E.F. Keane1 and M.A. McLaughlin2
Abstract.
Over the past several years, it has become apparent that some radio
pulsars demonstrate significant variability in their single pulse
amplitude distributions. The Rotating Radio Transients (RRATs),
pulsars discovered through their single, isolated pulses, are one of
the more extreme manifestations of this variability. Nearly 70 of these
objects have been found over the past several years in archival
and new pulsar surveys. In this review, we describe these searches
and their resulting discoveries. We then discuss radio timing
algorithms and the spin-down properties of the 19 RRATs with
phase-connected solutions. The spin-down parameters fall within the same range
as other pulsars, with a tendency towards longer periods and higher magnetic fields.
Next we describe follow-up observations
at radio wavelengths. These show that there are
periodic fluctuations in the pulse
detection rates of some RRATs and that RRATs in general have similar spectra to other pulsars.
X-ray detection has only been made for one RRAT, J1819−1458;
observations have revealed absorption features and a bright X-ray nebula.
Finally, we look to future
telescopes and the progress that
will be made with these in characterising and understanding the
Galactic RRAT population.
Keywords: stars: neutron -- pulsars: general -- transients -- radio continuum: stars
1Max Planck Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2Department of Physics, West Virginia, University, Morgantown, WV 26506, USA