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26th of October 2023
Characterizing Pulsars Detected in the Rapid ASKAP Continuum Survey
by Anumarlapudi et al.
Anumarlapudi et al. present the detection of 661 known pulsars observed with the Australian SKA Pathfinder (ASKAP) telescope at 888 MHz as a part of the Rapid ASKAP Continuum Survey (RACS). Detections were made through astrometric coincidence and the false detection rate is estimated to be ∼0.5%. Using archival data at 400 and 1400 MHz, they estimate the power law spectral indices for the pulsars in our sample and find that the mean spectral index is −1.8. However, they also find that a single power law is inadequate to model all the observed spectra. Using Stokes V measurements from the RACS data, they measured a circular polarization fraction of 9% for the sample and find that the mean polarization fraction is ∼ 10% (consistent between detections and upper limits).

The image above shows the spatial distribution of all the RACS sources that have a pulsar in the ATNF catalog within 10 arcseconds. Sky positions (in a Mollweide projection) of all the ATNF pulsars are shown as gray dots, the RACS Stokes I pulsar detections are shown as orange diamonds, and simultaneous RACS Stokes I and Stokes V detections are shown as blue stars. The black dashed line shows the declination limit, +41 degrees, for the RACS data release 1. The region within 5 degrees of the Galactic plane is shown by the green shaded region.

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