| 26th of October 2023 |
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| 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. |