A pilot ASKAP survey for radio transients towards the Galactic Centre

Abstract

We present the results of a radio transient and polarisation 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 $\sim 265{\mathrm{deg}}^2$ ($350^{\circ }\lesssim l\lesssim 10^{\circ }$, $|b|\lesssim 10^{\circ }$). Each field was observed for 12\,minutes, 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-polarised 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 $\sim$40 bursts from this kind of source with the proposed four-year VAST survey if the distribution of the source is isotropic over the Galactic fields.

arXiv comment17 pages, 13 figures, Accepted for publication in MNRAS

References in corpus (57)

• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• The ATNF Pulsar Catalogue
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images
• Transient radio bursts from rotating neutron stars
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• Gaia Data Release 2: first stellar parameters from Apsis
• Gaia Early Data Release 3 -- Catalogue validation
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• SkyMapper Southern Survey: First Data Release (DR1)
• Empirical extinction coefficients for the GALEX, SDSS, 2MASS and WISE passbands
• GLEAM: The GaLactic and Extragalactic All-sky MWA survey
• Australian Square Kilometre Array Pathfinder: I. System Description
• The Rapid ASKAP Continuum Survey I: Design and First Results
• The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
• SkyMapper Southern Survey: Second Data Release (DR2)
• The Rapid ASKAP Continuum Survey Paper II: First Stokes I Source Catalogue Data Release
• A powerful bursting radio source towards the Galactic Centre
• Polarimetry of 600 pulsars from observations at 1.4 GHz with the Parkes radio telescope
• The Caltech-NRAO Stripe 82 Survey (CNSS) Paper I: The Pilot Radio Transient Survey In 50 deg${}^2$
• VAST: An ASKAP Survey for Variables and Slow Transients
• The population of M dwarfs observed at low radio frequencies
• An all-sky survey of circular polarisation at 200 MHz
• Source-finding for the Australian Square Kilometre Array Pathfinder
• A 22-year Southern Sky Survey for Transient and Variable Radio Sources using the Molonglo Observatory Synthesis Telescope
• Variable and Transient Radio Sources in the FIRST Survey
• PSR J1723-2837: An Eclipsing Binary Radio Millisecond Pulsar
• Caltech-NRAO Stripe 82 Survey (CNSS). III: The First Radio-discovered Tidal Disruption Event, CNSS J0019+00
• An ASKAP search for a radio counterpart to the first high-significance neutron star-black hole merger LIGO/Virgo S190814bv
• Properties and Evolution of the Redback Millisecond Pulsar Binary PSR J2129-0429
• Exploring the Transient Radio Sky with VLITE: Early Results
• A circular polarisation survey for radio stars with the Australian SKA Pathfinder
• The Low-Frequency Radio Eclipses of the Black Widow Pulsar J1810+1744
• GCRT J1742-3001: A New Radio Transient Towards the Galactic Center
• 154 MHz detection of faint, polarized flares from UV Ceti
• Large-amplitude variables in Gaia Data Release 2. Multi-band variability characterization
• Timing Solution and Single-pulse Properties for Eight Rotating Radio Transients
• Low-Frequency Radio Transients in the Galactic Center
• Direct radio discovery of a cold brown dwarf
• A Search for Radio Transients in VLA Archival Images of the 3C 286 Field
• A decade of radio imaging the relativistic outflow in the peculiar X-ray binary Circinus X-1
• Coherent radio emission from a population of RS Canum Venaticorum systems
• A Faint, Steep Spectum Burst from the Radio Transient GCRT J1745-3009
• Discovery of ASKAP J173608.2-321635 as a Highly-Polarized Transient Point Source with the Australian SKA Pathfinder
• A New Radio Detection of the Bursting Source GCRT J1745-3009
• A Search for the Near-Infrared Counterpart to GCRT J1745-3009
• A population of compact radio variables and transients in the radio bright zone at the Galactic center observed with the Jansky Very Large Array
• Discovery of PSR J0523-7125 as a Circularly Polarized Variable Radio Source in the Large Magellanic Cloud
• Circularly polarized emission from the transient bursting radio source GCRT J1745-3009
• Serendipitous Discovery of PSR J1431-6328 as a Highly-Polarized Point Source with the Australian SKA Pathfinder
• Two Extreme Steep-Spectrum, Polarized Radio Sources Towards the Galactic Bulge
• Transient Events in Archival Very Large Array Observations of the Galactic Center

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• Finding radio transients with anomaly detection and active learning based on volunteer classifications
• Searching for Radio Transients with Inverted Spectra in Epoch 1 of VLASS and VCSS, and Identification of a Sample of Candidate Relativistic Nuclear Transients