A pilot ASKAP survey for radio transients towards the Galactic Centre

Ziteng Wang; Tara Murphy; David L. Kaplan; Keith W. Bannister; Emil Lenc; James K. Leung; Andrew O'Brien; Sergio Pintaldi; Joshua Pritchard; Adam J. Stewart; Andrew Zic

doi:10.1093/mnras/stac2542

A pilot ASKAP survey for radio transients towards the Galactic Centre

Ziteng Wang, Tara Murphy, David L. Kaplan, Keith W. Bannister, Emil Lenc, James K. Leung, Andrew O'Brien, Sergio Pintaldi, Joshua Pritchard, Adam J. Stewart, Andrew Zic

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Abstract

We present the results of a radio transient and polarization survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering ∼ 265 deg² (350° ≲ l ≲ 10°, |b| ≲ 10 degrees). Each field was observed for 12 min, with between 7 and 9 repeats on cadences of between one day and four months. We detected eight highly variable sources and seven highly circularly polarized sources (14 unique sources in total). Seven of these sources are known pulsars including the rotating radio transient PSR J1739-2521 and the eclipsing pulsar PSR J1723-2837. One of them is a low-mass X-ray binary, 4U 1758-25. Three of them are coincident with optical or infrared sources and are likely to be stars. The remaining three may be related to the class of Galactic Centre Radio Transients (including a highly likely one, VAST J173608.2-321634, that has been reported previously), although this class is not yet understood. In the coming years, we expect to detect ∼ 40 bursts from this kind of source with the proposed 4-yr VAST survey if the distribution of the source is isotropic over the Galactic fields.

Original language	English
Pages (from-to)	5972-5988
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	516
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stac2542
Publication status	Published - Nov 2022

Bibliographical note

© The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

Galaxy: centre
radio continuum: stars
radio continuum: transients
radio continuum: Transients

Access to Document

10.1093/mnras/stac2542Licence: CC BY

Publisher version (open access)Final published version, 10.1 MBLicence: CC BY

Cite this

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title = "A pilot ASKAP survey for radio transients towards the Galactic Centre",

abstract = "We present the results of a radio transient and polarization survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering ∼ 265 deg2 (350° ≲ l ≲ 10°, |b| ≲ 10 degrees). Each field was observed for 12 min, with between 7 and 9 repeats on cadences of between one day and four months. We detected eight highly variable sources and seven highly circularly polarized sources (14 unique sources in total). Seven of these sources are known pulsars including the rotating radio transient PSR J1739-2521 and the eclipsing pulsar PSR J1723-2837. One of them is a low-mass X-ray binary, 4U 1758-25. Three of them are coincident with optical or infrared sources and are likely to be stars. The remaining three may be related to the class of Galactic Centre Radio Transients (including a highly likely one, VAST J173608.2-321634, that has been reported previously), although this class is not yet understood. In the coming years, we expect to detect ∼ 40 bursts from this kind of source with the proposed 4-yr VAST survey if the distribution of the source is isotropic over the Galactic fields.",

keywords = "Galaxy: centre, radio continuum: stars, radio continuum: transients, radio continuum: Transients",

author = "Ziteng Wang and Tara Murphy and Kaplan, {David L.} and Bannister, {Keith W.} and Emil Lenc and Leung, {James K.} and Andrew O'Brien and Sergio Pintaldi and Joshua Pritchard and Stewart, {Adam J.} and Andrew Zic",

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AU - Wang, Ziteng

AU - Murphy, Tara

AU - Kaplan, David L.

AU - Bannister, Keith W.

AU - Lenc, Emil

AU - Leung, James K.

AU - O'Brien, Andrew

AU - Pintaldi, Sergio

AU - Pritchard, Joshua

AU - Stewart, Adam J.

AU - Zic, Andrew

N1 - © The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2022/11

Y1 - 2022/11

N2 - We present the results of a radio transient and polarization survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering ∼ 265 deg2 (350° ≲ l ≲ 10°, |b| ≲ 10 degrees). Each field was observed for 12 min, with between 7 and 9 repeats on cadences of between one day and four months. We detected eight highly variable sources and seven highly circularly polarized sources (14 unique sources in total). Seven of these sources are known pulsars including the rotating radio transient PSR J1739-2521 and the eclipsing pulsar PSR J1723-2837. One of them is a low-mass X-ray binary, 4U 1758-25. Three of them are coincident with optical or infrared sources and are likely to be stars. The remaining three may be related to the class of Galactic Centre Radio Transients (including a highly likely one, VAST J173608.2-321634, that has been reported previously), although this class is not yet understood. In the coming years, we expect to detect ∼ 40 bursts from this kind of source with the proposed 4-yr VAST survey if the distribution of the source is isotropic over the Galactic fields.

AB - We present the results of a radio transient and polarization survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering ∼ 265 deg2 (350° ≲ l ≲ 10°, |b| ≲ 10 degrees). Each field was observed for 12 min, with between 7 and 9 repeats on cadences of between one day and four months. We detected eight highly variable sources and seven highly circularly polarized sources (14 unique sources in total). Seven of these sources are known pulsars including the rotating radio transient PSR J1739-2521 and the eclipsing pulsar PSR J1723-2837. One of them is a low-mass X-ray binary, 4U 1758-25. Three of them are coincident with optical or infrared sources and are likely to be stars. The remaining three may be related to the class of Galactic Centre Radio Transients (including a highly likely one, VAST J173608.2-321634, that has been reported previously), although this class is not yet understood. In the coming years, we expect to detect ∼ 40 bursts from this kind of source with the proposed 4-yr VAST survey if the distribution of the source is isotropic over the Galactic fields.

KW - Galaxy: centre

KW - radio continuum: stars

KW - radio continuum: transients

KW - radio continuum: Transients

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DO - 10.1093/mnras/stac2542

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VL - 516

SP - 5972

EP - 5988

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

A pilot ASKAP survey for radio transients towards the Galactic Centre

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