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Radboud University > Faculty of Science > Department of Astrophysics

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news:pulsar_surveys_and_neutron-star_discoveries_--_timing_triples_vanishing_doubles_one-off_single_bursts [2015/09/16 11:41] (current)
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 +Pulsar surveys and neutron-star discoveries -- timing triples, vanishing doubles, one-off single bursts.
  
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 +Beyond the classical radio (millisecond) pulsars, which are relatively steady emitters, various kinds of transient neutron stars have been discovered in the last few years, such as bursts from rotating radio transients (RRATs), and the radio-emitting magnetars. The evolutionary links between these different populations of neutron stars is unclear. Discovering new radio pulsars over this variety of types is the primary goal of our pulsar surveys with the Green Bank, Arecibo and LOFAR radio telescopes. ​
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 +The GBT350 survey found the first pulsar triple system. The Arecibo PALFA survey discovered the relativistic young binary pulsar J1906+0746, which is quickly vanishing due to general relativistic effects. In LOTAAS, the LOFAR all northern-sky survey, we have now discovered the first set of new pulsars with LOFAR -- including a number by their one-off single bursts.
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 +Other single bright radio bursts appear, however, not to be formed by neutron stars, as they originate far outside our Galaxy. The nature of these extragalactic Fast Radio Bursts remains an outright mystery. Through its novel, extremely wide field-of-view,​ Aperif on Westerbork will detect many tens of extragalactic bursts. Through real-time triggers to LOFAR we will next provide the precise localization that is essential for radio, optical and high-energy follow-up to, for the first time, shed light on the physics and objects driving these bursts - evaporating primordial black holes; explosions in host galaxies; or, the unknown?