Discovery of a Steep-spectrum Low-luminosity Pulsar with the Murchison Widefield Array
Swainston,N. A.1; Bhat,N. D. R.1; Sokolowski,M.1; McSweeney,S. J.1; Kudale,S.2; Dai,S.3,4; Smith,K. R.1; Morrison,I. S.1; Shannon,R. M.5,6; van Straten,W.7; Xue,M.8; Ord,S. M.3; Tremblay,S. E.1; Meyers,B. W.9; Williams,A.1; Sleap,G.1; Johnston-Hollitt,M.1; Kaplan,D. L.10; Tingay,S. J.1; Wayth,R. B.1
Source PublicationThe Astrophysical Journal Letters
AbstractAbstract We report the discovery of the first new pulsar with the Murchison Widefield Array (MWA), PSR J0036?1033, a long-period (0.9 s) nonrecycled pulsar with a dispersion measure (DM) of 23.1 pc cm?3. It was found after processing only a small fraction (~1%) of data from an ongoing all-sky pulsar survey. Follow-up observations have been made with the MWA, the upgraded Giant Metrewave Radio Telescope (uGMRT), and the Parkes 64 m telescopes, spanning a frequency range from ~150 MHz to 4 GHz. The pulsar is faint, with an estimated flux density (S) of ~1 mJy at 400 MHz and a spectrum , where ν is frequency. The DM-derived distance implies that it is also a low-luminosity source (~0.1 mJy kpc2 at 1400 MHz). The analysis of archival MWA observations reveals that the pulsar’s mean flux density varies by up to a factor of ~5–6 on timescales of several weeks to months. By combining MWA and uGMRT data, the pulsar position was determined to arcsecond precision. We also report on polarization properties detected in the MWA and Parkes bands. The pulsar’s nondetection in previous pulsar and continuum imaging surveys, the observed high variability, and its detection in a small fraction of the survey data searched to date, all hint at a larger population of pulsars that await discovery in the southern hemisphere, with the MWA and the future low-frequency Square Kilometre Array.
KeywordRadio pulsars Radio astronomy
WOS IDIOP:2041-8205-911-2-abec7b
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorBhat,N. D. R.
Affiliation1.International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia;
2.National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411 007, India
3.CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia
4.Western Sydney University, Locked Bag 1797, Penrith South DC, NSW 1797, Australia
5.Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia
6.ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Swinburne University of Technology, Hawthorn, Australia
7.Institute for Radio Astronomy & Space Research, Auckland University of Technology, Private Bag 92006, Auckland 1142, New Zealand
8.National Astronomical Observatories, Chinese Academy of Sciences, Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China
9.Department of Physics & Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada
10.Department of Physics, University of Wisconsin–Milwaukee, Milwaukee, WI 53201, USA
Recommended Citation
GB/T 7714
Swainston,N. A.,Bhat,N. D. R.,Sokolowski,M.,et al. Discovery of a Steep-spectrum Low-luminosity Pulsar with the Murchison Widefield Array[J]. The Astrophysical Journal Letters,2021,911(2).
APA Swainston,N. A..,Bhat,N. D. R..,Sokolowski,M..,McSweeney,S. J..,Kudale,S..,...&Wayth,R. B..(2021).Discovery of a Steep-spectrum Low-luminosity Pulsar with the Murchison Widefield Array.The Astrophysical Journal Letters,911(2).
MLA Swainston,N. A.,et al."Discovery of a Steep-spectrum Low-luminosity Pulsar with the Murchison Widefield Array".The Astrophysical Journal Letters 911.2(2021).
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