University
Tremblay, Steven E.
Australia, Perth
Curtin University
Tingay, Steven John
Australia, Perth
Curtin University
Deshpande, Avinash A.
India, Bengaluru
Raman Research Institute
Van Straten, Willem V.
Australia, Perth
Curtin University
Australia, Hawthorn
Swinburne University of Technology
Oronsaye, S. I.
Australia, Perth
Curtin University
Bernardi, Gianni
South Africa, Pinelands
Square Kilometre Array, South Africa
South Africa, Grahamstown
Rhodes University
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Bowman, Judd D.
United States, Tempe
School of Earth and Space Exploration
Briggs, Franklin H.
Australia, Perth
Curtin University
Australia, Canberra
The Australian National University
Cappallo, Roger J.
United States, Westford
Mit Haystack Observatory
Corey, Brian E.
United States, Westford
Mit Haystack Observatory
Emrich, David
Australia, Perth
Curtin University
Goeke, Robert F.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Greenhill, Lincoln J.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Hazelton, Bryna J.
United States, Seattle
University of Washington
Hewitt, Jacqueline N.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Johnston-Hollitt, Melanie
New Zealand, Wellington
Victoria University of Wellington
Kaplan, David L.A.
United States, Milwaukee
University of Wisconsin-milwaukee
Kasper, Justin C.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
United States, Ann Arbor
University of Michigan, Ann Arbor
Kratzenberg, Eric
United States, Westford
Mit Haystack Observatory
Lonsdale, Colin J.
United States, Westford
Mit Haystack Observatory
Lynch, Mervyn J.
Australia, Perth
Curtin University
McWhirter, Stephen Russell
United States, Westford
Mit Haystack Observatory
Mitchell, Daniel A.
Australia, Perth
Curtin University
Australia
Csiro Astronomy and Space Science
Morales, Miguel F.
United States, Seattle
University of Washington
Morgan, Edward H.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Oberoi, Divya
India, Pune
National Centre for Radio Astrophysics India
Prabu, Thiagaraj
India, Bengaluru
Raman Research Institute
Rogers, Alan E.E.
United States, Westford
Mit Haystack Observatory
Roshi, D. Anish
United States, Charlottesville
National Radio Astronomy Observatory
Udaya-Shankar, N.
India, Bengaluru
Raman Research Institute
Srivani, K. S.
India, Bengaluru
Raman Research Institute
Subrahmanyan, Ravi
Australia, Perth
Curtin University
India, Bengaluru
Raman Research Institute
Waterson, Mark F.
Australia, Perth
Curtin University
Australia, Canberra
The Australian National University
Wayth, Randall B.
Australia, Perth
Curtin University
Webster, Rachel L.
Australia, Perth
Curtin University
Australia, Melbourne
University of Melbourne
Whitney, Alan R.
United States, Westford
Mit Haystack Observatory
Williams, Andrew J.
Australia, Perth
Curtin University
Williams, Christopherl L.M.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Statistics
Citations: 40
Authors: 40
Affiliations: 18
Identifiers
Doi:
10.1088/2041-8205/791/2/L32
ISSN:
20418205
e-ISSN:
20418213
Research Areas
Environmental