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Observations of Low...
Observations of Low-frequency Radio Emission from Millisecond Pulsars and Multipath Propagation in the Interstellar Medium
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- Bhat, N. D. R. (author)
- ARC Centre of Excellence for All-sky Astrophysics (CAASTRO),Curtin University
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- Tremblay, S. E. (author)
- Curtin University,ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)
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- Kirsten, Franz, 1983 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Meyers, B. W. (author)
- Commonwealth Scientific and Industrial Research Organisation (CSIRO),ARC Centre of Excellence for All-sky Astrophysics (CAASTRO),Curtin University
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- Sokolowski, M. (author)
- Curtin University,ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)
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- van Straten, W. (author)
- Auckland University of Technology
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- McSweeney, S. J. (author)
- Curtin University,ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)
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- Ord, S. M. (author)
- Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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- Shannon, R. M. (author)
- ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav),Curtin University,Swinburne University of Technology,Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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- Beardsley, A. (author)
- Arizona State University
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- Crosse, B. (author)
- Curtin University
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- Emrich, D. (author)
- Curtin University
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- Franzen, T. M. O. (author)
- Curtin University
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- Horsley, L. (author)
- Curtin University
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- Johnston-Hollitt, M. (author)
- Curtin University
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- Kaplan, D. L. (author)
- University of Wisconsin Madison
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- Kenney, D. (author)
- Curtin University
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- Morales, M. F. (author)
- University of Washington
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- Pallot, D. (author)
- University of Western Australia
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- Steele, K. (author)
- Curtin University
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- Tingay, S. J. (author)
- ARC Centre of Excellence for All-sky Astrophysics (CAASTRO),Curtin University
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- Trott, C. M. (author)
- ARC Centre of Excellence for All-sky Astrophysics (CAASTRO),Curtin University
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- Walker, M. (author)
- Curtin University
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- Wayth, R. B. (author)
- ARC Centre of Excellence for All-sky Astrophysics (CAASTRO),Curtin University
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- Williams, A. (author)
- Curtin University
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- Wu, C. (author)
- University of Western Australia
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(creator_code:org_t)
- 2018-08-23
- 2018
- English.
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In: Astrophysical Journal, Supplement Series. - : American Astronomical Society. - 1538-4365 .- 0067-0049. ; 238:1
- Related links:
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http://arxiv.org/pdf...
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https://doi.org/10.3...
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Abstract
Subject headings
Close
- Studying the gravitational-wave sky with pulsar timing arrays (PTAs) is a key science goal for the Square Kilometre Array (SKA) and its pathfinder telescopes. With current PTAs reaching sub-microsecond timing precision, making accurate measurements of interstellar propagation effects and mitigating them effectively has become increasingly important to realize PTA goals. As these effects are much stronger at longer wavelengths, low-frequency observations are most appealing for characterizing the interstellar medium (ISM) along the sight lines toward PTA pulsars. The Murchison Widefield Array (MWA) and the Engineering Development Array (EDA), which utilizes MWA technologies, present promising opportunities for undertaking such studies, particularly for PTA pulsars located in the southern sky. Such pulsars are also the prime targets for PTA efforts planned with the South African MeerKAT, and eventually with the SKA. In this paper we report on observations of two bright southern millisecond pulsars, PSR J0437-4715 and PSR J2145-0750, made with these facilities; MWA observations sampled multiple frequencies across the 80-250 MHz frequency range, while the EDA provided direct-sampled baseband data to yield a large instantaneous usable bandwidth of similar to 200 MHz. Using these exploratory observations, we investigate various aspects relating to pulsar emission and ISM properties, such as spectral evolution of the mean pulse shape, scintillation as a function of frequency, chromaticity in interstellar dispersion, and flux density spectra at low frequencies. Systematic and regular monitoring observations will help ascertain the role of low-frequency measurements in PTA experiments, while simultaneously providing a detailed characterization of the ISM toward the pulsars, which will be useful in devising optimal observing strategies for future PTA experiments.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Medicinsk laboratorie- och mätteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Medical Laboratory and Measurements Technologies (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- instrumentation: interferometers
- ISM: general
- pulsars: general
- methods: observational
- pulsars: individual (PSR J0437-4715, PSR J2145-0750)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Bhat, N. D. R.
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Tremblay, S. E.
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Kirsten, Franz, ...
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Meyers, B. W.
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Sokolowski, M.
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van Straten, W.
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show more...
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McSweeney, S. J.
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Ord, S. M.
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Shannon, R. M.
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Beardsley, A.
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Crosse, B.
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Emrich, D.
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Franzen, T. M. O ...
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Horsley, L.
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Johnston-Hollitt ...
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Kaplan, D. L.
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Kenney, D.
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Morales, M. F.
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Pallot, D.
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Steele, K.
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Tingay, S. J.
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Trott, C. M.
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Walker, M.
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Wayth, R. B.
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Williams, A.
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Wu, C.
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show less...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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NATURAL SCIENCES
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Chalmers University of Technology