Square Kilometre Array

Author(s):  
Jeff Wagg ◽  
Izaskun Jimenez-Serra ◽  
Tyler Bourke ◽  
Robert Braun ◽  
Phil Diamond ◽  
...  
2021 ◽  
Vol 502 (4) ◽  
pp. 5438-5454
Author(s):  
Joshua Pritchard ◽  
Tara Murphy ◽  
Andrew Zic ◽  
Christene Lynch ◽  
George Heald ◽  
...  

ABSTRACT We present results from a circular polarization survey for radio stars in the Rapid ASKAP Continuum Survey (RACS). RACS is a survey of the entire sky south of δ = +41○ being conducted with the Australian Square Kilometre Array Pathfinder telescope (ASKAP) over a 288 MHz wide band centred on 887.5 MHz. The data we analyse include Stokes I and V polarization products to an RMS sensitivity of 250 μJy PSF−1. We searched RACS for sources with fractional circular polarization above 6 per cent, and after excluding imaging artefacts, polarization leakage, and known pulsars we identified radio emission coincident with 33 known stars. These range from M-dwarfs through to magnetic, chemically peculiar A- and B-type stars. Some of these are well-known radio stars such as YZ CMi and CU Vir, but 23 have no previous radio detections. We report the flux density and derived brightness temperature of these detections and discuss the nature of the radio emission. We also discuss the implications of our results for the population statistics of radio stars in the context of future ASKAP and Square Kilometre Array surveys.


Author(s):  
Ray P. Norris ◽  
Huib T. Intema ◽  
Anna D. Kapińska ◽  
Bärbel S. Koribalski ◽  
Emil Lenc ◽  
...  

Abstract We have found a class of circular radio objects in the Evolutionary Map of the Universe Pilot Survey, using the Australian Square Kilometre Array Pathfinder telescope. The objects appear in radio images as circular edge-brightened discs, about one arcmin diameter, that are unlike other objects previously reported in the literature. We explore several possible mechanisms that might cause these objects, but none seems to be a compelling explanation.


2015 ◽  
Vol 453 (2) ◽  
pp. 1249-1267 ◽  
Author(s):  
J. R. Allison ◽  
E. M. Sadler ◽  
V. A. Moss ◽  
M. T. Whiting ◽  
R. W. Hunstead ◽  
...  

2017 ◽  
Vol 13 (S337) ◽  
pp. 158-164 ◽  
Author(s):  
Evan F. Keane

AbstractThe Square Kilometre Array (SKA) will be sensitive enough to discover all of the pulsars in the Milky Way that are beamed towards Earth. Already in the initial deployment, SKA Phase 1, it will make significant advances in pulsar science. In these proceedings I briefly overview what the SKA is, and describe its pulsar search and timing capabilities.


2014 ◽  
Vol 2 (12) ◽  
pp. 1040-1045 ◽  
Author(s):  
Proven-Adzri Emmanuel ◽  
Nana Klutse ◽  
Dickson Adomako ◽  
Prosper Ashilevi ◽  
Eric Aggrey

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